2019-07-30,14:08:06 RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=d4:3f:cb:e1:54:35;CMTS-MAC=00:c1:b1:61:98:ed;CM-QOS=1.1;CM-VER=3.1;
2019-07-30,14:08:06 Dynamic Range Window violation
2019-07-30,14:08:06 RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=d4:3f:cb:e1:54:35;CMTS-MAC=00:c1:b1:61:98:ed;CM-QOS=1.1;CM-VER=3.1;
2019-07-30,14:08:06 RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=d4:3f:cb:e1:54:35;CMTS-MAC=00:c1:b1:61:98:ed;CM-QOS=1.1;CM-VER=3.1;
2019-07-30,14:08:06 Dynamic Range Window violation
This is coming from this modem:
D31CM-PEREGRINE-1.1.1.0-GA-03-NOSH; MODEL: CM8200A
Its connected to a cbr8
I've searched for this error, but haven't found a reasonable answer yet.
Thought I'd toss this to the real world guys before I open a case with Arris.
Any ideas?
ODG
Each US must have a transmit level contained within the shared 12dBmV window
If you show do "show cable modem 00:c1:b1:61:98:ed ver", you will see information such as
Upstream Channel : US8 US9 US10 US11
Reported Transmit Power (dBmV) : 36.00 35.25 34.75 37.00 <----- current transmit level
Max Dynamic ranging window (dBmV) : 41.50 41.50 41.50 41.50 <----- upper edge of 12dBmV window
Min Dynamic ranging window (dBmV) : 29.50 29.50 29.50 29.50 <----- lower edge of 12dBmV window
The log of the modem is telling me the commanded power is greater than 6db lower than the top of the DRW, yet the modem is about 2db lower according to the verbose output of the modem.
Here is a snippet of the log of one modem:
2019-07-31,08:36:52 RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=d4:3f:cb:e1:29:71;CMTS-MAC=00:ca:e5:3c:f2:42;CM-QOS=1.1;CM-VER=3.1;
2019-07-31,11:36:17 last event repeated 2159 times, up to this date/time
2019-07-31,11:36:37 DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=d4:3f:cb:e1:29:71;CMTS-MAC=00:ca:e5:3c:f2:42;CM-QOS=1.1;CM-VER=3.1;
2019-07-31,11:36:37 RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=d4:3f:cb:e1:29:71;CMTS-MAC=00:ca:e5:3c:f2:42;CM-QOS=1.1;CM-VER=3.1;
2019-07-31,14:01:24 last event repeated 1743 times, up to this date/time
Here are the stats for the same modem:
US Frequency Range Capability : Extended (5-85 MHz)
Extended Upstream Transmit Power : 54dB
Max CM Transmit Power (dBmV) : 65.00
Neq 1.6MHz Transmit Channels : 8
Max Transmit Channel Power (dBmV) : 55.97
Multi-Transmit Channel Mode : Y
Max US SC-QAMs Supported : 8
Number of US in UBG : 4
Minimum power load in DRW (dB) : 19.50
Max Dynamic ranging window (dBmV) : 36.25
Min Dynamic ranging window (dBmV) : 24.25
Upstream Channel : US0 US1 US2 US3
Ranging Status : sta sta sta sta
Upstream SNR (dB) : 35.18 36.12 35.18 36.12
Upstream Data SNR (dB) : 33.97 35.56 36.62 34.31
Received Power (dBmV) : 0.00 0.00 0.00 0.00
Data Burst resiliency suspended : N N N N
Reported Transmit Power (dBmV) : 33.75 33.75 34.75 34.50
Commanded Transmit Power (dBmV) : 33.75 33.75 34.75 34.50
Minimum Transmit Power (dBmV) : 17.00 17.00 17.00 17.00
Power Load (dB) : 22.22 22.22 21.22 21.47
Timing Offset (97.6 ns) : 3237 3237 3237 3237
Initial Timing Offset : 2981 2981 3237 2981
Rng Timing Adj Moving Avg(0.381 ns) : 0 0 0 0
Rng Timing Adj Lt Moving Avg : 0 0 0 0
Rng Timing Adj Minimum : 0 0 0 0
Rng Timing Adj Maximum : 0 0 0 0
Pre-EQ Good : 2007 2002 2004 2002
Pre-EQ Scaled : 0 0 0 0
Pre-EQ Impulse : 0 0 0 0
Pre-EQ Direct Loads : 0 0 0 0
Good Codewords rx : 4673861 5296248 7823565 7247709
Corrected Codewords rx : 416 261 1043 862
Uncorrectable Codewords rx : 25 4 19 18
Phy Operating Mode : atdma* atdma* atdma* atdma*
Does this only happen with that specific cable modem? We have seen that error sometimes with bad cables, plugs or other HF-problems within the network. Since the power levels can do change very fast in problematic environments its possible that the power level polling on your CMTS is too slow to see those spikes. Are you able to monitor the modem with with smaller timeframes?