Peter,
I asked this question in other list (asterisk-br). Both answers make it is clear now.
If I got the matter, unstructured framing is used for Data (2M full) and structured for "64k circuits".
Thank you.
Alex Robertson
Peter Svensson wrote:
On Tue, 11 Jan 2005, Alex G Robertson wrote:
http://ckp.made-it.com/g704.html says:
"G.704 is the framing specification for G.703. A carrier can 'steal' a 64kbps time slot (TS0) from a 2.048 Mbps line and use this to provide timing. The result is that 31 time slots are left for data, which equals in a bandwidth of 1.984 Mbps.
Normally G.703 lines with G.704 framing is called Structured G.703. Carriers offer G.704 when their network is built up on a cross-connect basis, and will offer unstructured G.703 when their infrastructure is based upon multiplexers."
But, what about Asterisk and Digium TDM interface TE405/TE410 ? Does it support Structured and Unstructured framing?
If you ask your telco to set up an ISDN PRI they should have most of the information they need.
A PRI is carried over a structured T1/E1. I don't think the Digium cards can be operated as a raw (unstructured, non-channelized) T1/E1.
Peter
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-- Alex G Robertson NOC - Microlink
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