2.5 Connecting Extensions
Installation Manual
55
2.5
Connecting Extensions
2.5.1
Connecting Extensions
Extension jacks can be used for proprietary telephones (PTs), Direct Station Selection (DSS)
Consoles, single line telephones (SLTs), and Voice Processing Systems.
Connection
Insert the modular plugs of the telephone line cords (2- or 4-conductor wiring) into the modular jacks
on the PBX.
Maximum Cabling Distance of Extension Wiring (Twisted Cable)
2- or 4-conductor wiring is required for each extension as listed below. There are 4 pins that can be
used for connection: "T" (Tip), "R" (Ring), "H" (High) and "L" (Low).
To extensions
T
H
R L
H: High
T: Tip
R: Ring
L: Low
TEL Jack for Extension
Cable
Max. Distance
ø 0.4 mm:
140 m
ø 0.5 mm:
229 m
ø 0.6 mm:
360 m
CAT 5:
229 m
Cable
Max. Distance
ø 0.4 mm:
698 m
ø 0.5 mm:
1128 m
ø 0.6 mm:
1798 m
CAT 5:
1128 m
PT and DSS
Console
SLT
