[Gllug] 64K Channels and all that ...

[t.clarke]

Just out of interest, we have a connection through a Cisco ISDN router I think,
to the UK Customs facility (PACE) which uses the D channel in the manner
described.  If I recall correctly, when the other end wants us to collect data
they send some kind of control packet over the permanently on D channel which
causes the router to 'dial out' over one of the 64K channels and initiate a
connection to the host computer.

Out of total curiosity, does anynone know how ISDN data (being synchronous ?)
is 'framed' so that each byte is recognised ??


Tim

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