Cable Connection Verification; Dry Contact Alarm Relay - TC Communications TC1631R User Manual

Cable Connection Verification

Electrical Cables:
1. Make sure all electrical signal connections match the pin assignments (I/O) for the device (check User's
Manual if necessary).
2. Verify the signal connections by checking the status LEDs on the front panel of the TC1631R/S. If the
"LOCRD" LED is "Flashing", a transmit signal is not being detected from the local device. If the
"RMTRD" LED is "Flashing", no response signal is being detected from the remote device.
3. Verify that the correct Line Code setting (and copper Line Length setting for T1) has been configured
and that the appropriate LEDs light to match the settings selected.
4. Conduct a Local Loopback Test to help isolate an electrical interface problem (see Chapter 4 - Bench
Tests).
Optic Cables:
If the "SYNC" LED on the front panel is flashing, this is an indication that the optical signal is not being
correctly received. Usually, unsecured fiber optic connectors or faulty cable are to blame. A good connection
is indicated by the "SYNC" LED on the front panel being solidly lit. This indicates that the receiving cable
is correctly connected to Remote unit's optic "TxA" or "TxB" (dual optic models only).

Dry Contact Alarm Relay

TC1631 has built-in Dry Contact Alarm Relay. The status for the alarm relay is "normal open." It is
triggered by the following major alarm conditions:
Optic signal lost
Local T1/E1 signal lost
Local user's T1/E1 device is sending "mark" data pattern
Local user's T1/E1 device's signal is causing bipolar violations
Invalid line code setting
Invalid copper line length setting
The electrical rating for the dry contact alarm relay is
200VDC max
500 mA max.
switching power is 10 watts max.
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TC1631R/S
User's Manual
Rev. 1.6