Installation
38
Installation Manual
2.4.3
Extension Connection
Wire Specifications
The required wire specifications are as follows:
2 or 4-conductor wiring is required for each extension as listed below. There are 4 connection
pins: "A" (A-wire), "B" (B-wire), "L" (Low) and "H" (High).
Maximum length of cable
The maximum length of the extension line cord (twisted cable) that connects the system and
the extension is as follows:
Wire
Diameter of conductor
Solid wire
ø 0.4 — ø 0.6 mm
Telephone
Wiring
Single line telephones
1 pair wire (A, B)
Digital proprietary telephones
2 pair wire (L, H, A, B)
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.
Diameter
Maximum length
SLT
ø 0.5 mm
620 m
DPT
ø 0.5 mm
240 m
The maximum length of the cables with the same diameters may vary depending on the types
of the cables.
