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<DIV dir=ltr align=left><SPAN class=534121502-04102007><FONT face=Arial
color=#0000ff size=2>Did you configure the span as PRI or RobBit? If your span
is PRI, is your channel 0 the D-Channel? If RobBit, (anyone correct me it I
am wrong) the zaptel driver inserts controlling bits into the data frames. If I
am not mistaken, the 6th and 12th frame. That means, you might have a hard time
send and receiving pure data across those channels.</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
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<FONT face=Tahoma size=2><B>From:</B> asterisk-dev-bounces@lists.digium.com
[mailto:asterisk-dev-bounces@lists.digium.com] <B>On Behalf Of </B>Doug
Ehlers<BR><B>Sent:</B> Wednesday, October 03, 2007 8:26 PM<BR><B>To:</B>
asterisk-dev@lists.digium.com<BR><B>Subject:</B> [asterisk-dev] Zaptel
Programming<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hello
all,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I hope this is the right place to
post this message, I didn’t see just a list for Zaptel
programming.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I am working on a project using a
Digium 405 T1 card. I am trying to write an application to talk via the T1
interface to another piece of equipment.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Very simply, I have set the line
configs in zaptel.conf and then run ztcfg to activate
them.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">In my C++ program, I open the data
channel -> fd=open(“/dev/zap/1”,O_RDWR). This application is very
similar to a PRI line in that one DS0 functions as a control channel with a
pseudo HDLC communications type link and the other 23 channels get dynamically
assigned usage based on incoming and outgoing calls. Each DS0 is setup to
be CLEAR mode, no signaling.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">After opening the device, I check
the buffers and change them to some smaller sizes, make them act immediate,
etc.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I am able to write my message and
see the opposite system get it and acknowledge it with a message back ->
write(fd, buffer, length)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">The problem is in getting the data
back. I have just a simple read loop setup to read the data from the
buffers that I believe were setup after the device was opened. This is
being done with a simple read(fd, buffer, length) kind of command. I
assume with enough buffers, I should be able to read the data rapidly enough to
not lose anything. I always get something back buy 1 in 5 times its
actually correct (when no traffic is present, the opposite side is sending 0xFF
always so its pretty easy to know when there is data coming). Most of the
time the received data bares a resemblance to the message that was sent, but
certainly isn’t it. Occasionally the reply message is exactly correct and
all is well. Its almost like the bit alignment is off or
something.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Is there something I should be doing
differently to reliably read data back from a channel like this? My next
step will be to deal with the audio channels and the mechanism will be
similar. I have looked at a number of example applications such as
fxotune.c and spent some time in chan_zap.c trying to discern the correct way to
read data, but haven’t yet turned anything up. There are quite a few
options to the zaptel API and I haven’t yet located a good document explaining
how to work with it at the level I need.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Can anybody give me some pointers or
point me toward other information and resources?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Many
thanks,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Doug<o:p></o:p></SPAN></FONT></P></DIV></BODY></HTML>