[ih] The origin of variable length packets

[Vint Cerf]

correct, dave


On Mon, Feb 28, 2011 at 11:47 PM, Dave Walden
<dave.walden.family at gmail.com>wrote:

> 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
>> ARPANet.For the ARPANET:
>>
>>  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)
>>
>
>  Hi,
>>
>
> 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.
>
> Dave
>
>
>
> --
> home address: 12 Linden Rd., E. Sandwich, MA 02537; home ph=<508-888-7655>
> 508-888-7655;
> Portland ph = <971-279-2173>971-279-2173; cell ph = <503-757-3137>
> 503-757-3137; Sara cell ph = <508-280-0446>508-280-0446
> email address:  dave at walden-family.com; website(s):
> http://www.walden-family.com/
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://elists.isoc.org/pipermail/internet-history/attachments/20110301/777eff55/attachment.htm>