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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Install and Wire Telephones and Other Equipment
Page 5-36Emergency Transfer Units and Associated Telephones
5
Emergency Transfer Units and
Associated Telephones
Emergency transfer capability is provided by a transfer unit mounted next to the
trunk/auxiliary field. Analog telephones connected to the transfer panel can be
used. The 500-and 2500-type telephones can also be used as normal
extensions. Emergency transfer capability may be provided on analog Central
Office (CO) and Wide Area Telecommunications Service (WATS) trunks.
The 808A Emergency Transfer Panel provides emergency trunk bypass or
power-fail transfer for up to 5 incoming CO trunk loops to 5 selected station sets.
The 808A equipment’s Ringer Equivalency Number (REN) is 1.0 Amp.
At the 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 7 EM TRANS RELAY
PWR terminal pairs that allow powering of up to 7 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 5 CO trunks.