2.3.3 Extension Connection
2-12 Installation
Extension jacks 1 through 4 are for all kinds of telephones.
Extension jacks 5 through 8 are only for digital proprietary
telephones. To make extension jacks 5 through 8 usable for all
kinds of telephones, a 4-SLT Extension Expansion Card (KX-
TD30870) must be installed.
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
Standard Telephone 22AWG 1798m (5900 feet)
24AWG 1128m (3700 feet)
26AWG 698m (2290 feet)
Proprietary Telephone 22AWG 360m (1180 feet)
24AWG 229m (750 feet)
26AWG 140m (460 feet)
2 or 4-conductor wiring is required for each extension as listed
below. There are four pins for possible connection: “T”, “R”, “D1”
and “D2”.
T: Tip D1: Low
R: Ring D2: High
Note •
If a KX-TD30870 is installed
Note the jack numbers for the facsimile and standard telephone which
have Caller ID service.
• If a telephone or answering machine with an A-A1 relay is connected to
the system, set the
A-A1 relay switch of the telephone or answering machine to the OFF
position.
1 pair wire (T, R)
1 pair wire (
D1
,
D2
) or
2 pair wire (
D1
,
D2
, T, R) for eXtra Device Port
2 pair wire (
D1
,
D2
, T, R)
Wiring
Telephone
Standard telephones
Digital proprietary telephone
(e.g., KX-T7436, KX-T7235)
Analog proprietary telephone
(e.g., KX-T7030, KX-T7130)
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