Ben Greear <[email protected]> writes:
> I think if I could support these scenarios below, I would have
> everything I need:
>
> * Configure T1 as unchannelized bitstream, bridge entire thing to
> second T1.
I think it should be easy with such card, though I think the drivers
can't currently do that.
> * Configure channels 1-5 as a bitstream and bridge that to channels
> 1-5
> of a second T1. (random proprietary bit-streaming protocol,
I think the hardware would permit that. Probably needs additional
driver support and I'm not sure about timeslot synchronization (for
HDLC, sync doesn't matter).
> would probably bridge HDLC just fine, but handling
> HDLC as frames would be more efficient I think.)
Not sure, maybe yes (less data to bridge due to bit stuffing, flags etc.),
maybe not (variable length of HDLC frame).
> channels 6-10 configured as an HDLC interface, bridged as HDLC
> frames to channels 6-10 of a second T1. (PPP & other protocols over
> HDLC)
> channels 10-24 each configured as a separate bit-stream, bridged to
> channels 10-24 on the second T1. (Voice)
I think the above could be a problem - I think common T1/E1 cards
can do only one stream at once.
I wonder if it can be done in software - the hardware framer would
have to pass all data transparently, and it would be demultiplexed,
processed and then multiplexed by the driver. Quite complicated,
but I think at 2 Mbps it wouldn't be a CPU performance problem.
> * Configure entire T1 as HDLC transport, bridge HDLC frames from one
> T1 to the other.
Easy even with existing drivers I think (no bridge support but it's
trivial).
--
Krzysztof Halasa
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