TN-906-AN Page 13 of 20
© Tait Electronics Limited 21 December 2005
5 Configuring the APS
5.1 Ensuring the Security of Configuration Data
The configuration data of many APS units is stored in RAM which has a
battery back-up. This battery should have a life of approximately 3 years
when the APS is not powered up, and may need to be changed periodically.
You may also wish to replace the battery before installing your APS to ensure
maximum battery life and security of configuration data. A typical symptom
of battery failure is the loss of configuration data when the APS is powered
down for some time.
The battery is typically a BR1225 and is located under a clip on the main
board of the APS. To replace the battery, proceed as follows:
1. Disconnect the AC mains power.
2. Remove the top cover.
3. Carefully replace the battery, observing normal antistatic precautions.
4. Replace the cover.
5.2 Configuring the Set-up Switches
1. Power up the APS.
2. Configure the set-up switches as shown below. These switches are
located on the rear panel of APS units with up to 8 ports, and on the
bottom cover of units with 16 or more ports.
The settings for SW1, SW2, and SW3 are optional, however the set-
tings for all other switches are mandatory. We recommend a baud rate
of 57k6, as it will give the highest possible data transfer rate through
the modem on a “good” PSTN connection. If you select a different
Switch Setting Function
SW1 ON (down) sets the baud rate to 57k6
SW2 OFF
SW3 OFF
SW4 OFF no handshaking
SW5 OFF
SW6 OFF terse messages
SW7 OFF echo disabled
SW8 ––– currently not used
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