UBR setting for Verizon West ATM-based 3.0/768 speed

Hello all,

What are other people using for the UBR setting on the VC's for the 3.0/768
speed of Verizon's? I've found that if my settings don't match Verizon's
pretty closely, things slow to a crawl. And I'm not talking like they slow
to the slower of the two speed definitions. If a Verizon DSL customer has a
768/128 line, and I set their VC for UBR 1664, it works at less than modem
speeds.

Anyhow, early, on, Verizon gave me the following UBR values to plug into my
router. For example, here are a few of the VC classes:

vc-class atm 768-128-fr
  ubr 954
  no ilmi manage
  encapsulation aal5snap
  transmit-priority 3
!
vc-class atm 384-384-fr
  ubr 477
  no ilmi manage
  encapsulation aal5snap
  transmit-priority 3
!
vc-class atm 768-128-atm
  ubr 864
  no ilmi manage
  encapsulation aal5snap
  transmit-priority 3
!
vc-class atm 1.5-128-atm
  ubr 1664
  no ilmi manage
  encapsulation aal5snap
  transmit-priority 3

I was actually given these values for UBR by Verizon way back when. And
again, if I have it set just a little bit off, it all but destroy's the
speed. I've asked SEVERAL people there what the UBR value should be for
3.0/768, and gotten no good answer. Currently I'm using UBR 3360, but
that's just an educated guess. What are others using?

I 'd like to make sure that everything is working optimally for the
customers.

I'm also double-checking this value because I've currently got a really
wacko support issue open with a customer. They recently switched from a
Fujitsu platform to a Westell platform, and upped their speed from 1.5/384
to 3.0/768. Since they did that, if the customer send a bunch of SMTP
traffic, his connection dies, and only a reboot of the modem fixes it.
Other outbound traffic like heavy FTP transfers is NOT triggering it. It
started before the speed change, but AFTER the change to the Westell
platform. We've tried two modems and power supplies. I'm stumped and
grasping for straws...

Thanks,

Rick Kunkel
Worldlink DSL Department
(206)361-8785

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Received on Tue Apr 5 13:35:19 2005