Messages in this thread | | | Subject | Re: Question on HDLC and raw access to T1/E1 serial streams. | From | Krzysztof Halasa <> | Date | Sun, 01 Oct 2006 13:54:15 +0200 |
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Ben Greear <greearb@candelatech.com> 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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