Cisco uBR900 Series Configuring page 27

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 since the DOCSIS specification does not
mandate their coverage.
The
CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
router will scan. The
CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY
the router locked onto and saved to NVRAM for future recall. The
CMAC_LOG_DS_64QAM_LOCK_ACQUIRED
CMAC_LOG_DS_CHANNEL_SCAN_COMPLETED
successful.
508144.348 CMAC_LOG_STATE_CHANGE
508144.350 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.354 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.356 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.360 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.362 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.366 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.370 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.372 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.376 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.380 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.382 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.386 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.390 CMAC_LOG_WILL_SEARCH_SAVED_DS_FREQUENCY
508145.540 CMAC_LOG_UCD_MSG_RCVD
508146.120 CMAC_LOG_DS_64QAM_LOCK_ACQUIRED
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
508147.554 CMAC_LOG_UCD_MSG_RCVD
508147.558 CMAC_LOG_UCD_NEW_US_FREQUENCY
508147.558 CMAC_LOG_SLOT_SIZE_CHANGED
508147.622 CMAC_LOG_FOUND_US_CHANNEL
508147.624 CMAC_LOG_STATE_CHANGE
508148.058 CMAC_LOG_MAP_MSG_RCVD
508148.060 CMAC_LOG_INITIAL_RANGING_MINISLOTS
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.
The
CMAC_LOG_POWER_LEVEL_IS
series to adjust to. The
CMAC_LOG_RANGING_SUCCESS
successful.
508148.062 CMAC_LOG_STATE_CHANGE
508148.064 CMAC_LOG_RANGING_OFFSET_SET_TO
508148.066 CMAC_LOG_POWER_LEVEL_IS
508148.068 CMAC_LOG_STARTING_RANGING
508148.070 CMAC_LOG_RANGING_BACKOFF_SET
508148.072 CMAC_LOG_RNG_REQ_QUEUED
508148.562 CMAC_LOG_RNG_REQ_TRANSMITTED
508148.566 CMAC_LOG_RNG_RSP_MSG_RCVD
field tells you what frequencies the cable access
field communicates the same information. The
field indicates that the scanning and synchronization was
field is the power level that the CMTS told the Cisco uBR900
field indicates that the ranging adjustment was
Configuring the Cisco uBR900 Series Cable Access Routers 27
Basic Troubleshooting
field tells you the frequency
ds_channel_scanning_state
88/453000000/855000000/6000000
89/93000000/105000000/6000000
90/111250000/117250000/6000000
91/231012500/327012500/6000000
92/333015000/333015000/6000000
93/339012500/399012500/6000000
94/405000000/447000000/6000000
95/123015000/129015000/6000000
96/135012500/135012500/6000000
97/141000000/171000000/6000000
98/219000000/225000000/6000000
99/177000000/213000000/6000000
699000000
3
699000000
wait_ucd_state
3
20000000
8
1
wait_map_state
40
ranging_1_state
9610
28.0 dBmV (commanded)
0
0