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2.5 Connecting Extensions
Installation Manual 53
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
THRL
H: High
T: Tip
R: Ring
L: Low
TEL Jack for Extension
Cable Max. Distance
26 AWG: 140 m (459 ft)
24 AWG: 229 m (751 ft)
22 AWG: 360 m (1181 ft)
CAT 5: 229 m (751 ft)
Cable Max. Distance
26 AWG: 698 m (2289 ft)
24 AWG: 1128 m (3700 ft)
22 AWG: 1798 m (5897 ft)
CAT 5: 1128 m (3700 ft)
PT and DSS
Console
SLT