It may be that the line is too noisy to support the speed your ISP has
set it to. You can ask your ISP to reduce the speed to get better link
quality; ie 3mbit instead of 5mbit
---
Simon P. Ditner
On 2010-04-04, at 11:03 AM, Darryl Moore <[email protected]> wrote:
Thanks David. Excellent point. I'll do that, but none the less, I'm
pretty sure I haven't been maxing my upstream bandwidth.
I'm pretty sure it's the DLAM which is introducing the latency
issue, so
the only control I have to deal with it is through jitter buffers,
and I
don't control the buffer at the other end.
FYI I've done a little ping testing of both my DSL line and some of my
clients' cable connections with 5 different remote servers including 2
VOIP providers. Here is a summary of the last two hours of mine and
one
of my clients. (all times are in mS)
DSL
------------ Google ISP DNS VOIP VOIP
Latency(min) 31 8 91 12 17
Latency(max) 132 105 313 111 103
Latency(avr) 47 20 109 24 29
Jitter(max) 89 96 112 98 85
Pkt Loss(max) 0 0 0 0 5
MOS(min) 3.7 3.8 3.0 3.7 3.8
cable
------------ Google ISP DNS VOIP VOIP
Latency(min) 35 12 19 15 15
Latency(max) 62 25 26 20 20
Latency(avr) 38 13 20 15 15
Jitter(max) 22 12 7 5 5
Pkt Loss(max) 0 0 0 0 0
MOS(min) 4.1 4.2 4.2 4.2 4.2
As you can see the cable is rock solid, but the DSL has a lot of
jitter,
and this is a fairly good sample for the DSL.
On Sun, 2010-04-04 at 10:10 -0400, David Cook wrote:
Darryl, one other point.
Make sure you are setting your max outbound bandwidth ~10% less
than your
actual upstream bandwidth. If you _ever_ max this connection, the DSL
modem will buffer your packets and all QoS is for naught.
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