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Spectator

Need advice about modem's connection status - signal levels

Columbus, OH -- standard internet 15mbps -- apartment complex -- Last week I was unable to connect internet. Since I had an old docsis 2 motorola modem, TWC replaced it with technicolor TC4310. Replacing the modem didn't resolve the issue, therefore a technician came and worked on apartment's cable box and checked my line. Now I can access internet but even speed test results are fine, connection seems not stable as before (slower page loading and much more freezing with video calls and watching live streams). 

Modem connection status page shows 12 of 16 downstream channels are locked and I am wondering if this is normal (please see below for modem status logs). Should all 16 downstream channels be locked? I did some research on internet but still I am not sure if signal levels are fine.

 

Information
Standard Specification Compliant DOCSIS 3.0
Hardware Version 1.0
Software Version STF8.20.02

 

Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel Locked
Connectivity StateOKOperational
Boot StateOKOperational
Configuration FileOK 
SecurityEnabledBPI+

 

Downstream Channel
ChannelLock StatusModulationChannel IDSymbol RateFrequencyPowerSNR
1LockedQAM25625360537621000000 Hz-1.0 dBmV40.2 dB
2LockedQAM25615360537615000000 Hz-0.8 dBmV39.4 dB
3LockedQAM25635360537627000000 Hz-1.2 dBmV40.2 dB
4LockedQAM25645360537633000000 Hz-1.2 dBmV40.2 dB
5LockedQAM25655360537639000000 Hz-1.6 dBmV40.1 dB
6LockedQAM25665360537645000000 Hz-1.3 dBmV40.2 dB
7LockedQAM25675360537651000000 Hz-1.6 dBmV40.0 dB
8LockedQAM25685360537657000000 Hz-2.7 dBmV39.9 dB
9LockedQAM25695360537663000000 Hz-2.7 dBmV39.7 dB
10LockedQAM256105360537669000000 Hz-3.0 dBmV39.7 dB
11LockedQAM256115360537675000000 Hz-3.8 dBmV35.8 dB
12LockedQAM256125360537681000000 Hz-3.5 dBmV38.0 dB
13Not LockedUnknown0Unknown 0.0 dBmV0.0 dB
14Not LockedUnknown0Unknown 0.0 dBmV0.0 dB
15Not LockedUnknown0Unknown 0.0 dBmV0.0 dB
16Not LockedUnknown0Unknown 0.0 dBmV0.0 dB

 

Upstream Channel
ChannelLock StatusModulationChannel IDSymbol RateFrequencyPower
1LockedQAM16915120 Ksym/sec30600000 Hz28.8 dBmV
2LockedQAM16892560 Ksym/sec19400000 Hz28.0 dBmV
3LockedQAM16905120 Ksym/sec24200000 Hz28.5 dBmV
4LockedQAM16922560 Ksym/sec37000000 Hz28.3 dBmV

 

SNMP Log

Time  Priority  Description 
 Mon Sep 05 00:57:30 2016   Critical (3)  Started Unicast Maintenance Ranging - No Response received - ... 
 Time Not Established  Error (4)  Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=70:5a:... 
 Time Not Established  Error (4)  Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=70:5a:... 
Everyone's Tags (2)
3 REPLIES 3
Expert

Re: Need advice about modem's connection status - signal levels

just because you have an 8,16,24 or 32 ch modem doesn't mean there's that many QAM modem channels on the system.

 

Ohio had 4 then went to 8 and presently 12. In many areas, However the loading is light and 12 channels is plenty.  I do see there are 7 more channels, 4 of which are sitting idle and ready to be activated, however the 7 are all in the 4G LTE band and ingress is a major issue as Ohio's infrastructure is 30+ years old (40 here) and needs to be replaced.

 

Spectator

Re: Need advice about modem's connection status - signal levels

Thanks for the reply.

Expert

Re: Need advice about modem's connection status - signal levels

Your upstream levels are a little off(a bout 10 dB lower than optimal) but that may be new amplifiers out on the street, nothing to worry about.  Eventually the bucket truck crew will get around to ballancing the levels better. It's not affecting the channels downstream.

 Our old 40 year old crap up here runs upstream in the +45 to +50 dBmv range and there's no room to add more than a 2 way splitter and keep the upstream in range and levelled...Woman Sad

(supposedly done to reduce upstream noise) but the amps are so old that they don't have active reverse, return, or upstream amps.