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Bruafekkay Posted:
agreed dingy
anybody, obviously
if the quarters is
not provided with
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Bruafekkay Posted:
agreed drab
individual, large
if the hamlet is
not provided with
the requisite
...

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tplink Posted:
Im trying to add
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DWSupport Posted:
After recent
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peterlee Posted:
Had a call from a
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Ontario to my home
in
Scarborough, Onta
rio
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I am looking for a
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HildBeft Posted:
You can recollect
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and open the
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Great tips..
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massrman Posted:
The devices are
available at
different price
margins , please
share your
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massrman Posted:
Hi these are most
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mg77
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Joined: Dec 09, 2008
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PostPosted: Tue Dec 09, 2008 3:10 pm    Post subject: Choppy/missing upstream audio on new Comcast connection Reply with quote Back to top

Hi everyone,

Recently moved into a new place and had Comcast High Speed Internet installed. 6 MB download / 3 MB upload. I am using a Motorola SB5120 modem. Connected to that is my RT31P2 Vonage adapter, and connected to that is my Acer Aspire One laptop.

Web browsing can be slow although the speed tests show consistently high download speeds. My Vonage service does not work (I can hear people, but they can't hear me / can only sometimes hear me).

I called Vonage tech support, who after having me run a test (showing 37% quality of service) suggested that the problem was on Comcast's end. He brought a Comcast tech into the call.

The Comcast guy suggested I connect my computer straight to the cable modem to see if the problem was there. (He also warned me to turn off my computer before switching the Ethernet cable because it might "shock my NIC" .. Vonage guy and I both said we had never heard of this happening..)

The problem was still there (30-40% quality of service on the mycooltools.com test). Comcast guy then
1) Said my download speed on the test (12 mps) was fine so it wasn't comcast's problem
2) Guaranteed me I wouldn't have these problems if I used Comcast Digital Voice, because "Comcast voice packets get prioritized".

Vonage guy then told Comcast guy that it was a problem with Quality of Service.
Comcast Guy: "I don't know what that means."

And on and on and on. Comcast guy refused to transfer to supervisor, tried to sell me Comcast digital voice 5 more times. He asked to call me back 10 minutes later. Comcast guy then called back, and said his supervisor said "Vonage can make you believe whatever you want with their websites".

This all went on for far too long, Comcast is sending someone over tomorrow but I wanted to ask if anybody else was having this kind of problem, or had any ideas.

These are my speed test results from this afternoon (fairly quiet time in this neighborhood, probably not too many people online):

Download speed 3370 Kbps (socket test)
Upload speed 3094 Kbps (socket test)
Quality of service 75 %
Maximum delay 141 ms
Round trip time 57 ms
Upstream jitter 2.6 ms
Upstream packet loss 0 %
Upstream packet order 100 %
Upstream discards 0 %
Downstream jitter 2.3 ms
Downstream packet loss 0 %
Downstream packet order 100 %
Downstream discards 0 %

The test I was using yesterday at the request of the Vonage tech (http://myspeed.visualware.com/servers/iad.html) gives me this today:

Download speed 10512 Kbps
Upload speed 3102 Kbps
QOS 60 %
RTT 21 ms
Max Delay 247 ms
Avg Delay 2 ms
Max Bandwidth 27200 Kbps
Route Speed 24965 Kbps
Forced Idle 20 %
Route Conc 2.5
Download test s
Upload test s

The Vonage tech also had me ping a server and do a traceroute. So far it seems that the problem is on Comcast's end. Any ideas ?? Vonage service is still unusable for me and I'm a 3 year customer (worked just fine for me w/ same equipment on another provider's network in Florida)
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Slyster
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Joined: Sep 26, 2008
Posts: 81

PostPosted: Tue Dec 09, 2008 5:49 pm    Post subject: Reply with quote Back to top

A little rundown on QOS

http://technet.microsoft.com/en-us/library/cc757120.aspx

http://www.wisegeek.com/what-is-qos.htm
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VonTechMgr
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Joined: Jan 02, 2008
Posts: 656
Location: NJ

PostPosted: Tue Dec 09, 2008 8:22 pm    Post subject: Reply with quote Back to top

Is this the same cable modem you used in the previous location with the other ISP that had no issues with Vonage or did you get this modem from Comcast? Some SB5120's are known to cause audio issues based upon the firmware they have and the location they were manufactured in. Again not all of them do this but some do. What are the signal levels inside the modem. Comcast can check this remotely but you can do it yourself by going to http://192.168.100.1 and click on the Signal tab. Post everything listed in here.

Also just want you to know that bandwidth has little say in voice quality. You can run a bandwidth test and have the entire internet at your back door yet still have poor audio. The internet uses the BGP protocol to get from point A to point B. Each ISP or even the same ISP in different locations may use a different route to get to a destination. It all depends upon your IP address, the network you belong to, and the ASN being advertised.

While Comcast does have a direct IP handoff to the Vonage border routers, not every Comcast ASN is being broadcasted to Vonage and vice versa. So you could have packet loss between your location and the Vonage data centers with your current connection especially if Comcast has you routing through an overcrowded, saturated backbone.


Last edited by VonTechMgr on Tue Dec 09, 2008 8:35 pm; edited 1 time in total
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kamnet
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Joined: Sep 12, 2005
Posts: 229
Location: Mt. Sterling, KY

PostPosted: Tue Dec 09, 2008 8:29 pm    Post subject: Reply with quote Back to top

I would agree with you and the Vonage tech, the problem appears to be on Comcast's side. I'm sure the Comcast technician that comes out tomorrow will be very straight-forward and not put up such a bullcrap front.
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doglover
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Joined: Mar 14, 2008
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PostPosted: Sun Dec 28, 2008 2:19 am    Post subject: Reply with quote Back to top

Here is the results from my 5120. What should the downstream power level be?


Downstream Value
Frequency 585000000 Hz
Signal to Noise Ratio 35 dB
QAM QAM256
Network Access Control Object ON
Power Level 0 dBmV
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
Upstream Value
Channel ID 1
Frequency 37400000 Hz
Ranging Service ID 1130
Symbol Rate 2.560 Msym/s
Power Level 47 dBmV
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ed56
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Joined: Jun 08, 2007
Posts: 832

PostPosted: Sun Dec 28, 2008 7:55 am    Post subject: Reply with quote Back to top

doglover wrote:
Here is the results from my 5120. What should the downstream power level be?


Downstream Value
Frequency 585000000 Hz
Signal to Noise Ratio 35 dB
QAM QAM256
Network Access Control Object ON
Power Level 0 dBmV
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
Upstream Value
Channel ID 1
Frequency 37400000 Hz
Ranging Service ID 1130
Symbol Rate 2.560 Msym/s
Power Level 47 dBmV


see http://www.speedguide.net/read_articles.php?id=1197

_________________
Time Warner Road Runner / Motorola SB5101 Cable Modem / Lniksys E2000 / Vonage VDV21
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VonTechMgr
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Joined: Jan 02, 2008
Posts: 656
Location: NJ

PostPosted: Sun Dec 28, 2008 10:05 am    Post subject: Reply with quote Back to top

This web page has very good information about cable modem signal / power levels and diagnostics.

http://homepage.ntlworld.com/robin.d.h.walker/cmtips/signal.html
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duckk
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Joined: Jan 18, 2009
Posts: 1

PostPosted: Sun Jan 18, 2009 12:21 pm    Post subject: Reply with quote Back to top

I have the same problem. I had the same experience with Comcast and Vonage on the phone. It went around and around we got no where. What was the outcome to the tech coming out? Please post your results. Any help would be a great thing.


Downstream Value
Frequency 519000000 Hz
Signal To Noise Ratio 37.0 dB
Power Level 2.8 dBmV

Upstream Value
Channel ID 1
Frequency 33200000 Hz
Power 25.3 dBmV
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