Orbi CBR750 Disconnecting

Question

My Orbi CBR750 modem keeps disconnecting. When we were using the COX modem everything was fine. The Orbi was fine until this past weekend. No firmware update on the modem. No splitter on the line.&nbsp;
My basic understanding of the Event Log codes show that it is something with the coax connection.
What else can I do besides changing the COAX?

Startup Procedure

Procedure
Status
Comment

Acquire Downstream Channel
381000000 Hz
Locked

Connectivity State
Ok
Operational

Boot State
Ok
Operational

Security
Enabled
BPI+

IP Provisioning Mode
Honor MDD
honorMdd(4)

Downstream Bonded Channels

Channel
Lock Status
Modulation
Channel ID
Frequency
Power
SNR
Correctables
Uncorrectable

1
Locked
QAM 256
33
357000000 Hz
7.3 dBmV
38.9 dB
0
0

2
Locked
QAM 256
34
363000000 Hz
7.4 dBmV
38.9 dB
0
0

3
Locked
QAM 256
35
369000000 Hz
7.3 dBmV
38.9 dB
1
0

4
Locked
QAM 256
36
375000000 Hz
7.3 dBmV
38.9 dB
0
0

5
Locked
QAM 256
37
381000000 Hz
7.3 dBmV
38.9 dB
0
0

6
Locked
QAM 256
38
387000000 Hz
7.3 dBmV
38.6 dB
0
0

7
Locked
QAM 256
39
393000000 Hz
7.1 dBmV
38.6 dB
2
0

8
Locked
QAM 256
40
399000000 Hz
6.8 dBmV
38.6 dB
0
0

9
Locked
QAM 256
41
405000000 Hz
6.3 dBmV
38.6 dB
0
0

10
Locked
QAM 256
42
411000000 Hz
5.8 dBmV
38.6 dB
0
0

11
Locked
QAM 256
43
417000000 Hz
4.5 dBmV
37.6 dB
8
0

12
Locked
QAM 256
44
423000000 Hz
1.5 dBmV
36.3 dB
86
60

13
Locked
QAM 256
45
429000000 Hz
-4.0 dBmV
33.3 dB
11303
22887

14
Locked
QAM 256
46
435000000 Hz
5.8 dBmV
35.5 dB
0
0

15
Locked
QAM 256
47
441000000 Hz
10.9 dBmV
38.9 dB
5
0

16
Locked
QAM 256
48
447000000 Hz
11.8 dBmV
38.9 dB
7
0

17
Locked
QAM 256
1
783000000 Hz
12.6 dBmV
38.6 dB
0
0

18
Locked
QAM 256
2
789000000 Hz
12.4 dBmV
38.6 dB
0
0

19
Locked
QAM 256
3
795000000 Hz
12.0 dBmV
37.6 dB
0
0

20
Locked
QAM 256
4
801000000 Hz
12.0 dBmV
38.6 dB
0
0

21
Locked
QAM 256
5
807000000 Hz
12.3 dBmV
38.6 dB
0
0

22
Locked
QAM 256
6
813000000 Hz
12.5 dBmV
38.6 dB
0
0

23
Locked
QAM 256
7
819000000 Hz
12.6 dBmV
38.9 dB
0
0

24
Locked
QAM 256
8
825000000 Hz
12.8 dBmV
38.6 dB
0
0

25
Locked
QAM 256
9
831000000 Hz
12.8 dBmV
38.6 dB
0
0

26
Locked
QAM 256
10
837000000 Hz
12.8 dBmV
38.6 dB
0
0

27
Locked
QAM 256
11
843000000 Hz
12.3 dBmV
37.6 dB
0
0

28
Locked
QAM 256
12
849000000 Hz
11.5 dBmV
37.3 dB
0
0

29
Locked
QAM 256
13
855000000 Hz
11.5 dBmV
37.6 dB
0
0

30
Locked
QAM 256
14
861000000 Hz
12.1 dBmV
37.6 dB
0
0

31
Locked
QAM 256
15
867000000 Hz
13.0 dBmV
38.6 dB
0
0

32
Locked
QAM 256
16
873000000 Hz
13.1 dBmV
38.6 dB
0
0

Upstream Bonded Channels

Channel
Lock Status
US Channel Type
Channel ID
Symbol Rate
Frequency
Power

1
Locked
ATDMA
6
2560 Ksym/sec
12900000 Hz
43.5 dBmV

2
Locked
ATDMA
1
5120 Ksym/sec
17700000 Hz
43.5 dBmV

3
Locked
ATDMA
2
5120 Ksym/sec
24100000 Hz
43.0 dBmV

4
Locked
ATDMA
3
5120 Ksym/sec
30500000 Hz
44.5 dBmV

5
Locked
ATDMA
4
5120 Ksym/sec
36900000 Hz
43.5 dBmV

6
Not Locked
N/A
Unknown
0 Ksym/sec
0 Hz
0.0 dBmV

7
Not Locked
N/A
Unknown
0 Ksym/sec
0 Hz
0.0 dBmV

8
Not Locked
N/A
Unknown
0 Ksym/sec
0 Hz
0.0 dBmV

Downstream OFDM Channels

Channel
Lock Status
Modulation/Profile ID
Channel ID
Frequency
Power
SNR/MER
Active SubcarrierNumber Range
UnerroredCodewords
CorrectableCodewords
UncorrectableCodewords

1
Locked
3
159
300000000 Hz
9.9 dBmV
43.3 dB
2216~5975
0
0
0

2
Not Locked
0
0
0 Hz
0.0 dBmV
0.0 dB
0~4095
0
0
0

Upstream OFDMA Channels

Channel
Lock Status
Modulation/Profile ID
Channel ID
Frequency
Power

1
Not Locked
0
0
0 Hz
0.0 dBmV

2
Not Locked
0
0
0 Hz
0.0 dBmV

Event Log

Time
Priority
Description

Jan 09 2023 21:08:52
Notice (6)
CM-STATUS message sent. Event Type Code: 5

Jan 09 2023 21:08:53
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:09:03
Notice (6)
CM-STATUS message sent. Event Type Code: 2

Jan 09 2023 21:09:08
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:09:10
Notice (6)
CM-STATUS message sent. Event Type Code: 5

Jan 09 2023 21:09:11
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:09:12
Notice (6)
CM-STATUS message sent. Event Type Code: 2

Jan 09 2023 21:09:15
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:09:17
Notice (6)
CM-STATUS message sent. Event Type Code: 5

Jan 09 2023 21:09:17
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:09:18
Notice (6)
CM-STATUS message sent. Event Type Code: 5

Jan 09 2023 21:09:23
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:09:23
Notice (6)
CM-STATUS message sent. Event Type Code: 5

Jan 09 2023 21:09:23
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:09:35
Notice (6)
CM-STATUS message sent. Event Type Code: 5

Jan 09 2023 21:09:36
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:09:50
Critical (3)
Unicast Ranging Received Abort Response - initializing MAC

Jan 09 2023 21:09:51
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:09:53
Notice (6)
CM-STATUS message sent. Event Type Code: 5

Jan 09 2023 21:09:54
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:09:55
Notice (6)
CM-STATUS message sent. Event Type Code: 2

Jan 09 2023 21:09:57
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:09:59
Critical (3)
Unicast Ranging Received Abort Response - initializing MAC

Jan 09 2023 21:09:59
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:10:01
Critical (3)
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out

Time Not Established
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Time Not Established
Critical (3)
Unicast Ranging Received Abort Response - initializing MAC

Time Not Established
Critical (3)
No Ranging Response received - T3 time-out

Time Not Established
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Time Not Established
Critical (3)
Unicast Ranging Received Abort Response - initializing MAC

Time Not Established
Critical (3)
SYNC Timing Synchronization failure - Loss of Sync

Jan 09 2023 21:12:24
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1

Jan 09 2023 21:12:24
Notice (6)
TLV-11 - unrecognized OID

Jan 09 2023 21:12:24
Critical (3)
Config File Rejected due to Invalid or Unexpected TLV 11

Jan 09 2023 21:12:28
Warning (5)
REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value

Jan 09 2023 21:12:28
Warning (5)
RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW

Jan 09 2023 21:12:28
Warning (5)
RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW

Jan 09 2023 21:12:30
Critical (3)
No Ranging Response received - T3 time-out

Jan 09 2023 21:12:38
Alert (2)
CM Certificate Error

Jan 09 2023 21:12:42
Notice (6)
CM-STATUS message sent. Event Type Code: 5

widermouthopen · Answer

The only thing that looks abnormal in the signal levels is some noise between 429-435Mhz which might be CDMA cellular interference/ingress. The logs show some errors with your channels losing sync and some T3/T4 errors. Do you have underground wiring from the street to the house? If so, could you describe it?

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Orbi CBR750 Disconnecting

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