17
Connecting Keysets
Four wires (two pair) twisted cable with a double-sided modular plug and a terminal block are
recommended for a keyset connection to the KSU. One end of the terminal block is connected to the
MDF via a 50-pin cable, and the other end of the terminal block is connected to a keyset via a double-
sided modular plug line (two pair).
Cabling terminal block
LJU Pin 1 reserved
Pin 2 Data +
Pin 3 Voice (Ring)
Pin 4 Voice (Tip)
Pin 5 Data -
Pin 6 reserved
The voice pair has no polarity. However, take care when connecting the data pair because of
its polarity. Make sure that the cable run length does not exceed 400 metres using 24 AWG
wire.
All station cabling must be twisted pair.
Refer to the Amphenol connection table in Figure 3.
Connecting to hybrid station port
The system is equipped with six hybrid station ports which can accommodate keysets or single line
telephones. Each port should be selected for use as a keyset or single line telephone. Any of these
ports may be used for a keyset station and its connection method is the same as above.
Before cabling, the related DIP switches should be set as follows:
The selection of each hybrid station requires you to move four levers at one DIP switch.
3rd Station S1 DIP
4th Station S2 DIP
5th Station S3 DIP
6th Station S4 DIP
7th Station S5 DIP
8th Station S6 DIP
Each DIP switch comprises four levers which should be set to “K” positions for keyset
assignment. These are marked on the board.
Connecting Single Line Telephones
A single or two-pair twisted cable with a double-sided modular plug and a terminal block are
recommended for connecting a single line telephone to the KSU. One end of the terminal block is
connected to the MDF via a 50-pin cable and the other end is connected to the single line telephone via
the twisted modular cable.
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