Copyright: ©1998 by Intermec Technologies Corporation, CD-ROM Part Number xxxxxxx Manual Part Number 067150-001


Contents
Repairing the Universal Access Point
Models 2100 and 2110 Part Number 068115-002  Click on a topic for more information. Basic Features   Troubleshooting  Removing and Replacing Parts  Spare Parts List and Exploded View  Specifications and Default Configurations  Theory of Operations  PCB Parts List and Schematics  For help using this online document, press F1.	21XX


PCB Parts
PCB Parts List and Schematics

  See Also

To order PCB parts and schematics, contact Intermec at:

Phone: 1-425-348-2600, extension 6685.

Email: records@intermec.com

Email from the internal Intermec network: Records - 600K Docs

Document	Document Title	Part Number
2100 Main PCB	PCB Assembly, Ethernet Controller	066446
2110 Main PCB	PCB Assembly, Wireless Access Point	067062


Basic Features

  See Also

The 21XX Universal Access Point (UAP) is an extended range, high performance, wireless local area network (LAN) product that serves as a bridge between your wireless network and your wired network. The UAP provides transparent communications between a wired LAN and wireless stations.

The Universal Access Point comes in two models. The features of each model are described below:

	2100 (UAP) The 2100 Universal Access Point attaches to a wired network (such as Ethernet) and provides wireless network access for wireless end devices within its area of coverage.  The 2100 has an Ethernet 10BaseT/10Base2 wired connector and supports operations as an access point or as a point-to-point wireless bridge, such as between two buildings.
	2110 (WAP) The 2110 Wireless Access Point (WAP) provides repeater capability and is useful in areas that do not support a wired connection to an access point. A WAP receives data from a wireless station and repeats it to an access point that is wired to the network. The 2110 does not have an Ethernet 10BaseT/10Base2 wired connector and only supports operation as a wireless access point (repeater).


Troubleshooting Table of Contents
Troubleshooting

Click on a topic below for more information about troubleshooting a specific problem.

  Understanding the LED Lighting Sequence

  Troubleshooting the Radios

  General Installation Guidelines

  Decreasing Interference

  Improving Transmission Range

  Frequently Asked Technical Support Questions


Understanding the LED Lighting Sequence

When you first power on the 21XX Universal Access Point, it performs internal diagnostics. The LEDs flash as the 21XX performs this self-test. The table below describes the status of each LED during the boot process.


Troubleshooting the Radios

If the radio card is faulty or the configuration matrix string is incorrect, the LEDs on the UAP display the following pattern after the UAP boots:

Wireless #1 	Wireless #2 	Wired LAN	Root/Error

Off	Off	On	On

If there is a radio problem and you are connected to the UAP through a serial connection, an error message appears on your PC. The error messages are described below. Radio A refers to the radio in slot 1, and radio B refers to the radio in slot 2. These error messages may appear for either radio A or radio B.

Error Message	Explanation

Couldn’t read country code from radio A	The radio may be faulty. Try reinstalling the radio card to make sure it is securely seated. If the error message reappears, try a new radio.
Radio A has unknown country code	The radio may have been configured incorrectly at the factory. Try reinstalling the radio card to make sure it is securely seated. If the error message reappears, try a new radio.
Invalid country code in string for radio A	The country code in the configuration matrix string does not match the country code in the radio in the UAP. Reconfigure the configuration matrix string.
Radio string doesn’t match radios installed.	Additional information is displayed. For example, “Expected 504,000 but found 491 in slot A, nothing in slot B.” Try reinstalling the radio card and reconfiguring the configuration matrix string. If the error message reappears, try a new radio.


General Installation Guidelines

Follow these general installation guidelines when installing UAPs:

♦	Locate 21XXs centrally within areas requiring coverage.

♦	Overlap 21XX coverage areas to avoid coverage holes.

♦	Try to position the 21XX so the LEDs are visible. The lights are useful for troubleshooting.

♦	Install wired LAN cabling within node limit and cable length limitations.

♦	An uninterruptable power supply is recommended when the AC power system is not reliable.


Decreasing Interference

Microwave ovens operate in the same frequency band as the 21XX with a 2.4 GHz OpenAir radio. Therefore, if you use a microwave within range of your Intermec RF network, you may notice network performance degradation. However, both your microwave and your RF network will continue to function. For optimal performance, consider locating your microwave oven out of range of your 21XX.

If you have a 900 MHz radio in your 21XX, you need to be aware that the 900 MHz radio may experience interference from cordless telephones operating in the same frequency. For optimal performance, consider operating 900 MHz cordless phones out of range of your 21XX.


Improving Transmission Range

Every environment is unique with different obstacles, barriers, materials, and so forth. Therefore, it is difficult to predetermine the exact range that you will achieve with your 21XX.

Radio signals may reflect off some obstacles and be absorbed by others, depending upon the composition of the obstacles. For example, two radios may achieve up to 1000 feet (305 meters) of range if positioned in open space outdoors within line of sight, with no obstacles between them. However, the same two units may only achieve up to 500 feet (152 meters) of range when the RF signal has to travel through items such as cubicles. If the signal must penetrate office walls, the signal range may decrease to 300 feet (91 meters).

Here are some guidelines for positioning your antenna:

♦	Place the antenna in a vertical position. It can be mounted upside down to the ceiling or a beam.

♦	Place the antenna as high as possible. In an office environment, try to place it above cubicle walls.

♦	Do not place metal obstacles (such as a filing cabinet) between two antennas.

♦	Two antennas that are communicating should be in the same plane. For example, do not place one antenna on its side and the other antenna upright.


Commonly Asked Technical Support Questions
Frequently Asked Technical Support Questions

Problem/Symptom/ Question	Possible Solution/Answer
Is the 21XX fully booted?	The Power LED remains steady green and the other LEDs flash when the 21XX is fully booted.
The Power LED is not on.	You may have a hardware problem with your 21XX. Unplug the 21XX and then plug it back in to cycle the power. Verify that the Power LED remains on.
I cannot configure the 21XX locally using the serial port.	1. Verify that you are using a null-modem cable to connect the 21XX to your terminal or PC. 2. Verify that the terminal or PC is set to 9600, N, 8, 1, no flow control, or that it is set to the same setting as the 21XX. Your system may be in autobaud mode. Reboot and press a key once per second until the signon screen appears.
I cannot ping or Telnet to my new 21XX.	The 21XX does not come with a default IP address. Before you can remotely connect to it, you must set an IP address and subnet mask using the serial port.
The end device (station) cannot connect to the network.	♦ Choose Analysis Tools from the Maintenance menu, and then choose UAP Connections. Verify that the MAC address of your end device displays on the screen. If the MAC address of your device does not appear, your device is not communicating with the 21XX. Check your radio configuration settings. –OR– ♦ Verify the 21XX is not filtering out the type of traffic you are trying to pass through it.
The end device (station) cannot synch to the 21XX.	The 21XX must be configured as a master and end devices must be configured as stations for the 21XX to operate properly. Verify that the end device and 21XX have the same domain and security ID.
My filters are not operating properly.	Check all of your filter settings. You may have conflicts between the various filters.
My throughput seems slow.	1. Verify that your antennas are well-placed, that they are not behind metal, and that there are few obstacles in their path.  2. If you move the antenna closer to the end device and throughput increases, try adding a second 21XX and implement roaming. 3. Try to set filters to filter out Ethernet traffic from the wireless side of the network.


Removing and Replacing Parts Table of Contents
Removing and Replacing Parts

Choose one of the following topics for instructions on repairing or replacing a specific piece of equipment.

Note: Make sure that you save all of the screws that you remove. You will need to reuse them when you install the new part.

	Before you replace any parts, make sure that you read about protecting electronic components. Whenever you see this icon at the beginning of a procedure, follow ESD procedures.
	Always remove metal jewelry and turn off power before removing the cover. Failure to comply may result in injury or death due to electric shock. Failure to comply may damage the equipment.
Antenna Cable Assembly	Antenna Cables	Clips (2100 only)
Removing an Antenna Cable Assembly   Replacing an Antenna Cable Assembly	Removing Antenna Cables                 Replacing Antenna                Cables	Removing the EMI Clip                      Replacing the EMI                      Clip
Controller Cable Assembly	Cover	Door Assembly
Removing the Controller Cable Assembly   Replacing the Controller Cable Assembly	Removing the Top Cover   Replacing the Top Cover	Removing the Door Assembly   Replacing the Door Assembly
DRAM Module	Dust Cap	Feet
Removing the DRAM Module   Replacing the DRAM Module	Removing the Dust Cap and Vinyl End   Replacing the Dust Cap and Vinyl End	Removing the Feet   Replacing the Feet
Gasket	Heater	LED Flex Assembly Cable
Removing the Gasket   Replacing the Gasket	Removing the Heater   Replacing the Heater	Removing the LED flex assembly cable   Replacing the LED flex assembly cable
Main PCB	Power Supply	Radios
Removing the Main PCB           Replacing the Main       PCB	Removing the Power Supply          Replacing the Power        Supply	Removing the Radio and Support Frame   Replacing the Radio and Support Frame


Removing Antenna
Removing an Antenna Cable Assembly

To remove an antenna cable assembly

1.	Remove the top cover and disconnect the LED flex assembly cable.

2.	Remove the gasket, and then remove the heater, if there is one.

3.	Use a wrench to remove the nut and lock washer on the antenna cable assembly. Retain the nut and lock washer.

4.	Slide the antenna cable assembly out of the hole in the bottom cover.

5.	Disconnect the antenna cable assembly from the radio.

♦	If the UAP has a 2.4 GHz OpenAir radio, disconnect the antenna cable assembly from the radio by carefully lifting straight up on the antenna cable assembly connector that is attached to the radio.

♦	If the UAP has a 900 MHz radio, you must remove the 900 MHz radio and radio support before you can disconnect the antenna cable assembly from the radio.


Replacing Antenna
Replacing an Antenna Cable Assembly

To replace an antenna cable assembly

1.	Attach the antenna cable assembly to the radio by gently pressing the antenna connector into the antenna socket on the radio.

2.	Align the flat side on the antenna cable assembly with the flattened side of the appropriate hole in the bottom cover.

3.	Insert the antenna cable assembly as far as it will go through the hole.

4.	Insert the lock washer and nut onto the antenna cable assembly from the outside of the bottom cover.

5.	Use a wrench to tighten the nut.

6.	Reconnect the LED flex assembly cable and reinstall the top cover.


Antenna Cable Assembly, 900 MHz	068558
Antenna Cable Assembly, 2.4 GHz OpenAir	060754


Removing Antenna Cables

To remove an antenna cable

♦	Turn the antenna cable connector counterclockwise to unscrew it from the antenna cable assembly on the access point.


Replacing Antenna Cables

To replace an antenna cable

♦	Turn the antenna cable connector clockwise to screw the antenna cable onto the antenna cable assembly on the access point.


21XX Adapter Cable to Cable	067266
21XX Adapter Cable to Antenna	067265
Cable 2.5' (76 cm)	064616
Cable 5' (152 cm)	063245
Cable 20' (610 cm)	063246


Removing the Controller Cable Assembly

To remove the controller cable assembly

1.	Remove the top cover, and disconnect the LED flex assembly cable.

2.	Remove the gasket, and then remove the heater (if there is one).

3.	Unscrew the two screws connecting the power supply to the access point (see detail 1 below), and retain them.

4.	Disconnect the 6-pin connector on the end of the controller cable assembly from the main PCB (see 2 below) and remove the power supply from the bottom of the case.

5.	Disconnect the other end of the controller cable assembly from the power supply PCB inside the power supply.

Note: You might have to use a screwdriver to pry the cable holder away from the cable so you can pull the cable out.

6.	Clip the cable tie that attaches the controller cable assembly to the power supply.


Replacing the Cable Assembly Controller
Replacing the Controller Cable Assembly

To replace the controller cable assembly

1.	Reconnect the controller cable assembly to the power supply PCB.

2.	Secure the controller cable assembly to the power supply using a cable tie.

3.	Reinstall the power supply in the bottom of the access point, using the two screws you retained earlier. (See detail 1 below.)

4.	Reconnect the 6-pin connector on the controller cable assembly to the main PCB. (See detail 2 below.)

5.	Reinstall the heater if there is one, and then reinstall the gasket.

6.	Reconnect the LED flex assembly cable and then reinstall the top cover.


Controller Cable Assembly	065163
Cable Ties	590305


Removing the Door Assembly

To remove the door assembly

1.	Unscrew the two screws that hold the door in place.

2.	Remove the door.


 Replacing the Door Assembly

You should install the door after you install the top cover.

To replace the door assembly

1.	Position the door in alignment with the threaded bosses on the bottom cover.

2.	Hand-tighten the two screws.


Door Assembly, Spare	065195S


Removing the DRAM Module

To remove the DRAM module

1.	Remove the top cover and disconnect the LED flex assembly cable.

2.	Unclip the DRAM module from the SIMM socket.

3.	Remove the DRAM module from its holder.


Replacing the DRAM Module

To replace the DRAM module

1.	Insert the DRAM module into the SIMM socket so its chips face the cable access panel of the access point.

2.	Push the DRAM module in until it locks into position.

Note: You will know that the module is in place because you will hear a clicking noise.

3.	Reconnect the LED flex assembly cable and reinstall the top cover.


DRAM Module	590341S


Removing the Dust Cap

Your access point contains several dust caps that cover the unused ports. You can have a serial port dust cap, and/or a 10BaseT or 10Base2 Ethernet dust cap, depending upon the ports not being used. Remove the dust cap from the port that you want to use, and reinstall the dust caps on ports no longer in use.

To remove a dust cap

1.	Loosen the two screws and remove the cable access door.

2.	Pull off the dust cap for the port you want uncovered, and retain the dust cap.

See the following graphic for a list of each port.


Replacing the Dust Cap

Your access point contains several dust caps that cover the unused ports. You can have a serial port dust cap, and/or a 10BaseT or 10Base2 Ethernet dust cap, depending upon the ports not being used. Remove the dust cap from the port that you want to use, and reinstall the dust caps on ports no longer in use.

To replace the dust cap

1.	Loosen the two screws and remove the cable access door.

2.	Insert the dust cap on its appropriate port opening.

3.	Reinstall the cable access door.

See the following graphic for a list of each port.


Dust Cap DB9 (Serial port)	501525
Dust Cap Vinyl End BNC (10Base2 Ethernet)	590559
Dust Cap RJ45 (10BaseT Ethernet)	590596


Removing the EMI Clip

Note: This procedure only applies to the 2100 Universal Access Point. The 2110 Wireless Access Point does not have an EMI clip.

To remove the EMI clip

1.	Remove the top cover and disconnect the LED flex assembly cable.

2.	If your access point has a heater, remove the heater.

3.	Turn the access point so that the cable connectors face you.

4.	Loosen the nut on the 10Base2 Ethernet port.

5.	Locate the EMI clip between the Ethernet plate and the 10Base2 Ethernet port. (See detail 1 below).

6.	Press the clip towards the Ethernet plate and slide it up to remove it.


Replacing the EMI Clip

Note: This procedure only applies to the 2100 Universal Access Point. The 2110 Wireless Access Point does not have an EMI clip.

To replace the EMI clip

1.	Place the clip on the inside of the Ethernet plate, between the Ethernet plate and the 10Base2 port. Make sure the bent side is angled away from the Ethernet plate. (See detail 1 below.)

2.	Tighten the nut on the outside of the 10Base2 port.

3.	Replace the heater (if you removed it earlier).

4.	Reconnect the LED flex assembly cable and reinstall the top cover.


Clip, EMI	067399


Removing the Gasket

To remove a gasket

1.	Remove the top cover.

2.	Disconnect the LED flex assembly cable.

3.	Lift the gasket off the bottom cover.


Replacing the Gasket

Note: The gasket is not symmetrical and must be placed correctly on the bottom cover.

To replace a gasket

1.	Place the gasket along the edge of the bottom cover.

2.	Reconnect the LED flex assembly cable.

3.	Reinstall the top cover.


Gasket, Frame Cover, Spare	065194S


Removing the Heater

Note: If you are installing a heater for the first time, you need to remove and replace the existing power supply.

To remove the existing heater and power supply

1.	Remove the top cover.

2.	Disconnect the LED flex assembly cable.

3.	Remove the gasket.

4.	Remove the two screws that secure the heater to the UAP. Retain the screws.

5.	Lift the heater out of the UAP and disconnect the heater power cable from the power supply. (Skip this step if installing the heater for the first time.)

6.	Remove the two screws that secure the power supply to the UAP. Retain the screws.

7.	Lift the power supply up, and then disconnect the power supply from the main PCB.


Replacing the Heater

To replace the heater and power supply

1.	Position the power supply in the bottom cover of the UAP. Make sure the attached heater does not strike the main PCB.

2.	Secure the power supply to the UAP using the two screws you retained earlier.

3.	Plug the power supply cable into the main PCB.

4.	Plug the heater power cable into the power supply.

5.	Secure the heater to the UAP using the two screws you retained earlier.

6.	Reinstall the gasket.

7.	Reconnect the LED flex assembly cable.

8.	Reinstall the top cover.


Heater, 120V	066425
Heater, 240V	066426


Removing the Feet

The access point comes with a set of four rubber feet. If these feet become damaged or worn, they should be replaced.

To remove worn feet

1.	Turn the access point upside down, so that it rests on its top cover.

2.	Use a screwdriver to pry up each of the rubber feet (see detail 1 below).

3.	Remove any adhesive residue remaining where the feet were located.


Replacing the Feet

To add new feet to the bottom of the access point

1.	Make sure that the places where the new feet are to be installed are clean and free from moisture.

2.	Peel the adhesive backing from each foot, and place it on the access point (see detail 1 below).

3.	When you are satisfied with the placement of each foot, press it down firmly.


Feet, Rubber (4)	523300


Removing the LED Flex Assembly Cable

The LED flex assembly cable is attached to the top cover with adhesive and can be difficult to remove.

To remove the LED flex assembly cable

1.	Remove the top cover.

2.	Disconnect the LED flex assembly cable from the main PCB.

3.	Turn the top cover upside down and position it so that the front panel is facing you.

4.	Use a screwdriver to pry the LED panel off of the top cover.

5.	Remove any adhesive residue that remains on the top cover.


Replacing the LED Flex Assembly Cable

To replace the LED flex assembly cable

1.	Place the top cover upside down, with the Intermec logo facing you.

2.	Make sure the area in the top cover where the LED panel will be installed is clean and dry.

3.	Peel the backing off the new LED panel.

4.	Position the LED panel on the top cover so that all the LEDs are centered in holes. Press down firmly on the LED panel.

Note: The LED flex assembly cable should point up, away from the top of the top cover.

5.	Reconnect the LED flex assembly cable.

6.	Reinstall the top cover.


PCB Assembly, LED Spare	066784S


Removing the Main PCB

To remove the main PCB

1.	Remove the top cover and disconnect the LED flex assembly cable.

2.	Remove the gasket, and then remove the heater if one is installed.

3.	Use the screwdriver to remove the radios and radio supports from the main PCB. Save the radios, screws, and radio supports.

4.	Use the nut driver to remove the two jack screws that secure the serial port connector to the assembly housing. Save the jack screws.

5.	Use the socket wrench to loosen the nut that secures the 10Base2 Ethernet port in place. Save the nut.

6.	Use the screwdriver to remove the four screws that secure the main PCB to the UAP (see 2 below), and lift the main PCB (see detail 1 below) out of the access point housing. Save the screws.

7.	Remove the DRAM module from the main PCB and place the DRAM module in the new main PCB.


Replacing the Main PCB

To replace the main PCB

1.	Insert the main PCB into the bottom cover (see detail 1 below) so that the serial port and antenna fit in the appropriate slots.

2.	Secure the serial port connector to the bottom cover using the jack screws you saved earlier. (See detail 3 below.) Use the nut driver to tighten the jack screws.

3.	If there is an EMI clip, be sure it is positioned properly. Use a socket wrench to tighten the nut on the 10Base2 Ethernet port.

4.	Reinstall the four screws that hold the main PCB in place. (See detail 2 below.)

5.	Reinstall the radio, power supply, heater, and gasket.

6.	Reconnect the LED flex assembly cable, and then reinstall the top cover.


PCB Assembly, Ethernet Controller Spare	066446S
PCB Assembly, Wireless Access Point Spare	067062S


Removing the Power Supply

To remove the power supply

1.	Remove the top cover, and disconnect the LED flex assembly cable.

2.	Remove the gasket and then remove the heater, if your access point has one.

3.	Unscrew the two screws connecting the power supply to the access point, and retain them.

4.	Disconnect the power supply cable from the main PCB.

5.	Remove the power supply.


Replacing the Power Supply

To replace the power supply

1.	Insert the power supply in the bottom cover of the access point. Align the mounting holes in the power supply with the mounting holes in the access point cover.

2.	Use the two screws you retained earlier to secure the power supply to the access point.

3.	Reconnect the power supply cable to the main PCB.

4.	Reinstall the heater, if there is one.

5.	Reinstall the gasket.

6.	Reconnect the LED flex assembly cable, and then reinstall the top cover.


Power Module, Spare	065170S


Removing the Radio

Note: If you are upgrading the UAP to a different type of radio, make sure these firmware versions are installed on the UAP before you remove and replace the radio:

♦	UAP Monitor boot code version 2.02 or greater

♦	UAP Program code version 2.73 or greater

If you are upgrading to a different type of radio, note the current configuration settings before you remove the radio.

To remove a 900 MHz radio

1.	Remove the top cover and disconnect the LED flex assembly cable.

2.	Remove the gasket. Remove the heater, if there is one.

3.	Remove the antenna cable assembly.

4.	Use a screwdriver to remove the screw that secures the radio support to the bottom cover.

5.	Remove the radio support. (See detail 1 below.)

6.	Slide the radio away from the main PCB until it is detached from the PC card socket. Lift out the radio and antenna cable assembly.

7.	Disconnect the antenna wire from the radio by gently lifting the antenna connector straight up from the radio.

To remove a 2.4 GHz OpenAir radio

1.	Remove the top cover and disconnect the LED flex assembly cable.

2.	Remove the gasket. Remove the heater, if there is one.

3.	Disconnect the antenna wire from the radio by gently lifting the antenna connector straight up from the radio.

4.	Use a screwdriver to remove the two screws that secure the radio to the radio support. (See detail 2 below.)

5.	Gently wiggle the radio until it comes loose from the mini-ISA socket on the main PCB.

6.	Lift out the radio.

7.	If you will be installing a different kind of radio, you also need to remove the radio support and antenna cable assembly.

8.	Use a screwdriver to remove the screw in the radio support.

9.	Remove the radio support.


Replacing the Radio

Note: If you are upgrading the UAP to a different type of radio, make sure these firmware versions are installed on the UAP before you remove and replace the radio:

♦	UAP Monitor boot code version 2.02 or greater

♦	UAP Program code version 2.73 or greater

The UAP has two radio slots. You can install either type of radio in either slot; however, Intermec recommends that if you only have one radio, you install it in slot 1. The radio slots 1 and 2 are identified here.

To replace a 2.4 GHz OpenAir radio

1.	Insert the radio support into one of the radio slots in the access point. (See detail 2 below.)

2.	Secure the radio support to the access point using the thread-forming screw included in the radio kit.

3.	Press the mini-ISA connector on the radio into the mini-ISA socket on the main PCB until the radio is firmly seated.

4.	Secure the radio to the radio support using the two screws in the radio kit.

5.	Attach the antenna cable assembly to the radio by gently pressing the wire end of the antenna cable assembly into the antenna socket on the radio.

6.	Install the antenna cable assembly, if necessary.

7.	Reinstall the heater (if necessary) and gasket. Reconnect the LED flex assembly cable and then reinstall the top cover.

8.	Apply the radio certification label to the back of the UAP, below the existing radio certification labels. Do not cover up any existing labels.

9.	If you are upgrading the UAP with a different type radio, you must also:

♦	Apply the appropriate radio replacement label in the blank space on the radio certification label that you just applied to the UAP.

♦	Reconfigure the configuration matrix string.

To replace a 900 MHz radio

1.	Attach the antenna cable assembly to the radio by pressing the wire end of the antenna cable assembly into the antenna socket on the radio.

2.	Slide the radio into the PC card socket in the main PCB. (See detail 1 below.)

3.	Insert the radio support and secure it using the thread-forming screw contained in the radio kit.

4.	Install the antenna cable assembly.

5.	Reinstall the heater (if necessary) and gasket. Reconnect the LED flex assembly cable and then reinstall the top cover.

6.	Apply the radio certification label to the back of the UAP, below the existing radio certification labels. Do not cover up any existing labels.

7.	If you are upgrading the UAP with a different type radio, you must also:

♦	Apply the appropriate radio replacement label in the blank space on the radio certification label that you just applied to the UAP.

♦	Reconfigure the configuration matrix string.


Radio Module, 2.4 GHz CC 2,6 Spare	067204S
Radio Module, 2.4 GHz CC 0,1 Spare	066787S
Radio Module, 2.4 GHz CC 0,1 Exchange	066787E
Radio Module, 2.4 GHz CC 2,0 Spare	067206S
Radio Module, 2.4 GHz CC 1,51 Spare	067207S
Radio Module, 2.4 GHz CC 1,1 Spare	067205S
Radio Module, 2.4 GHz CC 1,25 Spare	068208S
Radio Module, 2.4 GHz CC 1,48 Spare	067403S
Radio Module, 2.4 GHz CC 1,14 Spare	067404S
Radio Module, 2.4 GHz CC 1,71 Spare	069148S
Radio Module, 900 MHz, US, Spare	068583S
Radio Module, 900 MHz, Australia, Spare	068406S
Radio Support Frame, 2.4 GHz	066585
Radio Support Frame, 900 MHz	068561


Upgrading Firmware

To upgrade the UAP firmware

1.	Download the latest UAP firmware to a PC by accessing the Intermec Product Support Firmware/Software Index (FSI) at this location:

♦	www.intermec.com/regions/general/prod_sup/fw/2100fw.htm

2.	Follow the instructions in the readme.txt to load the firmware onto the UAP.


Reconfiguring the Configuration Matrix String

If you upgraded the UAP to a different type radio, you must reconfigure the configuration matrix string. The format of the configuration matrix string is:

xxxxxxx111222

where:

xxxxxxx  identifies the model of the UAP

111         identifies the radio in slot 1

222         identifies the radio in slot 2

To determine the new configuration matrix string

1.	Note the first 7 characters in the original configuration matrix string—this is the 13-character string that appears after the characters C/N on the original radio certification label on the back of the UAP.

2.	Identify the radio in slot 1.

♦	If the original radio remains in slot 1, use the 3 digits for the radio in slot 1 from the original string.

♦	If you installed a radio in slot 1, use the last 3 digits from the model number listed on the new radio replacement label.

♦	If there is no radio in slot 1, use 000.

3.	Identify the radio in slot 2.

♦	If the original radio remains in slot 2, use the 3 digits for the radio in slot 2 from the original string.

♦	If you installed a radio in slot 2, use the last 3 digits from the model number listed on the new radio replacement label.

♦	If there is no radio in slot 2, use 000.

To reconfigure the configuration matrix string

1.	Use an RS-232 null-modem cable to connect the UAP to a terminal or PC.

2.	Plug the power cable into a power source. The UAP immediately boots.

3.	Enter the UAP Monitor by pressing a key on the keyboard when the following message appears:

  <Press any key within 5 seconds to enter the UAP monitor>

  The UAP prompt (uap>) appears.

4.	Type zmt at the UAP prompt to enter the matrix menu.

5.	Type the matrix password and press Enter. The password is matrix (lowercase).

6.	Change the configuration matrix string using the ma command. The format is:

 ma xxxxxxx111222

  After you enter a valid configuration matrix string, the confirmation message “passed” appears on the screen.

7.	Type x to exit the matrix menu.

8.	To verify your configuration matrix string, type mr at the UAP prompt. The manufacturing record displays on the screen, which includes the configuration matrix string.

9.	Type b to reboot the UAP.

To complete the radio upgrade

1.	Restore the UAP defaults.

2.	Save the default configuration.

3.	Reboot the UAP.

4.	Reconfigure the UAP for this installation.


Removing the Top Cover

To remove the top cover

1.	Remove the door assembly.

2.	Disconnect the power cable, Ethernet cables (if applicable), and serial port cables from the access point.

3.	Use a screwdriver to unscrew the seven screws holding the top in place. Retain the screws.

4.	Turn the access point over so that it rests on its feet, and then lift up on the top to open the access point partway.

5.	Disconnect the LED flex assembly cable from the main PCB.

6.	Remove the top cover completely.

If replacing the top cover with a new cover, see removing and replacing the LED flex assembly cable procedures as well.


Replacing the Top Cover

Note: If you are replacing the old top cover with a new one, you should also see removing and replacing the LED flex assembly cable procedures before continuing.

To replace the top cover

1.	Position the gasket along the edge of the bottom cover.

2.	Connect the LED flex assembly cable to the main PCB.

Note: If you have a heater, the LED flex assembly cable should be placed on top of the plastic shield for safety.

3.	Carefully position the top cover on the bottom cover.

4.	Turn the UAP over so it rests on its top cover.

5.	Visually inspect the UAP to make sure the gasket is in place.

6.	By hand, start the seven screws you retained earlier.

7.	Use 18 in-lb of torque to tighten the screws, following the torque sequence shown below.

8.	Reconnect the power port, Ethernet cables (if applicable), and serial port cables.

9.	Replace the door assembly.

Follow the torque sequence shown here.


Cover, Top Spare 2100	065193S
Cover, Top Spare 2110	069105S


♦	Phillips Screwdriver


♦	Screwdriver


♦	3/32 Screwdriver

♦	1/4 Screwdriver


♦	3/16 inch Nut Driver

♦	Deep-seated Socket Wrench

♦	Phillips Screwdriver


♦	5/8 inch (16 mm) Open-ended Socket Wrench

♦	Phillips Screwdriver


♦	Calibrated torque screwdriver


Protecting Electronic Components

As Intermec moves to surface mount technology and smaller components, our products become more vulnerable to damage from electrostatic discharge (ESD). Recently Intermec experienced spare board assembly failures in the field that were traced to improper ESD protection while handling or installing the boards. These failures are costly and can be easily avoided.

Intermec's Service department recommends that all field personnel follow three guidelines to prevent ESD damage:

♦	Before you open any Intermec product, place that product on an ESD mat and ground the product.

♦	Use an ESD mat and wrist strap when repairing and replacing printed circuit boards.

♦	Follow all standard ESD procedures for your workplace.

	Follow ESD Procedures This icon appears at the beginning of any procedure in this manual that could cause you to touch components (such as printed circuit boards) that are susceptible to damage from electrostatic discharge (ESD). When you see this icon, you must follow standard ESD guidelines to avoid damaging the equipment you are servicing.
Intermec’s Everett facility uses several vendors for ESD products. One USA vendor is DESCO Industries, Inc., which you can reach either on the World Wide Web at http://www.desco.com/ or by telephone at 1.909.598.2753.


Spare Parts List and Exploded View Table of Contents
Spare Parts List and Exploded View

Click to access a specific spare parts list and exploded view, or click on “Complete List of Spare Parts” to view a list of every spare part on the Universal Access Point.

 Antenna Cable Assembly

 EMI Clip and DRAM Module

 Feet

 Gasket

 Heater Assembly

 Main PCB

 Power Supply

 Radio and Support Frame

 Complete List of Spare Parts


Complete List of Spare Parts

The following is a list of every spare part associated with the 21XX.

1.	21XX Adapter Cable to Antenna	067265
2.	21XX Adapter Cable to Cable	067266
3.	Adhesive Sealing Strip	066786
4.	Antenna Cable Assembly, 2.4 GHz OpenAir	060754
5.	Antenna Cable Assembly, 900 MHz	068558
6.	Antenna Label	066788
7.	Antenna, 2.4  3dbi Omni	063363
8.	Antenna, 2.4  5dbi Dual Flat	067262
9.	Antenna, 2.4  9dbi Omni	065349
10.	Antenna, 2.4  9dbi Plat Panel	067263
11.	Antenna, 2.4  Omni	066147
12.	Antenna, 2.4 3dbi mini Omni	067261
13.	Controller Cable Assembly	065163
14.	Cable Ties	590305
15.	Cable 2.5' (76 cm)	064616
16.	Cable 20' (610 cm)	063246
17.	Cable 5' (152 cm)	063245
18.	Clip, EMI	067399
19.	Cover, Top Spare 2100	065193S
20.	Cover, Top Spare 2110	069105S
21.	Door Assembly, Spare	065195S
22.	DRAM Module	590341S
23.	Dust Cap DB9	501525
24.	Dust Cap Vinyl End BNC	590559
25.	Dust Cap RJ45	590596
26.	Feet, Rubber (4)	523300
27.	Gasket, Frame Cover, Spare	065194S
28.	Heater, 110V	066425
29.	Heater, 240V	066426
30.	Lightening Suppressor & Bracket	061868
31.	Lightening Suppressor Capsule	586610
32.	LMR400 Cable Prep Tool	589377
33.	LMR400 Cable 100' (3,040 cm)	064432
34.	PCB Assembly, Ethernet Controller Spare	066446S
35.	PCB Assembly, LED Spare	066784S
36.	PCB Assembly, Wireless Access Point Spare	067062S
37.	Power Module, Spare	065170S
38.	Radio Module, 2.4 GHz CC 2,6 Spare	067204S
39.	Radio Module, 2.4 GHz CC 0,1 Spare	066787S
40.	Radio Module, 2.4 GHz CC 0,1 Exchange	066787E
41.	Radio Module, 2.4 GHz CC 2,0 Spare	067206S
42.	Radio Module, 2.4 GHz CC 1,51 Spare	067207S
43.	Radio Module, 2.4 GHz CC 1,1 Spare	067205S
44.	Radio Module, 2.4 GHz CC 1,25 Spare	068208S
45.	Radio Module, 2.4 GHz CC 1,48 Spare	067403S
46.	Radio Module, 2.4 GHz CC 1,14 Spare	067404S
47.	Radio Module, 2.4 GHz CC 1,71 Spare	069148S
48.	Radio Module, 900, US, Spare	068583S
49.	Radio Module, 900, AUSTRALIA, Spare	068406S
50.	Radio Support Frame, 2.4 GHz OpenAir	066585
51.	Radio Support Frame, 900 MHz	068561
52.	Splitter	063198
53.	Type N Cable Connector	063146
54.	Type N Polarized Cable Connector	061475


Power Supply

Spare Parts

1.	Screws	N/A
2.	Power Supply, Spare	065170S
	Cable Ties	590305


EMI Clip and DRAM Module Spares View

Spare Parts

1.	EMI Clip	067399
2.	DRAM Module	590341S
	Lock washer for Antenna Assembly	N/A
	Nut for Antenna Assembly	N/A


Heater Assembly Spare Parts

Spare Parts

1.	Heater, 110V  Heater, 240V	066425 066426
2.	Screws	N/A


Main PCB Spares View

Spare Parts

1.	PCB Assembly, Ethernet Controller Spare PCB Assembly, Wireless Access Point Spare	066446S 067062S
2.	Screws	N/A


Radio and Support Frame Spares View

Spare Parts

1.	Radio Module, 900 MHz, US, Spare Radio Module, 900 MHz, Australia, Spare	068583S 068406S
2.	Radio Module, 2.4 GHz CC 2,6 Spare	067204S
	Radio Module, 2.4 GHz CC 0,1 Spare	066787S
	Radio Module, 2.4 GHz CC 0,1 Exchange	066787E
	Radio Module, 2.4 GHz CC 2,0 Spare	067206S
	Radio Module, 2.4 GHz CC 1,51 Spare	067207S
	Radio Module, 2.4 GHz CC 1,1 Spare	067205S
	Radio Module, 2.4 GHz CC 1,25 Spare	068208S
	Radio Module, 2.4 GHz CC 1,48 Spare	067403S
	Radio Module, 2.4 GHz CC 1,14 Spare	067404S
	Radio Module, 2.4 GHz CC 1,71 Spare	069148S
	Radio Support Frame, 2.4 GHz OpenAir  Radio Support Frame, 900 MHz	066585 068561


Antenna Assembly Spares View

Spare Parts

	Antenna Cable Assembly, 900 MHz Antenna Cable Assembly, 2.4 GHz OpenAir	068558 060754


Feet Spares View

Spare Parts

1.	Feet, Rubber (4)	523300


Gasket Spares View

Spare Parts

1.	Gasket, Frame Cover, Spare	065194S


Specifications and Default Configurations Table of Contents
Specifications and Default Configurations

Click a topic below to access the specifications and default configurations for the 21XX Universal Access Point. To print a topic, right-click on the topic, and then click Print.

   Radio Specifications - 900 MHz

   Radio Specifications - 2.4 GHz OpenAir

Physical Specifications

Other Specifications

Default Settings

Quick Start Menu Defaults


Radio Specifications - 2.4 GHz OpenAir

Parameter	Description
Data rate	1.6 Mbps (Wireless)
Domains	16
Channels	15
Range  (standard antenna)	Up to 500 ft (150 m) indoors Up to 1000 ft (300 m) outdoors Unlimited with roaming
Frequency band	2.4 to 2.5 GHz world-wide (varies by country)
Radio type	Frequency hopping, spread spectrum
Radio power output	500 mW  100 mW (Europe)


Physical Specifications

Temperature	Range
Operating
Standard Unit	0°C to +50°C  (+32°F to +122°F)
Heater Module (optional)	-20°C to +50°C (-4°F to +122°F)
Heater with Bag (optional)	-30°C to +0°C (-22°F to +32°F)
Storage
Range for all units	-40°C to +70°C (-40°F to +158°F)
Humidity  (non-condensing)	10 to 90%
Electrical	∼100 to 240V 1.0 to 0.5A 50 to 60 Hz
Weight	6 lb. (2.7 kg)
Size	Height: 3.8 in (97 mm)  Length: 14.00 in (355 mm) Width: 9.3 in (234 mm)


Other Specifications

Parameter	Description
Architecture	Transparent bridge
Ethernet interfaces	10Base2 (thin coaxial BNC) 10BaseT (twisted-pair)
Data rate	10 Mbps (Ethernet)
Media Access protocol	CSMA/CA
Ethernet compatibility	Ethernet packet types and Ethernet addressing
Filtering rate	14,880 frames per second
Filters (protocol)	AppleTalk, NetBEUI, IPX, IP, DECNET, Other
Filters (others)	IP ARP, Novell RIP, SAP, LSP
Serial port max data rate	115,200 bps
Management access (Telnet, Web browser)	Intermec wireless LAN, serial, Ethernet
Software upgrades	Downloadable over the network or serial port
SNMP agent	Version 1 RFC 1213
ETSI Testing	For purposes of ETS 300 328 type testing, the access point was tested over a temperature range of -4°F to 131°F (-20°C to 55°C).


Default Settings

The factory default settings for the UAP are listed in tables you can access by clicking on a topic below. To print a topic, right-click on the topic, and then click Print.

Quick Start Menu Defaults

Ethernet Port Configuration Menu Defaults

OpenAir Port Configuration Menu Defaults

900 MHz Port Configuration Menu Defaults

INCA/IP Port Configuration Menu Defaults

Network Configuration Menu Defaults

Bridge Configuration Menu Defaults

Maintenance Menu Defaults


Quick Start Menu Defaults

Parameter Name	Range	Default
IP Address	4 nodes, 0 to 255	0.0.0.0
IP Subnet Mask	4 nodes, 0 to 255	255.255.255.0
LAN ID	0 to 254	0
AP Name	0 to 16 characters	(device serial number)


Ethernet Port Configuration Menu Defaults

Parameter Name	Range	Default
Port Control	Enabled/Disabled	Enabled
Hello Period	1, 2, or 3 seconds	2
INCA Frame Type	DIX/SNAP	DIX


OpenAir Port Configuration Menu Defaults
2.4 GHz OpenAir Port Configuration Menu Defaults

Parameter Name	Range	Default
Port Control	Enabled/Disabled	Enabled
Hello Period	1, 2, or 3 seconds	2
Master Configuration     Channel     Subchannel     Wireless Hops	1 to 15 1 to 15 Disabled/Enabled	1 1 Disabled
2.4 GHz OpenAir-A Node Type Channel Subchannel Wireless Hops	Master/Station 1 to 15 1 to 15 Disabled/Enabled	Master 1 1 Disabled
2.4 GHz OpenAir-B Node Type Channel Subchannel Wireless Hops	Master/Station 1 to 15 1 to 15 N/A	Station 9 9 N/A
MAC Configuration	Default/Manual/ Interference/ Throughput	Default
Manual MAC parms     Hop Period     Beacon Frequency     Deferral Slot     Fairness Slot     Fragment Size     Transmit Mode     Norm Ack Retry     Frag Ack Retry     Norm QFSK Retry     Frag QFSK Retry	100/200/400 ms 1 to 7 Default/1/3/7 Default/1/3/7 1 to 1540 AUTO/BFSK/QFSK 1 to 255 1 to 255 1 to 255 1 to 255	200 ms 2 Default Default 310 AUTO 255 255 255 255


INCA/IP Port Configuration Menu Defaults

Parameter Name	Range	Default
Port Control	Enabled/Disabled	Enabled
Hello Period	1, 2, or 3 seconds	2
Mode	Originate If Root/Listen	Listen
IGMP	Enabled/Disabled	Disabled


Network Configuration Menu Defaults

Parameter Name	Range	Default
IP Address	4 nodes, 0 to 255	0.0.0.0
IP Subnet Mask	4 nodes, 0 to 255	255.255.255.0
IP Router	4 nodes, 0 to 255	0.0.0.0
IP Frame Type	DIX/SNAP	DIX
DHCP	Enabled/Disabled/Enabled (if 0)	Enabled (if IP Address=0)
DHCP Server Name	31 characters	(blank)
Auto ARP Minutes	0 to 120	5


Bridge Configuration Menu Defaults

Parameter Name	Range	Default
LAN ID	0 to 254	0
Root Priority	0 to 7	1
Ethernet Bridging	Disabled/Enabled	Enabled
Secondary LAN Bridge Priority	0 to 7	0
Secondary LAN Flooding	Disabled/Enabled/ Multicast/Unicast	Disabled
Global Flooding
ARP Server Mode
Global RF Parameters


Maintenance Menu Defaults

Parameter Name	Range	Default
Password	16 characters	Intermec
Service Password	Enabled/Disabled	Enabled


Global Flooding

Parameter Name	Range	Default
Global Flooding Multicast Flood Mode	Hierarchical/Universal/ Disabled	Hierarchical
Outbound to Terminals Outbound to Secondary LANs	Disabled/Enabled Set locally/Enabled	Enabled Set locally
Unicast Flood Mode Outbound to Terminals Outbound to Secondary LANs	Hierarchical/Universal/ Disabled Disabled/Enabled Set locally/Enabled	Disabled Disabled Set locally


ARP Server Mode

Parameter Name	Range	Default
ARP Server Mode	Disabled/ No Flooding/Normal Flooding	Disabled


Global RF Parameters

Parameter Name	Range	Default
400 MHz UHF Rfp Threshold  Set Globally Value 400 MHz UHF Frag Size Set Globally Value 900 MHz Frag Size Set Globally Value 400 MHz UHF/900 MHz Awake time Set Globally Value	Enabled/Disabled 0 to 250 Enabled/Disabled 0 to 250 Enabled/Disabled 0 to 250 Enabled/Disabled 0 to 250	Disabled 70 Disabled 250 Disabled 250 Disabled 0


900 MHz Port Configuration Menu Defaults

Parameter Name	Range	Default
Port Control	Enabled/Disabled	Enabled
Hello Period	1, 2, or 3 seconds	1
Software Driver File Name	None	falcon_d.bin


Radio Specifications - 900 MHz

Parameter	Description
Data rate	90, 225, or 450 Kbps (depends on installation)
Channels	7 @ 90 Kbps, 1 @ 225 or 450 Kbps
Range  (standard antenna)	Up to 1300 feet (396 meters) line of sight
Coverage	100,000 to 350,000 square feet (9,290 to 32,515 square meters)
Frequency band	902 to 928 MHz
Radio type	Direct sequence, spread spectrum
Radio power output	250 mW


Theory of Operations Table of Contents
Theory of Operations

Click on any of the following topics to read about the theory of operations for the Universal or Wireless Access Point device.

Overview	DRAM	PCMCIA Ports
Introduction	Ethernet Port	Power Circuitry
+3.3 volt Supply	Flash Memory	Power Supply
10Base2 (BNC)	LED Flex PCB	Radio Module
10BaseT (RJ45)	Main PCB	Reset Circuitry
AC Input Module	Memory Map	RS-232 Port
BDM Port	Microcontroller	Status LED Logic
Clock Circuitry	Mini-ISA Ports


Introduction

The 2100 Universal Access Point (UAP) and 2110 Wireless Access Point (WAP) provide the means of transferring (bridging) data packets between a wired Ethernet network and a wireless RF network. The RF network side of the 21XX can be configured to be compatible with many RF networks simply by installing the appropriate radio into the PCMCIA or “Mini-ISA” slot. It is even possible to install two radios. Also the operating temperature range of the 21XX can be extended with either the heater option or the soon to be available heater/cooler option.

The 2110 Wireless Access Point (WAP) functions in the same manner as the 2100 with the exception that it is a bridging (repeating) device only, and does not contain a wired Ethernet port.

Both access points are considered “universal” because they can easily accommodate a variety of radios and network topologies.


Overview

The 21XX was designed to be powerful yet simple to build and configure. This design goal was accomplished by using highly integrated components to keep the overall part count low. The circuitry of the 21XX is comprised of four functional blocks:

♦	Main PCB

♦	Power Circuitry

♦	Radio Module

♦	LED Flex PCB


Main PCB

The main PCB contains the primary circuitry of the 21XX.


Memory Map

The memory map of the UAP is completely configurable with software. Only the chip selects are defined by hardware. A suggested memory map of UAP bus resources is summarized below. This memory map is optimized to allow for the potential future expansion of both DRAM memory and Flash memory.


Microcontroller

The heart of the 21XX is the Motorola MPC860 microcontroller. It is a highly integrated embedded microcontroller and thus greatly reduces the part count. The following functionality is included in the MPC860 and used on the 21XX:

♦	Embedded RISC (reduced instruction set computing) PowerPC core

♦	4Kbit data cache and a 4Kbit instruction cache

♦	Memory controllers used for the flash memory and for the DRAM

♦	Bus monitor

♦	Software watchdog

♦	Interrupt controller

♦	RISC CPM (communications processor module)

♦	SCCs (serial communications controllers) used for the RS-232 port and for the Ethernet port

♦	PCMCIA interface used for two PCMCIA card slots and two mini-ISA slots

♦	Debug interface used for the Background Debug Mode (BDM) port


Clock Circuitry

The clock to the MPC860 is provided by an external 4.0 MHz “canned” oscillator. The MPC860 has internal phase lock loop (PLL) circuitry that multiplies this frequency by an integral factor for use as the system clock. The multiplication factor is under software control. At the time of this writing the system clock frequency is 40 MHz.


Reset Circuitry

Upon power-up the MPC860 and the flash memory are held in reset until the +3.3 volt supply is greater than +3.08 volts. When this power increase occurs, the power monitor IC, U16, releases the MPC860 PORESET* line. After this the MPC860 asserts the hard reset HRESET* line for 512 clocks.

When a hard reset occurs, the MPC860 configures its internal hardware.

On the rising edge of HRESET* the MPC860 samples the values present on the data bus D(0..31). During this period the values on the data bus default to 0 unless they are externally pulled up. In the case of the 21XX, D(1), D(4), and D(7) are pulled up during HRESET* by U3.

The configuration is set to all default except that the:

♦	Boot port size is set to 16 bits

♦	MPC860 internal memory space is set to 0xFF000000

♦	Initial interrupt prefix is set to 0x0000000.

After the hard reset, the MPC860 fetches its first instruction at offset 0x100 from the initial interrupt prefix, address 0x0000 0100.


Flash Memory

The flash memory provides the non-volatile storage for the application code, the boot code, and the configuration information. The 21XX boots up out of code stored in the flash memory. The application code is copied to DRAM and executed from it. The code stored in the flash can be updated through the serial port or either the RF or wired networks.

The flash memory device used is either the Intel 28F016SV, the Intel 28F016S5, or the Sharp 28F016SU. It is organized as 32 - 32,000x16-bit blocks. The programming voltage, VPP, is 5 volts. VPP is kept at 0 volts at all times except when erasing or programming the flash memory. This setting provides a means of security against accidental erasure or programming. The VPP is turned on and off with the FET switch, Q1, under software control.

The memory controller creates the chip enable, output enable, and write enable strobes, and is implemented with one of the MPC860’s general-purpose chip-select machines (GPCM0). It also defines the memory map for this particular memory bank. The MPC860’s GPCMs are under software control. Chip enable (0) is special because when the MPC860 comes out of reset it is active for all memory accesses until GPCM(0) is programmed. Chip enable 0 allows the MPC860 to boot out of flash no matter where it may eventually be located in memory space.

Chip enable 1 is ANDed with chip enable 0 so that the one physical flash memory device can be split into two logical memory blocks. This split allows the boot code and application code to be put into different blocks controlled by different MPC860 memory controllers. The boot code block could remain in “read-only” state while the application code is being updated. This process allows greater security and discourages the accidental erasure of the boot code.


DRAM

The DRAM has a two-fold purpose:

1.	It provides temporary data storage.

2.	Application code is loaded from Flash to the DRAM, where it is executed.

This functionality allows for higher performance since DRAM accesses are faster than Flash accesses.

The standard DRAM SIMM Module resides in a 72-pin SIMM socket. The main PCB supports the installation and use of 4MB to 16MB SIMM modules. The DRAM supports byte (8-bit), half-word (16-bit) and word (32-bit) access cycles as well as special burst access cycles. Currently the software only supports 4MB, EDO, and 60ns SIMM modules.

The DRAM controller functionality is provided by the MPC860. It controls the address multiplexing and DRAM RAS (row address strobe) before CAS (column address strobe) refresh. The MPC860 has an internal state-machine, called the User-Programmable Machine (UPM), that can be programmed to accommodate various DRAM SIMMs.


PCMCIA Ports

Two PCMCIA Release 2.1-compliant card slots are provided on the 21XX. These card slots will accept any Type I, II, or III cards, but the software driver for the card must also be present. The only deviation from the PCMCIA specification is that No Hot Insertions are allowed. Only 5 volts are available at the PCMCIA sockets. No 12-volt VPP is available.

The controllers for the PCMCIA slots are resident in the MPC860. The controllers are under software control.


Mini-ISA Ports

Two mini-ISA ports are also provided on the 21XX. These ports are used exclusively with the WLIF mini-ISA radios. The same PCMCIA controllers on the MPC860 control the mini-ISA ports, meaning that either a mini-ISA radio or a PCMCIA card can occupy a particular slot. Therefore, a maximum of two cards, either PCMCIA, mini-ISA, or a mixture, are allowable at one time.


Ethernet Port

The Ethernet controller functionality is carried out by SCC1 of the MPC860. The 10BaseT signals and AUI signals used for the 10Base2 port are created by the dual-serial transceiver, U18. U18 performs automatic port selection, manchester encoding/decoding with clock recovery, and offers diagnostic loopback test capability. The 20 MHz clock needed by U18 is created by dividing the system clock, 40 MHz, with U7.


10BaseT (RJ45)

U18 also contains the active circuitry needed to interface the Ethernet controller to the 10BaseT port. It performs automatic polarity switching in the event of a reversed polarity 10BaseT cable. U18 also performs automatic link integrity testing of the 10BaseT link. FL1 is an analog front end that contains an EMI filter, isolation transformer, and common mode choke. The 10BaseT connector, J2, is a standard RJ-45.


10Base2 (BNC)

The following is true of the components of the 10Base2:

♦	T1 provides isolation between the AUI (attachment unit interface) port of the Ethernet transceiver, U18, and the coaxial cable line driver/receiver, U8.

♦	The -9 volts needed by U8 is produced by U1, a DC to DC converter.

♦	U1 is shut down to conserve power when a good link is detected on the 10BaseT port because the 10BaseT and the 10Base2 port cannot be used simultaneously.

♦	The 10Base2 connector, J3, has a built-in spark gap to ground, which protects the port from high-voltage spikes. J3 also has a built-in .01 micro-farad (Ufd) capacitor to ground, which helps short high-frequency noise to ground.


Status LED Logic

Five LEDs are present on the 21XX, and display the unit’s status during the equipment’s normal operations. They display:

♦	Whether the power is applied

♦	If data traffic is present on radio 1

♦	If data traffic is present on radio 2

♦	If data traffic is present on the Ethernet port

♦	If the 21XX is a super-root. During power-up the LEDs display the results of the self-tests.

The LEDs are not on the main PCB but on an external flex LED PCB. However, the LED drive circuitry is on the main PCB. A connector, J4, is used to connect to the LED PCB. The power LED is merely tied to the +5 volt supply on the board so that when it is present the LED will light. The other four LEDs are controlled by software by using I/O ports PB26–PB29 of the MPC860. Circuitry is present that stretches a pulse on the PB(x) lines to about 50 milliseconds (mS). This is enough time for the light to be visible to the eye, and takes the burden away from the software. The circuitry can quickly pulse the line and then move on to other responsibilities.


RS-232 Port

The 21XX provides serial communications with an RS-232 serial port configured as a data terminal equipment (DTE) device (J1). The MPC860 Serial Communications Controller (SCC) 2 is used to control this serial port. U9 is used as the RS-232 transceiver. Ferrites and TVSs (transient voltage suppressors) are used to filter noise and protect the port from ESD.


+3.3 volt Supply

A linear regulator, LT1086 (VR1), converts the +5 volt input to +3.3 volts. The +3.3 volts are used by the MPC860.


BDM Port

The Background Debug Mode (BDM) port is used during development to perform debug operations using an appropriate emulator and host PC. The pads for a 10-pin connector, J11, are provided on the board. These pads connect to the MPC860, which provides the necessary control.


Power Circuitry

The power circuitry conditions and converts the AC line voltage into the 5-volts DC that is required by the main PCB. It consists of the AC input module and the power supply. No power switch is provided. Power is removed from the 21XX only when the AC power cord is unplugged.


AC Input Module

AC line cord is plugged into the AC input module’s IEC 320 connector. The AC input module also has an integral Radio Frequency Interference (RFI) filter that reduces electrical interference both into and out of the power cord. The AC input module is an off-the-shelf purchased part. For more information on the AC input module, refer to the manufacturer’s specification.


Power Supply

The power supply is an off-line switching power supply that furnishes +5 volts of power at 8 amps. The AC input voltage range is from 102–264V at 47 to 63 Hz. The power supply is an off-the-shelf part purchased directly from the manufacturer. For more information on the power supply, refer to the manufacturer’s specification.


Radio Module

The radio module provides the RF connectivity for the 21XX. The particular configuration of the 21XX determines which radio module is installed. The radio module is a purchased part. For more information on the radio module, refer to the specification of the radio module in the particular configuration of the 21XX.


LED Flex PCB

The LED flex printed circuit board (PCB) simply provides a means of mounting the status LEDs on the enclosure so they are visible to the user. The flex provides the connectivity to the LED controller on the main PCB.