Emergency Transfer Units And Associated Telephones - Avaya S8700 Installing

242 Installing the Avaya™ S8700 Media Server with Avaya™ MCC1 or SCC1 Media Gateway
Installing and Wiring Telephones
Connections at Trunk/Auxiliary Field
Figure notes
1
2
Emergency Transfer Units and Associated
Telephones
An 808A Emergency Transfer Panel mounted next to the trunk/auxiliary field provides
emergency transfer capability. You can use 2500-series analog telephones either for emergency
transfer or as normal extensions. For emergency transfer, connect the phones directly to the
808A; for normal extensions, wire them through the 808A. Analog Central Office (CO) and
Wide Area Telecommunications Service (WATS) trunks can provide emergency transfer
capability.
The 808A Emergency Transfer Panel provides emergency trunk bypass or power-fail transfer
for up to five incoming Central Office (CO) trunk loops to five selected station sets. The 808A
equipment's Ringer Equivalency Number (REN) is 1.0A.
At the Main Distribution Frame (MDF), the unit is controlled by a connection to a yellow
terminal row/connecting block in the trunk/auxiliary field. The unit is controlled by -48 VDC
from the EM TRANS RELAY PWR terminals. There are seven EM TRANS RELAY PWR
terminal pairs that allow powering of up to seven transfer units.
Should power be restored to the relays while a call connected through the 808A is in progress,
the 808A maintains the connection until the user goes on-hook. Each 808A can handle up to
five Central Office (CO) trunks.
To Network Interface Facility
To Control Carrier Auxiliary Connector
r758482b RBP 062696
3 One Pair of Wires
th
24
4
Interface Jack
May 2003
25
50
IN
Pair of RJ21X Network