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callanish9

join:2006-07-01
Las Vegas, NV

[NV] Uncomfortable with power levels.

Although I'm not experiencing disconnects and I'm pretty happy with speeds, I'm kind of concerned with my power levels on both downloads ( too many correctables ) and the high power levels of the upstream bonded channels.

Is there anything below to make me overly concerned or should I be contacting Cox with a request to get a tech engineer in to stabilize the numbers.

Do numbers that are out of whack put unnecessary stress on the cable modem? I'm on Cox's Premier Tier and the area has been upgraded to the 50MB speeds.

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 855000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File OK 161001_vm2.0_d.cfg
Security Enabled BPI+

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 88 855000000 Hz -8.6 dBmV 37.9 dB 57170 4022
2 Locked QAM256 85 837000000 Hz -8.6 dBmV 38.6 dB 49070 3742
3 Locked QAM256 86 843000000 Hz -8.6 dBmV 37.5 dB 51045 4344
4 Locked QAM256 87 849000000 Hz -8.6 dBmV 38.2 dB 52708 3851
5 Locked QAM256 93 861000000 Hz -8.3 dBmV 38.5 dB 41115 2761
6 Locked QAM256 94 867000000 Hz -8.7 dBmV 38.1 dB 50611 3677
7 Locked QAM256 95 873000000 Hz -8.3 dBmV 38.1 dB 45946 3209
8 Locked QAM256 96 879000000 Hz -8.4 dBmV 37.7 dB 49712 3672

Total Correctables Total Uncorrectables
397377 29278

Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 3 5120 Ksym/sec 23600000 Hz 51.0 dBmV
2 Locked ATDMA 2 5120 Ksym/sec 31700000 Hz 52.5 dBmV
3 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
4 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV

Thanks for any info!


bbeesley
VIP
join:2003-08-07
Richardson, TX
kudos:5

you aren't putting any "stress" on your modem. I ran an EMTA at 52db for years and it was fine

in fact, having levels at or near 50db can actually help improve your service because your the signal to noise ratio is increased for your return which is the most impacted by any noise in the plant.

that said, in Vegas it gets really hot in the summer and I have seen 3+db swings in return levels when things start to heat up and the AGCs in the amps struggle to keep up with the attenuation changes in the plant. This means what is 51db now could be closer to or above the 55db limit for the DOCSIS standard when it starts to warm up and at that point you will likely start to notice service impacts.

regarding your concern about correctable errors, I wouldn't worry too much. As long as the CMTS is able to correct for errors your service will be fine. What you want to watch out for is uncorrectable errors above around .1%...though you can't really see this from the modem, the Cox guys have tools to view this.

from what you describe, I wouldn't be too concerned. Just keep an eye on it as it gets warmer and if the return levels start to rise or if you start seeing lots of T3 or T4 errors each day or some other indication that your service is hinky like packet loss, then you are OK letting sleeping dogs lie


callanish9

join:2006-07-01
Las Vegas, NV

Okay, thanks for the reassurance. Just wanted to be better safe than sorry.

Regards
LTM