nanog mailing list archives
Re: MCI [ATM overhead]
From: avg () postman ncube com (Vadim Antonov)
Date: Wed, 20 Mar 1996 12:10:13 +0800
Jim Forster <forster () cisco com> wrote:
He's talking about the overhead due to carrying variable length IP packets in fixed length ATM cells.
...
There's beginning to be some expectation that there will be a transmission capacity crunch in the carrier's Sonet nets, and this ~25% ATM cell tax may be looked at carefully as packet over Sonet solutions emerge.
Given the bimodailty of IP traffic size distribution (about 40% of packets are small, like TCP ACKs or telnet/rlogin keystrokes) the ATM "cell tax" is closer to 32%. I.e. a dual clearline DS-3 actually carries as much user data as OC-3c ATM. Which, incidentally, was why SprintLink backbone design is easily expandable to dual links (that includes carefully considering implications for routing). Sean presented that design on NANOG a year ago, BTW. Funny thing, the design is expandable beyond that, too, so OC-3 ATM is already obsolete. --vadim
Current thread:
- Re: MCI [ATM overhead] Jeff Ogden (Mar 19)
- Re: MCI [ATM overhead] Gordon Cook (Mar 19)
- Re: MCI [ATM overhead] Gary R Wright (Mar 19)
- Re: MCI [ATM overhead] Jim Forster (Mar 19)
- <Possible follow-ups>
- Re: MCI [ATM overhead] Paul Ferguson (Mar 19)
- Re: MCI [ATM overhead] Wolfgang Henke (Mar 19)
- Re: MCI [ATM overhead] John Cavanaugh (Mar 20)
- Re: MCI [ATM overhead] Wolfgang Henke (Mar 20)
- Re: MCI [ATM overhead] Paul Ferguson (Mar 20)
- Re: MCI [ATM overhead] Mark A. Luker (CISE/NCRI) (Mar 22)
- Re: MCI [ATM overhead] Vadim Antonov (Mar 20)
- Re: MCI [ATM overhead] Shikhar Bajaj (Mar 20)
- Re: MCI [ATM overhead] Tim Salo (Mar 20)
- Re: MCI [ATM overhead] Jon Zeeff (Mar 21)
- Re: MCI [ATM overhead] William Allen Simpson (Mar 21)
- Re: MCI [ATM overhead] Shikhar Bajaj (Mar 21)
- Re: MCI [ATM overhead] Shikhar Bajaj (Mar 21)
- Re: MCI [ATM overhead] Tim Salo (Mar 21)
- Re: MCI [ATM overhead] Jeff Ogden (Mar 21)
- Re: MCI [ATM overhead] Wolfgang Henke (Mar 21)
- Re: MCI [ATM overhead] Vadim Antonov (Mar 21)
(Thread continues...)
- Re: MCI [ATM overhead] Gordon Cook (Mar 19)