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Cell Relay Retreat>List Archive>month:1995-Apr> msg00426



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Re: TCP window size

  • From: jrc@Eng.Sun.COM (Jerry Chen)
  • Date: Wed, 26 Apr 1995 15:02:42 -0500, 26 Apr 1995 19:50:50 GMT

Craig Partridge mentioned:

> So, for instance, OC-3c (about 139 Mb/s after SONET and ATM overhead) 
> across a continent (say 60 ms of transit time) has a delay*bandwidth 
> product of 139 * 0.060 = 8.3 Megabits or a little over 1 MB.  So if 
> the window size is less than 1 MB, a single TCP won't fill the link.

For OC-3c, the available bandwidth should be 149.760 Mbps for ATM and
135.632 Mbps for AAL, according to John David Cavanaugh's paper
"Protocol Overhead in IP/ATM Networks", Minnestota Supercomputer
Center, Inc.

Martin De Prycker, in his famous ATM book, also mentions the bit rate
available for (SONET) user info is 149.760 Mbps (page 117).  An ATM cell
has 5 bytes header.  So, if you multiply 149.760 by 48/53, you will
also get 135.63.

Jerry