Cisco UBR904 Troubleshooting Guide - Page 12

Event, Obtain Upstream Parameters, Start Ranging for Power Adjustments, modem to adjust to. The field

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Troubleshooting Steps Event 3-Obtain Upstream Parameters The cable modem waits for an upstream channel descriptor (UCD) message from the headend Cisco uBR7246. This is done to retrieve 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 wait_ucd_state 3 20000000 8 1 wait_map_state 40 Event 4-Start Ranging for Power Adjustments The ranging process adjusts the cable modem's transmit power. The cable modem performs ranging in two stages: ranging state 1 and ranging state 2. The field CMAC_LOG_POWER_LEVEL_IS is the power level that the Cisco uBR7246 told the cable modem to adjust to. The field CMAC_LOG_RANGING_SUCCESS indicates that the ranging adjustment was 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 508148.568 CMAC_LOG_RNG_RSP_SID_ASSIGNED 508148.570 CMAC_LOG_ADJUST_RANGING_OFFSET 508148.572 CMAC_LOG_RANGING_OFFSET_SET_TO 508148.574 CMAC_LOG_ADJUST_TX_POWER 508148.576 CMAC_LOG_POWER_LEVEL_IS 508148.578 CMAC_LOG_STATE_CHANGE 508148.580 CMAC_LOG_RNG_REQ_QUEUED 508155.820 CMAC_LOG_RNG_REQ_TRANSMITTED 508155.824 CMAC_LOG_RNG_RSP_MSG_RCVD 508155.826 CMAC_LOG_ADJUST_RANGING_OFFSET 508155.826 CMAC_LOG_RANGING_OFFSET_SET_TO 508155.828 CMAC_LOG_RANGING_CONTINUE 508165.892 CMAC_LOG_RNG_REQ_TRANSMITTED 508165.894 CMAC_LOG_RNG_RSP_MSG_RCVD 508165.896 CMAC_LOG_ADJUST_TX_POWER 508165.898 CMAC_LOG_POWER_LEVEL_IS 508165.900 CMAC_LOG_RANGING_CONTINUE 508175.962 CMAC_LOG_RNG_REQ_TRANSMITTED 508175.964 CMAC_LOG_RNG_RSP_MSG_RCVD 508175.966 CMAC_LOG_RANGING_SUCCESS ranging_1_state 9610 28.0 dBmV (commanded) 0 0 2 2408 12018 20 33.0 dBmV (commanded) ranging_2_state 2 -64 11954 -9 31.0 dBmV (commanded) 12 Cisco IOS Release 12.0(3)T

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Troubleshooting Steps
12
Cisco IOS Release 12.0(3)T
Event
3—Obtain Upstream Parameters
The cable modem waits for an upstream channel descriptor (UCD) message from the headend
Cisco uBR7246. This is done to retrieve 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 cable modem’s transmit power. The cable modem performs ranging
in two stages: ranging state 1 and ranging state 2.
The field
CMAC_LOG_POWER_LEVEL_IS
is the power level that the Cisco uBR7246 told the cable
modem to adjust to. The field
CMAC_LOG_RANGING_SUCCESS
indicates that the ranging adjustment was
successful.
508148.062 CMAC_LOG_STATE_CHANGE
ranging_1_state
508148.064 CMAC_LOG_RANGING_OFFSET_SET_TO
9610
508148.066 CMAC_LOG_POWER_LEVEL_IS
28.0
dBmV (commanded)
508148.068 CMAC_LOG_STARTING_RANGING
508148.070 CMAC_LOG_RANGING_BACKOFF_SET
0
508148.072 CMAC_LOG_RNG_REQ_QUEUED
0
508148.562 CMAC_LOG_RNG_REQ_TRANSMITTED
508148.566 CMAC_LOG_RNG_RSP_MSG_RCVD
508148.568 CMAC_LOG_RNG_RSP_SID_ASSIGNED
2
508148.570 CMAC_LOG_ADJUST_RANGING_OFFSET
2408
508148.572 CMAC_LOG_RANGING_OFFSET_SET_TO
12018
508148.574 CMAC_LOG_ADJUST_TX_POWER
20
508148.576 CMAC_LOG_POWER_LEVEL_IS
33.0
dBmV (commanded)
508148.578 CMAC_LOG_STATE_CHANGE
ranging_2_state
508148.580 CMAC_LOG_RNG_REQ_QUEUED
2
508155.820 CMAC_LOG_RNG_REQ_TRANSMITTED
508155.824 CMAC_LOG_RNG_RSP_MSG_RCVD
508155.826 CMAC_LOG_ADJUST_RANGING_OFFSET
-64
508155.826 CMAC_LOG_RANGING_OFFSET_SET_TO
11954
508155.828 CMAC_LOG_RANGING_CONTINUE
508165.892 CMAC_LOG_RNG_REQ_TRANSMITTED
508165.894 CMAC_LOG_RNG_RSP_MSG_RCVD
508165.896 CMAC_LOG_ADJUST_TX_POWER
-9
508165.898 CMAC_LOG_POWER_LEVEL_IS
31.0
dBmV (commanded)
508165.900 CMAC_LOG_RANGING_CONTINUE
508175.962 CMAC_LOG_RNG_REQ_TRANSMITTED
508175.964 CMAC_LOG_RNG_RSP_MSG_RCVD
508175.966 CMAC_LOG_RANGING_SUCCESS