Hans Petter Selasky wrote:
On Saturday 08 March 2008, Robert Watson wrote:
On Sat, 8 Mar 2008, Hans Petter Selasky wrote:
For example, do you
anticipate using or even needing the routing facilities, and how might you
map ISDN telephony parts into the normal network stack infrastructure of
addresses, routing, interfaces, etc?
Hi Robert,
ISDN is very simple. In the ISDN world there is a term called TEI which is the
Terminal Entity Identifier. This kind of like an IP address.
Besides from the signalling there are 2 B-channels which can transport data or
audio. One of my goals is to achive zero copy when moving data to/from an
ISDN line and also in combination to Voice over IP. Currently data is moved
through userland (Asterisk typically) which is usable in the short term, but
in the long run I want this extra copying removed. The idea is that I can
route [IP] packets (mbufs) through various filters in the kernel without the
need for copy.
Given the speed of ISDN connections, It is not worth doing zero copy
on ISDN unless you have more than 1000 of them, which seems unlikely.
given a total throughput of 128000 b/s and the speed of current
hardware, the number of packets per second is probably not high
enough to make the difference even noticable.
--HPS
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