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9.5.2
Audio (telemetry) cable
The audio telemetry data signals used for PTZ site receiver control requires a minimum
of a single pair of balanced conductors (in two-wire mode), with an overall screen or
shield.
This shield must be grounded at the subrack equipment end of the cable to prevent
radiation and reduce susceptibility of electromagnetic interference.
Cable Type
Belden 8723
The recommended cable has individually screened pairs in an aluminum-polyester
shield with a 24AWG stranded tinned copper drain wire. The cables are covered with a
PVC jacket. The wire conductors are polypropylene insulated providing a rating of 300V
at 60
o
C.
Rev. C
CAUTION: To prevent potential earth loop problems, do
not ground the shield at the PTZ camera site.
Number
Wire
of
Conductors
Pairs
22 Gauge
2
Stranded Tinned
copper (7x30)
WARNING: It is advisable to use a cable that contains
two pairs of balanced wires. The cost difference (to a
single pair cable) is usually minimal. The second pair
would be required if four wire communications is used or
simply as a spare wire pair for on-going system
maintenance.
Nominal
Outside
Capacitance pF/m
Diameter
(mm)
4.19
9-6
Nominal
(between
conductors)
116
HMXMU001018
10/06
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