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- Path: sparky!uunet!spool.mu.edu!agate!doc.ic.ac.uk!uknet!bnr.co.uk!bnrgate!corpgate!brtph560!brtph87!tcain
- From: tcain@brtph87.bnr.ca (Tom Cain WB8OUE)
- Newsgroups: comp.dcom.isdn
- Subject: Re: Newbie Q : 2B+D
- Message-ID: <1993Jan21.201811.10222@brtph560.bnr.ca>
- Date: 21 Jan 93 20:18:11 GMT
- References: <C13MMo.404@fulcrum.co.uk>
- Sender: news@brtph560.bnr.ca (Usenet News)
- Organization: BNR Inc. RTP, NC
- Lines: 21
-
- In article <C13MMo.404@fulcrum.co.uk> graeme@fulcrum.co.uk (Graeme Hodgson) writes:
- >This is probably a FAQ and I'm sorry for asking it (BTW when will the
- >FAQ be posted next?) but I'm not clear on what the 2B+D service is...
- >
- >(1) Configuration? 2 x 64kbit + 1 x 16 kbit = 2B+D?
- That's correct.
- >(2) Can the B channels be used for anything or just speech?
- They carry 64kbps data. The terminal equipment encodes the voice,
- video, data, or other random bits the user may wish to put on it!
- The line must be correctly provisioned by the telco to carry
- the various bearer capabilities. (3.1khz audio (speech), 7khz
- audio, 56kdata, 64kdata, 64k restricted data)
- >(3) Is it the end user who decides whether the D channel carries
- > data or signalling information?
- The D channel always carries signalling for the b channels. Packet
- data can also be muxed onto the d channel, but, it must be
- provisioned as such by the telco.
-
- --
- Tom Cain WB8OUE tcain@bnr.ca
- disclaimer: i don't speak for nobody!
-