Lucent Technologies SLC ConnectReach User & Service Manual page 69

Product Description
Peripheral Hardware Equipment
Peripheral Equipment Description
(Continued)
Trunk bypass unit
In the event that the SLC ConnectReach system fails, the T1 link fails, or there is
an electrical power failure, a trunk bypass unit allows certain phones access to
outside lines for emergency 911 calls.
If a trunk bypass unit is installed, calls will be transmitted through the bypass unit
to the CO. The control relay on the bypass unit is connected to pins 25/50 on the
VOICE CHANNELS port. A description of the normally open alarm connection
provided by pins 25/50 is provided earlier in this chapter. In order for the bypass
unit to function properly, an FX or FXS trunk is necessary. The FXO voice card on
the SLC ConnectReach system is optional. Currently, the DEES Communications
8 Trunk Powerfail Bypass unit, model 154A 24V is the only trunk bypass unit that
has been tested and proven to be compatible with the SLC ConnectReach
system. The following figure diagrams the routing between the SLC
ConnectReach system and the bypass unit.
363-208-050
Issue 4 June 2002 2-27