Specifications
s
Installation
IMI
66-031
’ L
f-
CONNECTIONS
Connection between the KSU and the TELCO or PABX line is via four-wire
cable and modular plug/jack connection.
The maximum length of a line
c
cable is determined by the limitations detailed above.
A-Lead Control
The KSU inputs of TELCO lines
7
and 8 are configured to detect an
A-lead (A and Al) control signal when it is applied at the modular
line jack of the KSU.
When the KSU detects an A-lead control signal
on line
7
or
8,
it causes a busy line light indication to be shown at
all of the key system stations connected to it.
The A-lead loop
resistance must not exceed 1500 ohms.
A typical use of A-lead control signal detection would find a
single-line,
non-key system, telephone set, modem, data terminal, etc.
configured for A-lead control and connected to the TELCO line at
terminal clips provided on the station connector block connected to
J2
of the KSU.
A connected device parallels the tip and ring leads of
the TELCO line and supplies the A and Al control signals to the KSU.
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Connections between the KSU and the stations are typically via two
66M-xx station distribution connector blocks per the discussion steps
given below.
Refer to Figures 2 through 5 for connection details.
Various tvnes of station distribution connector blocks are available
and
may be-used in lieu of the type 66M-xx connector if desired.
i.
2.
NOTE
The system provides one tip and ring pair connected to line
1 as an emergency, power failure circuit.
This power
failure pair is located as detailed on Figures 4 and 5.
The
power failure pair is only active during a power failure.
An industry standard,
single-line telephone, such as a type
2500, can be connected to this pair and used to provide
communications capability should the AC power to the system
be interrupted.
Connect a cable between the KSU connector and the connector on the
66~-xx
connecting block.
Connect four-wire,
twisted-pair cables from-the 66M-XX block
directly to the station or from the 66M-xx block to modular
RJ14
configuration station jacks.
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