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Vonage I have 384 Kbps upload cap, and I can reliably get that. My modem is a Motorola SB4100.
I have 384 Kbps upload cap, and I can reliably get that. My modem is a Motorola SB4100. So there's plenty of upload speed to support 1 (or even 3) Vonage lines. The problem is simply when there's a TCP connection from a computer behind the router that's uploading... I can see the TCP sawtooth on the Network monitor as the connection hunts for the maximum available outgoing bandwidth (and the limiting factor on the outgoing bandwidth is not somewhere in the middle of the internet but the very first (or maybe second) hop-the 384 Kbps upload restriction is the limiter). If the TCP connection is active when there's no phone call, it will average exactly around the 384 kbps maximum, sawtoothing slightly above and below. And when I place a call it will sure back off and drop down to an average of around 270-280 kbps... which would seem right in line with what you'd expect when it competes with a constant stream of one-way ~100kbps UDP RTP traffic that has no congestion control.
This is just theorizing on my part, but my guess is that the very periodic dropouts the call recipient will hear are due to the peaks of the TCP connection as it exceeds its average rate and goes up to about 330 kbps before backing off-this extra traffic either causes packet loss or excessive queuing delay for the Vonage RTP traffic. I personally don't know how the router's QoS functions and how it integrates, if at all, with the cable modem's and/or Comcast's handling of prioritized packets. My instinct is that the WRTP54G is unaware of the maximum upload bandwidth limit, and so it's QoS simply amounts to making sure the Voice traffic Queue has priority over the data traffic queues, but because the router sees a 10 Mbps or 100 Mbps ethernet connection to the Cable modem, it's more than happy to allow more than 384 Kbps (the combination of the Vonage traffic and the TCP connection's periodic peaks of its sawtooth congestion control) pass on to that. And at the Cable modem (or perhaps one hop down at the cable office, wherever rate limits are enforced) it either ignores or doesn't optimally handle QoS headers, and that's where the outgoing call quality degrades.
So that's my conjecture; summed up, it's basically that the only reason the TCP file upload connection backs off at all is due to its end-to-end congestion control algorithm and not any router QoS handling, since the router is unaware of the actual bandwidth limit it's ineffective. There's a more than excellent chance that I'm way off, so I'd love if someone who knows can explain how this QoS is supposed to work. My guess is I'd have no problem if I could just configure the router to rate limit all outgoing non-Voice traffic to a maximum of 384-110= 274 Kbps whenever a call is active. But without a BSD or Linux box sitting between the router and the cable modem, I'm not sure that's ever going to be possible.
Read The Full Thread: WRTP54G Version 1.00.37 Firmware Now Available
• During a call to a very competent Vonage tech (well, actually it was to a very incompetent
• and if someone wants to download it manually and see if the wrtp allows manual firmware
• I can verify that it does; I had to manually upgrade from 1.00.18 to 1.00.29. Assuming
• Anyone know where the image is posted? I tried the location listed above but could
• I just checked and my router pulled the updated firmware down without any intervention
• Mpod, what are your caps on the Comcast cable? the reason I ask is because Vonage
• Before you all rush to run an update, you might want to first check your status.
• Hi I manualy downloaded the latest firmware from the vonage website as detailed
• Mine upgraded to 1.00.37 on its own. I don't know what it fixed but I didn't have
mpod posted "I have 384 Kbps upload cap, and I can reliably get that. My modem is a Motorola SB4100." on 07/06/2005 |
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