Install and Wire Telephones
Task List: Typical Emergency Transfer Panel and Telephone Installation
SI Installation and Upgrades
541
June 2004
Figure 211: Connections for Telephone Used for Emergency Transfer and as Normal
Extension
Return to Task List
Install Telephones Used Only for
Emergency Transfer (Trunk/Auxiliary Field)
Return to Task List
1
Connect a pair of wires between the -48V and GRD terminals on the yellow emergency transfer
row/connecting block and the EM TRANS RELAY PWR terminal. See
Figure 212, Connections
for Telephone Used for Emergency Transfer,
on page 542.
2
Connect Central Office (CO) trunk leads from the purple field to TC terminals on the yellow
emergency transfer row/connecting block for each trunk.
3
Connect CO trunk leads from the green field to TK terminals on the yellow emergency transfer
row/connecting block for each trunk.
4
Connect ST leads on the yellow emergency transfer row/connecting block for each emergency
transfer telephone to the assigned terminal in the blue or white station distribution field. The ST
terminal leads should be terminated on the following pairs: 1, 4, 7, 10, 13, 16, 19, or 22 (the first
pair of any 3-pair group).
Figure notes
1
To Network Interface Facility
2
To Blue or White Station Distribution
Field
3
To TN2183 or Equivalent Analog Line
Circuit Pack
4
To TN747B (or Equivalent) Central
Office Trunk Circuit Pack
5
To Power Transfer Unit
6
To Control Carrier AUX Connector
TC
TK
LC
ST
1M
1m
2M
2m
3M
ALARM MONITORS
EM TRANS RELAY PWR
ACC PWR
3m
3w
TC
TK
LC
ST
TC
TK
LC
ST
TC
TK
LC
ST
TC
TK
LC
ST
C
O
M
1
N
O
1
N
C
2
N
C
1
C
O
M
2
N
O
2
C
O
M
3
N
C
3
G
R
D
-48
V
2820
10
35
EMXR
ST
ST
7
5
7
6
8
3
4
r758582b MMR 042996
