Re: [Technical Errata Reported] RFC3331 (1425)
"Brian F. G. Bidulock" <[email protected]>
| Newsgroups | gmane.ietf.sigtran |
|---|---|
| Organization | http://www.openss7.org/ |
| Message-ID | <[email protected]> |
David, David Laight wrote: (Mon, 19 May 2008 10:21:56) > > I'm getting confused about this discussion about the SDT and SDL > identifiers (not helped by something discarding half of the emails). > > Why should M2UA know anything about ISUP CIC values when attempting > to allocate a singalling link? > In many cases the timeslot on a TDM link used for signalling > isn't allocated a CIC number. See Q.704/1996 Clause 15.13.4. > I would have thought that any values used here have local > significance to the M2UA server (ie the TDM side) and be > used to determine which TDM timeslot to use. > So the SDTI would select between the physical hardware > units that run MTP2, and the SDLI would select a port. > This would mean that both values might be 32 bit numbers. SDLI is per MTP specifications and is externally significant, SDTI is only of significance to the ASP and the SG. > 16 bit CICs could easily be in use in international links. The field in Q.704/1996 Figure 22 is 12 bits. --brian -- Brian F. G. Bidulock [email protected] http://www.openss7.org/