[Asterisk-Users] Port density: DS3 cards?
jtodd at loligo.com
Thu Dec 4 13:06:36 MST 2003
Obviously, there are no DS3 TDM cards that are currently compatible
with Zap channels. (or are there?)
Does anyone know of an inexpensive DS3 card that could perhaps be
used with Asterisk if one were to try to port the Zap drivers to such
a card? PCI, of course, would be the bus of choice.
I think there are quite a few discouraging comments to be made on
that question. Firstly, most companies that produce telecom hardware
have silly overhead, and thus the price of their cards is
astronomical. Secondly, most companies that produce telecom hardware
are of the opinion that transcoding (compression) should be done via
DSP's, which inflates the cost of the card significantly. Thirdly,
most telecom hardware vendors would not consider allowing their
drivers into the public domain if such development were to happen.
I've talked to some parties (you know who you are) who have expressed
some interest in building this type of interface, but a situation
where I can actually put my hands on equipment is far better than
speculative interest by those who have not even decided to go forward
with design, no matter how interesting the end product sounds on the
However, regardless of all these negatives, I'm interested in any
vendors anyone can offer as a starting point.
Please, don't pester me with comments like "Why do you need 28
PRI's?" or "You'll never use that much capacity." Assume that I
actually DO have that volume of traffic, and assume there are several
dozen other people on this list (lurkers and active people) who have
the same requirements, and assume there are hundreds more people out
there who have the requirement but haven't considered Asterisk
because DS3 isn't an option.
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