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Troubleshooting
How Radio Frequency Scanning Works
How Radio Frequency Scanning Works
The following steps describe how a DOCSIS-compliant CMAP performs radio frequency
scanning:
1.
Looks at the last “known good channel” (repeat this every 64 channel checks).
2.
Checks the sixteen last known frequencies (repeat this every 32 channel checks).
3.
Scans generic channels (where the center of the channel is an integer spaced by
250kHz), first [from 112 MHz to 858.25 MHz - 2986 channels]).
A complete frequency scan requires approximately 4526 channel checks and lasts
approximately 45 minutes.
NOTE:
The scanning of generic DOCSIS channels is required the first time the CMAP
connects to an MSO. After the initial scan, the CMAP is able to retrieve the local country
frequency plan during its normal operation.
Summary of Contents for ZoneFlex 7761-CM
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