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Configuring Subscriber-End Broadband Access Router Features
Subscriber-End Broadband Access Router Basic Troubleshooting
MC-636
Cisco IOS Multiservice Applications Configuration Guide
The downstream frequency search table is arranged so that the first frequencies that are scanned are
above 450 MHz. Because many CATV systems have been upgraded from 450 MHz to 750 MHz coaxial
cable, digital channels have a high chance of being assigned in the new spectrum. The search table omits
channels below 90 MHz and above 860 MHz because the DOCSIS specification does not mandate their
coverage.
The
CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND field tells you which frequencies the cable access
router will scan. The
CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY field tells you the frequency the
router locked onto and saved to NVRAM for future recall. The
CMAC_LOG_DS_64QAM_LOCK_ACQUIRED
field communicates the same information. The
CMAC_LOG_DS_CHANNEL_SCAN_COMPLETED field indicates
that the scanning and synchronization was successful.
508144.348 CMAC_LOG_STATE_CHANGE ds_channel_scanning_state
508144.350 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 88/453000000/855000000/6000000
508144.354 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 89/93000000/105000000/6000000
508144.356 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 90/111250000/117250000/6000000
508144.360 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 91/231012500/327012500/6000000
508144.362 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 92/333015000/333015000/6000000
508144.366 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 93/339012500/399012500/6000000
508144.370 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 94/405000000/447000000/6000000
508144.372 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 95/123015000/129015000/6000000
508144.376 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 96/135012500/135012500/6000000
508144.380 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 97/141000000/171000000/6000000
508144.382 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 98/219000000/225000000/6000000
508144.386 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND 99/177000000/213000000/6000000
508144.390 CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY 699000000
508145.540 CMAC_LOG_UCD_MSG_RCVD 3
508146.120 CMAC_LOG_DS_64QAM_LOCK_ACQUIRED 699000000
508146.122 CMAC_LOG_DS_CHANNEL_SCAN_COMPLETED
Event 3—Obtain Upstream Parameters
The Cisco uBR900 series waits for an upstream channel descriptor (UCD) message from the CMTS. The
UCD provides transmission parameters for the upstream channel.
508146.124 CMAC_LOG_STATE_CHANGE wait_ucd_state
508147.554 CMAC_LOG_UCD_MSG_RCVD 3
508147.558 CMAC_LOG_UCD_NEW_US_FREQUENCY 20000000
508147.558 CMAC_LOG_SLOT_SIZE_CHANGED 8
508147.622 CMAC_LOG_FOUND_US_CHANNEL 1
508147.624 CMAC_LOG_STATE_CHANGE wait_map_state
508148.058 CMAC_LOG_MAP_MSG_RCVD
508148.060 CMAC_LOG_INITIAL_RANGING_MINISLOTS 40
Event 4—Start Ranging for Power Adjustments
The ranging process adjusts the transmit power of the cable access router. Ranging is performed in two
stages: ranging state 1 and ranging state 2.