Installation 2-9
2.8 Extension Connection
Extension jacks 01 through 08 for the KX-TA308 and extension jacks 01 through 16 for the
KX-TA616 can be used for all kinds of telephones.
Telephone Wiring
The maximum length of the extension line cord (twisted cable) which connects the system
and the extension is as follows.
Diameter of the line Max. length
Single Line Telephone 22 AWG 1798 m {5900 feet}
(Station Loop Limit:
24 AWG 1128 m {3700 feet}
600 Ω including set)
26 AWG 698 m {2290 feet}
Proprietary Telephone 22 AWG 360 m {1180 feet}
(Station Loop Limit:
24 AWG 229 m {750 feet}
40 Ω)
26 AWG 140 m {460 feet}
2 or 4-conductor wiring is required for each extension as listed below. There are 4 pins
possible for connection: “T” (Tip), “R” (Ring), “L” (Low) and “H” (High).
• If a telephone or answering machine with an A-A1 relay is connected to the system, set
the A-A1 relay switch on the telephone or answering machine to the OFF position.
Connection
Insert the modular plugs of the telephone line cords (2 or 4-conductor wiring) into the
modular jacks on the system.
Telephone
Single line telephones
Proprietary telephone
(e.g., KX-T7330)
Wiring
1 pair wire (T, R)
2 pair wire (L, H, T, R)
To extensions
(JACK 01–08 for the KX-TA308,
JACK 01–16 for the KX-TA616)
THRL
H: High
T: Tip
R: Ring
L: Low
View of TEL Jack (Extension)
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