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[ih] Packet nets not connected to the ARPAnet

On 7/23/2012 4:18 PM, Alex McKenzie wrote:
>CSNET (funded by the NSF) used both ARPAnet and
> Telenet for transport but only provided user-level (eg mail)
> interconnection and only for CSNET members.

Initially, CSNet was strictly email transfer, but it evolved to generic 
packet services.

The initial interconnection was between dial-up access to a CSNet relay 
and the Arpanet.  First use of Telenet was actually dial-up across X.29 
(telnet equivalent).  CSNet saw Telenet as a dial-up link.

Its "phonenet" service layer put a packet discipline over the dial-up, 
which meant that I needed to tailor its packet size to match the one 
used by Telenet, or traffic charges doubled.  Eventually CSNet did 
provide IP over X.25.

Until using IP, strictly speaking CSNet was connecting hosts to the 
Arpanet, rather than doing what we call internetworking.


  Dave Crocker
  Brandenburg InternetWorking