Nortel Networks 400 4.0 User Manual
Chapter 19 System monitoring and troubleshooting
227
BCM200/400 4.0 Installation and Maintenance Guide
To troubleshoot the emergency telephone connected to a CTM
1
Check that the system has a CTM installed.
2
Check that there is no dial tone at the emergency telephone.
3
Replace the CTM.
ATA2 does not function
If the BCM ATA2 does not function, use these procedures to troubleshoot the problem.
To troubleshoot the ATA2
1
Make sure there is AC power connected to the ATA2 unit.
2
Make sure that the ATA2 is in the tones off mode (for data applications only).
3
Correctly configure the ATA2 telephone port for data communication.
4
Allow sufficient start-up time.
5
Assign the prime line.
6
Assign a ringing line if required. For example, auto-answer modems and fax machines require
a ringing line.
a ringing line.
To check the ATA 2 wiring
1
ATA2 to the terminal. The resistance must be 200 ohms or less for data applications and
1,300 ohms or less for voice applications.
1,300 ohms or less for voice applications.
2
BCM 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.
24 AWG) or less. Do not use bridge taps and loading coils between the BCM system and
ATA2.
3
External line to the BCM system. Ensure the external line is correctly connected to the BCM
system and make sure there is dial tone.
system and make sure there is dial tone.
To check for dial tone at the ATA 2
1
If there is no dial tone, replace an analog telephone for the data communication device.
2
If 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).
telephone has dial tone).