This forum includes tips for maintaining the best audio quality possible with the Ooma System. If your Ooma system is having issues with dropped calls, static audio or echo, look here for assistance.
#68238 by amkarr
Wed Nov 03, 2010 4:01 pm
I've had Ooma for about 4 months. For the first few months it was fine. Now people tell me my voice cuts in and out so bad to the point where I haven't used the box in about 2-3 weeks.

I have Comcast, generally get about 18 mbs download and 2 mbs upload when I run the speed test. The problem as I can see from running the Visualware test is that my jitter is really high (in the hundreds). Ooma says that's the source of my problem.

My setup is modem-Ooma-router. It's a CM100 modem, Ooma Core, and Asus WL500GP V2 router.

I've tried the optimizations/tricks I've found the web (QOS, Use Built in Modem Port MAC address) but they're not helping.

What I cannot understand about jitter is where the problem is. Is it the modem or ISP?

Ooma tells me it's Comcast's fault and no one I've talked to so far at Comcast knows what I'm talking about. Comcast also pinged my modem and said it appeared to be working fine.

Help?
#68247 by lbmofo
Wed Nov 03, 2010 6:30 pm
Your modem might be going belly up. Or your cable line may have changed in your neighborhood. Try doing a hard reset of your modem. There is a button for the reset or you would have to go into the modem setup page and do a restore factory setting and restart.
#68264 by murphy
Thu Nov 04, 2010 2:00 am
It also could be out of range signal levels, too low or too high, on the incoming cable.
Try connecting to 192.168.100.1 and see what the incoming signal level and SNR and the outgoing power level are.
#68269 by lbmofo
Thu Nov 04, 2010 6:55 am
murphy wrote:It also could be out of range signal levels, too low or too high, on the incoming cable.
Try connecting to 192.168.100.1 and see what the incoming signal level and SNR and the outgoing power level are.

Info: viewtopic.php?f=4&t=6679&start=10#p48356
#68288 by amkarr
Thu Nov 04, 2010 1:29 pm
Results from WhichVoip:

VoIP test statistics
--------------------
Jitter: you --> server: 24.2 ms
Jitter: server --> you: 18.5 ms
Packet loss: you --> server: 0.0 %
Packet loss: server --> you: 0.0 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Estimated MOS score: 3.8

Speed test statistics
---------------------
Download speed: 12884624 bps
Upload speed: 1822136 bps
Download quality of service: 77 %
Upload quality of service: 84 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 85 ms
Average download pause: 2 ms
Minimum round trip time to server: 32 ms
Average round trip time to server: 45 ms
Estimated download bandwidth: 22400000bps
Route concurrency: 1.7385063
Download TCP forced idle: 48 %
Maximum route speed: 16383744bps
#68293 by lbmofo
Thu Nov 04, 2010 1:49 pm
Those are some ugly looking jitter values. Did you do a reset of your modem? Can you do what Murphy was asking and post the values here on the modem readings?
#68294 by amkarr
Thu Nov 04, 2010 1:52 pm
I reset the modem. Now I'm getting 42 ms jitter on whichvoip, 28.1 ms on the visualware site. Should I just go buy a new modem?
Last edited by amkarr on Thu Nov 04, 2010 1:57 pm, edited 1 time in total.
#68296 by amkarr
Thu Nov 04, 2010 1:55 pm
From 192.168.100.1:


Acquire Downstream Channel 723000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enabled BPI+


Downstream Channel


Lock Status Operational
Modulation 256QAM
Channel ID 2
Provisioned Rate Unlimited
Symbol Rate 41879.195 Ksym/sec
Downstream Power 8.0 dBmV
SNR 36.0 dB


Upstream Channel


Lock Status Operational
Modulation 16QAM
Channel ID 12
Provisioned Rate Unlimited
Symbol Rate 2560 Ksym/sec
Upstream Power 42.0 dBmV

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