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- Newsgroups: comp.dcom.isdn
- Path: sparky!uunet!usc!zaphod.mps.ohio-state.edu!darwin.sura.net!sgiblab!sgigate!sgi!rigden.wpd.sgi.com!rpw3
- From: rpw3@rigden.wpd.sgi.com (Rob Warnock)
- Subject: Re: X.25 ofer the D channel
- Message-ID: <skm7544@sgi.sgi.com>
- Sender: rpw3@rigden.wpd.sgi.com
- Organization: Silicon Graphics, Inc. Mountain View, CA
- Date: Sat, 21 Nov 1992 07:54:50 GMT
- Lines: 35
-
- dunham@bonehead.esd.sgi.com (William Dunham) writes:
- +---------------
- | I understand that it is possible to run X.25 of the D channel of ISDN?
- | Anyone have any idea how popular this is? What are the applications for this?
- +---------------
-
- Obviously, it's not wide-spread yet (at least not in the USA), but there
- have been several "well-suited" applications suggested:
-
- 1. Credit-card verification traffic. Instead of picking up a phone and
- dialing the credit-card verification center (as it does now), the
- little terminal would just send a D-channel packet.
-
- 2. All sorts of other POS traffic (e.g., debit cards).
-
- 3. Burglar alarms and other security functions. These would send "poll"
- messages to say that things were o.k., or not. (Silence would be taken
- as an indication that the line had been cut or the system tampered with.)
-
- ...and so on. Wherever the "call" is infrequent, the data small, yet the
- needed round-trip time fairly low (lower than a call-setup time).
-
- Note that for large amount of data, D-channel packet is going to be priced
- *much* higher per bit than B-channel circuit data. But for the one-packet-
- a-minute stuff...
-
-
- -Rob
-
- -----
- Rob Warnock, MS-9U/510 rpw3@sgi.com
- Silicon Graphics, Inc. (415)390-1673
- 2011 N. Shoreline Blvd.
- Mountain View, CA 94043
-
-