From: Hansang Bae (hbae@xxxxxxxxxx)
Date: Mon Apr 29 2002 - 23:58:17 GMT-3
At 09:55 AM 4/29/2002 -0400, Church, Chuck wrote:
> We've recently installed a clear channel DS3 between offices using
>Adtran T3SU 300s and 3662 routers with HSSI. We're only getting about half
>a meg of throughput. We're using all timeslots and not getting errors. It
>was setup with PPP encapsulation. Is there any problem with running PPP
>over a T3? Also, using PPP forced it into doing fair queuing, which I know
>Cisco doesn't recommend for anything over E1 speed. Should I give HDLC a
>try, or is there something else I should look at first? This is my first
>experience with a T3, so I'm a little unfamiliar with the 'sh controller'
>output.
Barring hardware and framing issues (make sure you're CBIT all they way through
)..
What is the round-trip ping time between the two sites? If it's over 25msec,
you're going to have problems due to TCP not being able to fill the pipes. You
need to look up two RFCs: RFC1323 and 2018 (possibly 2883)
One quick way to see if you have this problem is to run 10 TTCP sessions betwee
n the routers. Each and every one will be able to get the 1/2 Mbps throughput
, but no one session will be able to exceed the limit of 1/2 Mbps (this number
is a function of latency/distance)
hsb
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