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pbert's avatar
pbert
Aspirant
Nov 10, 2021
Solved

CBR750 not connecting to RCN

I just got a CBR750 second hand and am having trouble connecting to RCN. When the router boots up it gets to the final "online" light flashing but that light never turns solid. I've noticed the light...
  • pbert's avatar
    pbert
    Nov 17, 2021

    Thanks for the help. RCN had to send a technician out and he said the power levels were a little high (~12 [dBmV I assume]). He was able to get it working, though.

FURRYe38's avatar
FURRYe38
Guru - Experienced User
Nov 11, 2021

Please post a copy and paste of the modems connection status page.


Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box. 
Be sure your using good quality RG6 coax cable up to the modem. 
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853

pbert's avatar
pbert
Aspirant
Nov 11, 2021

Thanks for the reply. The coax cable does have a splitter right before connecting to the service box. If I can't get it working otherwise, do you think a female to female adapter would be OK or does it need to be one cable from the service box to the modem? We do not use the other cable running from the splitter it can definitely be removed.

 

I tried a full power off and power up cycle a few times, but still no solid online light. I also tried upgrading to the latest firmware (4.6.5.8).

 

Is this the connection status you were referring to?

Spoiler
Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel363000000 HzLocked
Connectivity StateIn ProgressNot Synchronized
Boot StateIn ProgressUnknown
SecurityDisabledDisabled
IP Provisioning ModeIn ProgressUnknown
Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectable
1LockedQAM 25617363000000 Hz7.5 dBmV40.9 dB00
2Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
3Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
4Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
5Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
6Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
7Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
8Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
9Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
10Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
11Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
12Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
13Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
14Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
15Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
16Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
17Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
18Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
19Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
20Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
21Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
22Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
23Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
24Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
25Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
26Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
27Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
28Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
29Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
30Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
31Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
32Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA25120 Ksym/sec30350000 Hz40.5 dBmV
2Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
3Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
4Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
5Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
6Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
7Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
8Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
Downstream OFDM Channels
ChannelLock StatusModulation/Profile IDChannel IDFrequencyPowerSNR/MERActive Subcarrier
Number Range		Unerrored
Codewords		Correctable
Codewords		Uncorrectable
Codewords
1Not Locked000 Hz0.0 dBmV0.0 dB0~4095000
2Not Locked000 Hz0.0 dBmV0.0 dB0~4095000
Upstream OFDMA Channels
ChannelLock StatusModulation/Profile IDChannel IDFrequencyPower
1Not Locked000 Hz0.0 dBmV
2Not Locked000 Hz0.0 dBmV
Current System Time: Thu Jan 1 00:11:02 1970System Up Time 00:10:58 
  • FURRYe38's avatar
    FURRYe38
    Guru - Experienced User
    Nov 11, 2021

    Ya remove the splitter. A barrel connector can work. 

     

    Um, you only have 1 channel locked in for both UP and Down. There should be more channels locked in. 

    Power maybe high on the 1 channel. 

     

    You need to contact your ISP and have them check your line and check the connections status page on the CBR. You should have several Download Channels locked in.