nanog mailing list archives
Re: value of co-location
From: Dorian Kim <dorian () CIC Net>
Date: Fri, 19 Jan 1996 14:58:14 -0500 (EST)
On Fri, 19 Jan 1996, Jim Forster wrote:
Not using either of the last two fast packet services, in particular, will also yield 30% more useful bandwidth from a T3 circuit. This all by itself may make up for the co-location costs and the cost of a router.What's the average packet size now? I think the overhead on DS-3 ATM/SMDS is worse than on OC-3, if I recall correctly, because the DS-3 PLCP is so wasteful as well. Someone should redo these calculations more accurately.
With PLCP, maximum bit rate available for ATM cells = 53 cells * 12 rows * 8bits / 125us = 40.704 mpbs. So, 40.704 * 48/53 = 36.864 mpbs = data rate. Now if you use AAL5, then it's another 2 bytes for SAR, and 2 bytes for CS, so, 40.704 * (48-4)/53 = 33.792 mpbs. Now, that's the theorectical maximum, and you go down from there. -dorian ______________________________________________________________________________ Dorian Kim Email: dorian () cic net 2901 Hubbard Drive Network Engineer Phone: (313)998-6976 Ann Arbor MI 48105 CICNet Network Systems Fax: (313)998-6105 http://www.cic.net/~dorian
Current thread:
- value of co-location George H. Clapp (Jan 19)
- Re: value of co-location Stephen Balbach (Jan 19)
- Re: value of co-location Dennis Ferguson (Jan 19)
- Re: value of co-location Jim Forster (Jan 19)
- Re: value of co-location Dorian Kim (Jan 19)
- Re: value of co-location Jim Forster (Jan 19)
- <Possible follow-ups>
- Re: value of co-location Kent W. England (Jan 19)
- Re: value of co-location Stephen Balbach (Jan 19)
- Re: value of co-location Paul A Vixie (Jan 19)
- Re: value of co-location Russ Pagenkopf (Jan 19)
- Re: value of co-location Stephen Balbach (Jan 19)
- Re: value of co-location Shikhar Bajaj (Jan 19)
- Re: value of co-location Dorian Kim (Jan 19)
- Re: value of co-location postel (Jan 19)
- Re: value of co-location Mike O'Dell (Jan 20)
- Re: value of co-location George H. Clapp (Jan 19)
- Re: value of co-location Andrew Partan (Jan 20)
(Thread continues...)