On Nov 9, 2006, at 11:37 AM, Florian Overkamp wrote: > - Do we consider hardware HDLC an absolute requirement ? No, not at all. HDLC blips are certainly nothing to be terribly concerned about. In MTP2, there is a measurement done on the rate of them coming in the form of a "leaky bucket" error rate monitor. A certain error rate threshold has to be exceeded before it reports a problem to MTP3. I don't think we have any problems even with software HDLC with exceeding this threshold. Also, MTP2 is designed to be able to retransmit any MSUs that have been received in error. Certainly no more than chan_ss7 might experience in comparison. > - How about echocancellation ? Echo cancellation is always a useful thing. It really depends on your setup, but if you're doing SS7, you probably want some decent echo cancellation "Just in case". > - What kind of PRI boards are you guys using, Digium / Sango ?? I've done all my testing and development for libss7 on Digium boards. Obviously I'm a bit biased since I work for Digium, but I think that since I'm very familiar with how they work, I can make it run better through additional driver work and so forth. Matthew Fredrickson
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