Install and Wire Telephones
Task List: Typical Emergency Transfer Panel and Telephone Installation
538
SI Installation and Upgrades
June 2004
8
4
9
5
10
5
11
Not Used
12
Test Switch
Pin Assignments for 25-Pair Connector
26
W-BL
TTC1
Tip-PBX Trunk Circuit 1
1
BL-W
RTC1
Ring-PBX Trunk Circuit 1
27
W-O
TTK1
Tip-CO Trunk Circuit 1
2
O-W
RTK1
Ring-CO Trunk Circuit 1
28
W-G
TLC1
Tip-PBX Line Port 1
3
G-W
RLC1
Ring-PBX Line Port 1
29
W-BR
TST1
Tip-Emergency Terminal 1
4
BR-W
RST1
Ring-Emergency Terminal 1
30
W-S
TTC2
Tip-PBX Trunk Circuit 2
5
S-W
RTC2
Ring-PBX Trunk Circuit 2
31
R-BL
TTK2
Tip-CO Trunk Circuit 2
6
BL-R
RTK2
Ring-CO Trunk Circuit 2
32
R-O
TLC2
Tip-PBX Line Port 2
7
O-R
RLC2
Ring-PBX Line Port 2
33
R-G
TST2
Tip-Emergency Terminal 2
8
G-R
RST2
Ring-Emergency Terminal 2
34
R-BR
TTC3
Tip-PBX Trunk Circuit 3
9
BR-R
RTC3
Ring-PBX Trunk Circuit 3
35
R-S
TTK3
Tip-CO Trunk Circuit 3
10
S-R
RTK3
Ring-CO Line Port 3
1 of 2
Trunk/Test Switches
Switch
Number
Circuit
Number
2 of 2