Lucent Technologies SLC ConnectReach User & Service Manual page 57

Product Description
Physical and Functional Description
Description of Interface Ports
(Continued)
VOICE
CHANNELS port
(continued)
Pin pairs 1 through 24 correspond to T1 channels 1 through 24. Pair 25/50 is a
normally open alarm connection (150 VRMS @ 100 mA) that connects to an
alarm relay. The alarm relay provides an indication to an external alarm or trunk
bypass unit that the SLC ConnectReach system unit is not functioning properly
and one or more of the yellow or red status light emitting diodes (LEDs) are
lighted.
The following four conditions will cause the alarm relay to close:
Power fails
3
SLC ConnectReach system fails
3
Network T1 alarm is enabled and the network T1 link fails
3
Secondary/fractional T1 alarm is enabled and the secondary/fractional T1
3
link fails.
If the SLC ConnectReach system has a foreign exchange office (FXO) card used
with local call routing (LCR) and a trunk bypass unit is connected, the network
T1 alarm should be disabled. If the T1 link fails, calls will automatically be rerouted
out the FXO port, which is connected to the trunk bypass. If the network T1 alarm
is enabled, calls will be rerouted out the foreign exchange station (FXS) port and
within the bypass unit causing connection problems.
363-208-050
Issue 4 June 2002 2-15