Nortel Networks BCM200, 400 4.0 manual ATA2 does not function, To troubleshoot the ATA2

Chapter 19 System monitoring and troubleshooting 227

To troubleshoot the emergency telephone connected to a CTM

1Check that the system has a CTM installed.

2Check that there is no dial tone at the emergency telephone.

3Replace the CTM.

ATA2 does not function

If the BCM ATA2 does not function, use these procedures to troubleshoot the problem.

To troubleshoot the ATA2

1Make sure there is AC power connected to the ATA2 unit.

2Make sure that the ATA2 is in the tones off mode (for data applications only).

3Correctly configure the ATA2 telephone port for data communication.

4Allow sufficient start-up time.

5Assign the prime line.

6Assign a ringing line if required. For example, auto-answer modems and fax machines require a ringing line.

To check the ATA 2 wiring

1ATA2 to the terminal. The resistance must be 200 ohms or less for data applications and 1,300 ohms or less for voice applications.

2BCM system to ATA2. The wiring must be equivalent to 800 m of 0.5 mm wire (2,600 ft. of 24 AWG) or less. Do not use bridge taps and loading coils between the BCM system and ATA2.

3External line to the BCM system. Ensure the external line is correctly connected to the BCM system and make sure there is dial tone.

To check for dial tone at the ATA 2

1If there is no dial tone, replace an analog telephone for the data communication device.

2If there is no dial tone at the ATA2 unit:

a Disconnect the line side of ATA2. Connect a BCM telephone to the ATA2 port.

b Check that the connection from ATA2 to the BCM system is functioning correctly (the telephone has dial tone).

BCM200/400 4.0 Installation and Maintenance Guide