Cabling, Determining maximum cable length – Grass Valley 8972PX User Manual
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8972PX — Instruction Manual
Installation
Cabling
Cabling is done on the rear of the 8900PX-DR rear module illustrated in
. Inputs and outputs are also illustrated on the I/0
Config web page (
I/O Config Web Page on page 52
). Pinouts for the SubD-25
GPI I/O connector are given in
Output pairs Output 1.1 and 1.2, Output 2.1 and 2.1, and Output 3.1 and 3.2
are user-configurable to output different signals as desired. For configura-
tion information, refer to
Configuration Summary on page 11
.
Before cabling the module, read the following section on determining cable
length.
Determining Maximum Cable Length
To maintain the quality of the Program Output signal when the front
module is bypassed in the case of loss of power or front module removal,
the total cable length must be determined in Passive Bypass mode. The
total cable length is defined as the addition of the cable length from the
signal source to the 8972PX Primary (J9) or Secondary input (J10) plus the
cable length from the 8972PX output BNC J7 to the destination equipment
as shown in
. This cable length is specified as no more than 300m
in SD and 100m in HD. Refer to
for a list of specifica-
tions.
When cabling the module, you can test cable length and the quality of the
bypassed Program Output signal by setting the Bypass Mode on the
System Config web page to Passive Bypass Only (see
) or removing
the module and monitoring the Program Output signal on J7 (Relay-Pro-
tected Program Output).
Figure 9. Total Cable Length Illustration
J10: Secondary Input
8972PX Module
J9: Primary Input
J7: Program Output
Relay Protected
Program Output
Cable Length A
Cable Length A + Cable Length B = Total Cable Length
Cable Length B
8580_03
Signal Source
Destination
Equipment