Subject: ISDN followup (Re: Clock synchronization with ISDN)
To: None <tech-kern@NetBSD.ORG>
From: Christian Kuhtz <email@example.com>
Date: 02/20/1997 21:59:22
Well, found part of my standards documents, and thought I'd follow-up on our
Q.390 is the layer 3 protocol used for ISDN signaling across the
user-interface (SS7 is the inter-switch protocol defined by the Q.700-series).
Basic Call Control defined by Q.391 identifies specific ISDN Information
Elements (IE) for transmission on the D channel in order to support
connections that will be established on the B or H channels. One of them is
the IE defined by 010 1001 (Date/Time). It is 64 bit wide and it appears as
if you can request this IE arbitrarily at any time.
I'm right now digging through the Q.700-series of documents which are
defining SS7, since the Q.390 documents are inconclusive about the timing on
the signaling channel. Perhaps the SS7 definition, which contains elements
similiar to the IE's defined by Q.391 thru Q.393, my give some pointers as to
what exactly the answer regarding the speculation around ISDN signaling
PS: Please include me on the Cc: if you want me to participate in replies,
since I'm currently not subscribed to firstname.lastname@example.org due to the
tremendous workload at my end.
Christian Kuhtz <email@example.com> MIME/NeXTmail Ok
UNIX/Network Specialist "A German in the U.S., speaking for himself *gasp*"
Paranet, Inc., Rocky Mountain Branch http://www.paranet.com/