[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[ih] The origin of variable length packets

At 0:06 -0500 2011/03/01, Vint Cerf wrote:
>correct, dave
>On Mon, Feb 28, 2011 at 11:47 PM, Dave Walden 
><<mailto:dave.walden.family at gmail.com>dave.walden.family at gmail.com> 
>At 07:50 PM 2/28/2011, Noel Chiappa wrote:
>I would assume/guess that the first well-known and wide-scale use was in the
>  Frank Heart, Robert Kahn, Severo Ornstein, William Crowther, David Walden,
>  The Interface Message Processor for the ARPA Computer Network (1970 Spring
>  Joint Computer Conference, AFIPS Proc. Vol. 36, pp. 551.567, 1970)
>I'm not close to home right now, so I can't look up what ARPA's call 
>for bids (RFQ) to develop the ARPANET IMP's specified.  I sort of 
>feel that it already specified that the host computers could send 
>messages that were variable length up to about 8,000 bits, and the 
>packet-subnet of IMPs broke these messages into about 1,000 bit 
>packets with the last packet in a message being possibly being 
>shorter than a full 1,000 bits.  Anyway, that's the way, as I 
>remember, that we initially implemented it in the IMPs.  I do 
>remember that there was a preconception of bi-modal message traffic 
>with file transfers being broken into 8,000 bit messages, and 
>interactive terminal traffic being messages of only 10s or 100s of 
>bits, i.e., one packet or less.  I also think I remember that the (I 
>think 24-bit) CRC on inter-IMP packets was calculated to have the 
>desired error detection rate based on 1,000 bit packets.
>home address: 12 Linden Rd., E. Sandwich, MA 02537; home ph=<>508-888-7655;
>Portland ph = <>971-279-2173; cell ph = <>503-757-3137; Sara cell ph 
>= <>508-280-0446
>email address: 
> <mailto:dave at walden-family.com>dave at walden-family.com; website(s): 
> <http://www.walden-family.com/>http://www.walden-family.com/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://elists.isoc.org/pipermail/internet-history/attachments/20110301/fa340222/attachment.html>