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Forum Discussion
CBR750 problem with connection and setup
Few things happened
STEP1: I had problems with internet over last 2 weeks. People during calls will complaint that i drop out. Xfinity came to check and replaced the cable but problem continues.
STEP2: I decided to do factory reset on my CBR750 and both satelites. After the restart i cannot setup it with mobile app. When i connect to wifi it is showing connected but no internet access (despite the fact that all 4 diodes are up).
STEP 3: I connected cable connection and i was able to get internet on my laptop. I setup modem/router via web interface but & selected same wifi/password. Ultimately my mobile phone is showing that it cannot connect to wifi (connection failed)
STEP4: factory reset again, cable connection to laptop, setup new wifi name & password -> at this moment my mobile can connect and access internet
STEP5: i don't want to change wifi setting for all 50 devices which i have at home. So i setup guest network with old login and password and some devices can connect while some others cannot (like my Samsung S22 phone or Roku TV)
It seems that factory reset is not really fully cleaning the modem...I manually updated firmware (same was installed before restart) and tried above steps multiple times. All the time same results...Any idea how to really fully clean CBR750? or what else to do to make sure it is working correctly?
thanks
16 Replies
What Firmware version is currently loaded?
Please post a copy and paste of the modems connection status and event log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-routerHow many RBS are deployed?
What is the size of your home? Sq Ft?
What is the distance between the router and 📡 satellite(s)? 30 feet or more is recommended in between RBR📡 and RBS🛰️ to begin with depending upon building materials when wired or wirelessly connected.
https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite 🛰️Does this happen with the RBS turned OFF?
Does this happen with both wireless and wired devices?
What channel configurations are currently set on the router?
Any Wifi Neighbors near by? If so, how many?Be sure to disable any MAC Address randomizers on phones and pads while at home:
https://community.netgear.com/t5/Orbi-App/NETGEAR-Mobile-Applications-and-Apple-Devices-FAQ/td-p/2220016/jump-to/first-unread-messagei am trying to reply but seems my replies get deleted 😞
i have 2 satellites but i didn't set them up till now. I cannot even setup main modem, not talking about satellites
i have 3500sq ft + basement, each floor has 1 orbi, aroun 20-30ft from each other
Wired seems to be working fine, wireless seems to be a problem
i am using auto channel for 2.4ghz and 48 channel for 5ghz
it is single family house, not sure if neighbours have netgear
i am thinking to maybe do factory reset through web menu, not sure if it makes any difference
connection is good now, below are the logs
Cable Diagnostic
Status: Good
Action: Your setup looks fine. If you are still experience an internet issue, the Netgear Cable Knowledge Base can provide additional troubleshooting info.
Internet Access: Good
Downstream Status: Good
Downstream Power Level: Good
Downstream SNR: Good
Upstream Status: Good
Upstream Power Level: Good
Current time: Mon Dec 11 18:48:58 2023Startup Procedure
Acquire Downstream Channel: 549000000 Hz Locked
Connectivity State: Ok Operational
Boot State: Ok Operational
Security: Enabled BPI+
IP Provisioning Mode: Honor MDD honorMdd(4)
Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM 256 42 447000000 Hz 7.5 38.6 0 0
2 Locked QAM 256 43 453000000 Hz 7.9 38.9 0 0
3 Locked QAM 256 44 459000000 Hz 7.5 38.9 0 0
4 Locked QAM 256 45 465000000 Hz 7.5 38.9 0 0
5 Locked QAM 256 38 471000000 Hz 7.8 38.9 0 0
6 Locked QAM 256 39 477000000 Hz 8.0 38.9 0 0
7 Locked QAM 256 40 483000000 Hz 8.0 38.6 0 0
8 Locked QAM 256 41 489000000 Hz 8.0 38.9 0 0
9 Locked QAM 256 32 495000000 Hz 8.3 38.9 5 0
10 Locked QAM 256 34 507000000 Hz 8.3 38.9 0 0
11 Locked QAM 256 35 513000000 Hz 8.3 38.9 0 0
12 Locked QAM 256 36 519000000 Hz 8.4 38.9 2 0
13 Locked QAM 256 1 525000000 Hz 8.4 38.6 0 0
14 Locked QAM 256 2 531000000 Hz 8.5 38.9 0 0
15 Locked QAM 256 3 537000000 Hz 8.5 38.6 0 0
16 Locked QAM 256 4 543000000 Hz 8.5 38.9 0 0
17 Locked QAM 256 5 549000000 Hz 8.6 38.9 0 0
18 Locked QAM 256 6 555000000 Hz 8.8 38.9 0 0
19 Locked QAM 256 7 561000000 Hz 8.8 38.6 0 0
20 Locked QAM 256 8 567000000 Hz 8.5 38.6 0 0
21 Locked QAM 256 9 573000000 Hz 8.9 38.6 0 0
22 Locked QAM 256 10 579000000 Hz 8.9 38.9 0 0
23 Locked QAM 256 11 585000000 Hz 8.9 38.6 0 0
24 Locked QAM 256 12 591000000 Hz 9.0 38.9 0 0
25 Locked QAM 256 13 597000000 Hz 9.0 38.9 0 0
26 Locked QAM 256 14 603000000 Hz 9.0 38.6 0 0
27 Locked QAM 256 15 609000000 Hz 9.1 38.6 0 0
28 Locked QAM 256 16 615000000 Hz 9.1 38.6 0 0
29 Locked QAM 256 17 621000000 Hz 9.3 38.9 0 0
30 Locked QAM 256 18 627000000 Hz 9.4 38.6 0 0
31 Locked QAM 256 19 633000000 Hz 9.4 38.6 0 0
32 Not Locked N/A 0 0 Hz 0.0 0.0 0 0
Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 4 5120 16400000 Hz 43.3
2 Locked ATDMA 3 5120 22800000 Hz 43.0
3 Locked ATDMA 2 5120 29200000 Hz 42.8
4 Locked ATDMA 1 5120 35600000 Hz 43.3
5 Locked ATDMA 10 2560 40400000 Hz 40.3
6 Not Locked N/A 0 0 0 Hz 0.0
7 Not Locked N/A 0 0 0 Hz 0.0
8 Not Locked N/A 0 0 0 Hz 0.0
Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Locked 3 37 762000000 Hz 11.5 dBmV 39.4 dB 1108~2987 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 LockedStatus ProfileID ChannelID 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
Dec 31 1969 18:01:02 Error Missing Mandatory MDD TLV on primary DS Channel
Dec 31 1969 18:01:25 Critical No Ranging Response received - T3 time-out
Dec 11 2023 17:01:30 Warning MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Dec 11 2023 17:01:30 Notice TLV-11 - unrecognized OID
Dec 31 1969 18:01:02 Critical No Ranging Response received - T3 time-out
Dec 31 1969 18:01:05 Warning RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW
Dec 11 2023 17:43:48 Warning MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Dec 11 2023 17:43:48 Notice TLV-11 - unrecognized OID
Dec 11 2023 17:44:22 Critical Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
Dec 11 2023 17:44:22 Warning TCS Partial Service
Dec 31 1969 18:01:04 Critical No Ranging Response received - T3 time-out
Dec 31 1969 18:01:08 Warning RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW
Dec 11 2023 17:57:44 Warning MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Dec 11 2023 17:57:44 Notice TLV-11 - unrecognized OID
Dec 31 1969 18:01:01 Critical No Ranging Response received - T3 time-out
Dec 31 1969 18:01:09 Warning RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW
Dec 11 2023 18:26:52 Warning MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Dec 11 2023 18:26:52 Notice TLV-11 - unrecognized OIDWhat FW version is loaded on the CBR unit and RBS's? You need to make sure the RBS are using same level FW version as what's on the CBR unit:
For that size of home, you really only need the CBR unit and just one RBS.
I would turn OFF one of the RBS and test. Too Much Wifi: https://youtu.be/UR0viMLISz4
Try setting manual channel 1, 6 or 11 for 2.4Ghz.
Cable modem is ok however the power on the down is too high:
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
Need to ask the ISP to turn the power down a bit to fit better into specs. Or install a coax able line splitter or a -3db coax line attenuator.
Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.
