HDLC may be used between routers and routers, routers and mainframes, and
mainframes and mainframes. It's all over the place; that's why it's a
standard. It doesn't have to go over a WAN - it can be back to back - but it
certainly can, though never over POTS. POTS stands for Plain Ol' Telephone
Service, which is limited to 56K (and further limited to 53K in the U.S. by
the FCC), so there's no way that higher bandwidth technologies can be used
over it. Besides that, it's asynchronous, whereas the others you mentioned
are not (well ATM kinda is...).
POTS is a WAN technology, but it's not a protocol like PPP or SLIP. The only
way a WAN protocol (other than async) would use POTS, that I can think of,
is as a backup method.
- Don
-----Original Message-----
From: Oscar Rau [mailto:[EMAIL PROTECTED]]
Sent: Friday, May 19, 2000 7:52 AM
To: Cisco GroupStudy
Subject: WAN question
I have some questions about HDLC and WAN protocols.
Is HDLC via serial interface between router and mainframe? and between
router and router?
If HDLC is done between router to router, is it over WAN using POTS?
Do WAN technologies such as Frame Relay, X.25, HDLC and ATM networks use
POTS?
Thanks you for any info.
--
Oscar Rau
[EMAIL PROTECTED]
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