C-COR Flex Max901e, Руководство по эксплуатации оборудования

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D
1502154 Rev D Reference Tables D-3
When Preceding Cable Loss and Internal Equalization are Known
This procedure accounts for cable losses and the internal equalization of the Flex Max901e. To use
the
dB of Cable Equalized at Highest Frequency (for cable equalizers) and dB of cable simulated (for
cable simulators) columns of the accessory tables, the amount of factory installed alignment of the
Flex Max901e (if any) must be known. This information is found on the Flex Max901e Specification
Sheet.
1. Note the amount of cable loss the Flex Max901e is designed to accommodate at the highest
system frequency as listed under
Factory Alignment/Cable Loss on the Flex Max901e
Specification sheet.
2. To determine the actual system cable loss at the highest frequency, do either of the
following:
■
Refer to the System Map and note the cable loss in dB preceding the Flex Max901e
being balanced.
■
Calculate the cable loss using cable length and the Manufacturer's Cable Loss
Charts.
3. Subtract the Flex Max901e's factory-installed alignment from the system cable loss to
determine the dBs of cable equalization/simulation required at the highest frequency.
■
If X dB is positive (+), refer to the SEQ table that lists the accessories being used in
the system. Select the SEQ having a value as close to X dB as possible, as listed in
the “dB of Cable Equalized at Highest Frequency” column.
■
If X dB is negative (–), refer to the SCS table that lists the accessories being used in
the system. Select the SCS with a value as close to X dB as possible, as listed in the
“dB of Cable Simulated at Highest Frequency” column.
System Cable Loss
– Factory Alignment/Cable Loss
= X dB