No it IS used to transport data in some environments (not cisco)
In the UK / Europe is used by some credit card machines for X.25
back to the banks. Charging is on a per packet basis rather than
duration as on the B channels, this makes B channel prohibitively
expensive for credit card authorisation - lots and lots of 3 second calls.
Simon
-----Original Message-----
From: Cthulu [mailto:[EMAIL PROTECTED]]
Sent: 23 January 2001 13:44
To: [EMAIL PROTECTED]
Subject: ISDN D channel packet switchin
Hi, all
I am reading the 2nd edition of Caslow's book, and am on the ISDN chapter.
In one sentence, he states that the D channel may be used for packet
switching.
I have read other texts that have said the same thing, but I have yet to
find one that expounds on it. This seems quite contrary to the countless
instructors, books, etc. that have stated that the D channel is NOT for data
transport, and that the B channels (and H channels under PRI) are the only
ones used to move data. By data, I mean data, voice, video.
So, here's my guess:
When these texts say that the D channel may be used for packet switching, I
envision a X.25 type setup where the switches all switch "stuff" between
themselves? No? Who's laughing?
How about this:
Special applications (devices) may use the D channel to transport data when
it's not being used for D channel stuff like talkin' to the switch? No?
How about this:
Caslow, et al are making fun of me again. No?
TIA,
Charles
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