Clear-Com Communication Systems
Encore System Installation Instruction Manual
1-7
The performance of a Clear-Com system depends upon the use of
Clear-Com or Clear-Com approved compatible headsets. Use of
headsets other than these can induce crosstalk into a multi-channel
system through the headset cable. Clear-Com also recommends
against the use of headset extension cables or headset "Y" cables, as
they will increase crosstalk into a multi-channel system.
INTERCOM CABLE CONSIDERATIONS
The Clear-Com intercom line is intended to run on one shielded cable
pair per intercom channel. One conductor carries audio, and the other
conductor carries the DC power for Remote Stations. The shield
serves as the ground return for the audio and power conductors.
When choosing interconnect cable, keep the following considerations
in mind:
• Keep cable runs under 500 feet. The DC resistance of the
ground or common conductor affects crosstalk. For
permanent installation runs longer than 500 feet, do not use
wire smaller than 20 gauge. The capacitance of the
interconnect cable affects system frequency response and
sidetone stability. Total capacitance should not be greater
than 0.25 uF.
• Ground Isolation: The Pin 1 ground connection of each
XLR connector must be isolated from the chassis. Pin 1
should not be connected to the shell of the XLR connector.
• Multi-pair Cable: Individually shielded multi-pair cable is
acceptable for use in multi-channel systems. For crosstalk
considerations the shields must be tied together on both ends
of the cable to produce the lowest possible DC resistance
path for the ground return.
• Suggested Cable Types: The following chart lists the
specifications of various BELDEN cables:
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