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Table 18: Pin assignments for 25-pair connector (continued)
47
22
48
23
49
24
50
25
Figure 49: Connections for telephone used for emergency transfer
2822
1
2
TC
TK
LC
ST
TC
TK
XR
1m
AL
1M
3M
3m
ALARM MONITORS
Figure notes:
1. To Network Interface Circuitry
2. To TN747B (or Equivalent) Central Office
Trunk Circuit Pack
3. To Blue or White Station Distribution Field
808A Emergency Transfer Panel and telephone installation examples
V-O
NC2
Normally Closed 2 Contact
O-V
NC1
Normally Closed 1 Contact
V-G
COM2
Common 2 Relay Contact
G-V
NO2
Normally Open 2 Contact
V-BR
BR-V
V-S
GRD
Ground from Aux Cable
S-V
-48PX
-48V from AUX Cable
25
50
3
LC
ST
TC
TK
LC
ST
TC
TK
3w
EMXR
2822
1
C
N
N
LC
ST
TC
TK
LC
ST
O
O
C
M
1
2
1
4. To Power Transfer Unit
5. DB9 Alarm Cable to
TN2312BP Adapter
3 of 3
C
C
N
N
N
G
O
O
C
O
C
R
-48
M
M
1
2
3
D
2
3
V
r758580b LAO 111104
Issue 3 January 2008
103
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