
How to protect
the line
connections
Transient voltage spikes, if induced onto CO or CENTREX lines, can travel
through the cable and into the common equipment. The telephone company offers
basic protection against this condition, but it is usually designed to protect the
central office circuits. While this CO or CENTREX service will also provide
some protection to the common equipment, you should not rely upon it for total
protection. To help ensure that external over-voltage surges do not damage the
system, Comdial recommends that you install and properly ground gas discharge
tubes, or similar primary protection devices, on all lines.
If spare conductors exist in the cables that are run between the line boards and the
66M-xx connector blocks, it is a good practice to connect them to earth ground to
help prevent them from inducing radio frequency and/or AC interference into the
system.
Each line board is shipped with a ferrite collar. Snap one of these around each line
cable to provide protection against radio frequency interference.
Connecting the Stations
How to connect
the stations
Station boards have 50-pin amphenol-type connectors that are cable-connected to
type 66M-xx connector blocks. Wiring from the connector blocks to the stations
is via twisted-pair cable to standard wall jacks. The gauge size of the twisted-pair
station wiring determines the maximum distance allowed from the common
equipment to the stations.
Station Type
Wire Gauge
20 AWG 22 AWG 24 AWG
Digital Telephone 2500 Feet 2000 Feet 1500 Feet
Industry-Standard Telephone 4000 Feet 3500 Feet 3000 Feet
How to protect
the station
connections
If spare conductors exist in the cables that are run between the station boards and
the 66M-xx connector blocks, it is a good practice to connect them to earth
ground to help prevent them from inducing radio frequency and/or AC
interference into the system.
Each station interface board is shipped with an appropriate supply of ferrite
collars. Snap one of these around each station cable to provide protection against
radio frequency interference.
Installing
a DSS/BLF
console
Install a DSS/BLF Console at any station in the system as a companion to a
telephone. There is no limit to the maximum number of consoles that can be
installed on a system. When you install a console, you must also define the station
as a console with programming.
28 – Connecting the System
GCA40–242 General Description
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