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Surboard stuck in blinking send light in blue color with power light and receive light constant gree

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New Poster

Surboard stuck in blinking send light in blue color with power light and receive light constant gree

I have a surfboard SB6121 modem. Since I have connected a new router (Linksys Max-Stream AC2200 MU-MIMO Tri-band Wireless Router), the modem randomly goes to a state where it has blinking send light in blue color with power light and receive light constant green. 

I had to do 4-5 power recycles to get it fixed. When doing power recycle, I had to disconnect coaxial and ethernet cables. 

I am not sure what is going on with my modem.

Any help in debugging the issue?

Expert

Re: Surboard stuck in blinking send light in blue color with power light and receive light constant

What do the modem's signal stats look like ? Try getting them here; http://192.168.100.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.




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New Poster

Re: Surboard stuck in blinking send light in blue color with power light and receive light constant

Please see the attached the details.

 

Screen Shot 2018-04-08 at 1.27.02 PM.png
New Poster

Re: Surboard stuck in blinking send light in blue color with power light and receive light constant

Note that I have changed the coaxial cables too, still in vain.

Expert

Re: Surboard stuck in blinking send light in blue color with power light and receive light constant

The downstream power is weak, the SNR's are low, and the upstream power is too high / out of spec and it may be intermittently fluctuating even higher out of spec. That can cause random disconnects, spontaneous re-booting of the modem, and speed and latency problems.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.




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We ask that you post publicly so people with similar questions may benefit from the conversation.

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