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Installing and wiring telephones and trunks
104 Installing and Connecting the MDF and Telephones
Figure 50: Connections for telephone used for emergency transfer and as normal
extension
Installing telephones used only for
emergency transfer (trunk/auxiliary field)
To install telephones used only for emergency transfer:
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 49: Connections for telephone used for emergency transfer
on page 103.
2. Connect 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.
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. DB9 Alarm Cable to TN2312BP
Adapter
TC TK LC ST 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 76 83 4
XR 1m AL 1M
ALARM MONITORS
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