[ih] Cisco origins (Was: when did APRANET -TIPs become known as -TACs)

[Jack Haverty]

Perhaps a cisco terminal concentrator was descended from the TIU 
(Terminal Interface Unit) which I recall was created by Stanford/SRI?

The TIU was in common use in ARPA projects in the early 1980s, along 
with the SRI PE (Port Expander) which allowed a site to put additional 
TCP-only computers on the ARPANET but use only a single IMP port.  I've 
always wondered if any of SRI's work somehow migrated into commercial 
products.

Lots of TIU artifacts are online (at your MIT site!), including the code.

/Jack

On 9/29/25 02:15, Noel Chiappa via Internet-history wrote:
> My memory is that they did, roughly simultaneously, a multi-protocol router
> _and_ a terminal concentrator - in fact, they were more focused on the
> terminal concentrator at the very start. The router was based on prior work
> at Stanford - Bill Yeager's work. I don't know about the Cisco terminal
> concentrator - although I retain a vague memory that it had its roots in
> prior Stanford work too. (I did a Web search for "Cisco terminal
> concentrator origins", but nothing turned up.)
>

-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_signature.asc
Type: application/pgp-signature
Size: 665 bytes
Desc: OpenPGP digital signature
URL: <http://elists.isoc.org/pipermail/internet-history/attachments/20250929/07f86600/attachment.asc>