[VoIP] More pulse dialing mysteries

[ikjtel]

Russ

This is interesting...  I am not surprised that
changing the T1 clocking source had no effect. 
Changing the m/b ratio probably just signifies that
things were already kind of marginal to begin with...

You might try enabling the 'printk' which I've pasted
below.  It might also be helpful to add a printout of
the "jiffies" value so as to get an idea of the
passage of time and specifically the points in time
when the rbs bits are being changed...

My expectation however would be that you'll see *both*
sets of timings (i.e., the working case and the
problem case) be correct at this point within the
code...  Offhand and without anything to back it, I
suspect the problem may be further down in the wct1xxp
drivers...

Unfortunately I don't have a channel bank FXO here.  I
was trying to figure if it could be simulated using a
channel bank FXS...

Max

[existing code from zaptel.c]
#ifdef CONFIG_ZAPATA_DEBUG
                                printk("Setting bits
to %d for channel %s state %d in %d signalling\n",
outs[x][txsig + 1], chan->name, txsig, chan->sig);
#endif  

--- Russ Price <kxt at fubegra.net> wrote:

> Delving into the code, I noticed that zaptel.h
> naively uses a 50:50 
> pulse make/break ratio (ZT_DEFAULT_PULSEBREAKTIME
> and 
> ZT_DEFAULT_PULSEBREAKTIME are both set to 50 ms).
> 
> I tried using the US-standard 61:39 and UK-standard
> 67:33 ratios, and I 
> found that pulsing was still accurate with the
> TDM400P card - but the 
> Adtran FXO card got even worse.
> 
> Another thing I tried, which made no difference
> either way, was to 
> configure the channel bank to generate the timing
> and tell the TE110P to 
> use the channel bank as the timing source.
> 
> I'm not really a T1 guru, but I'm wondering if the
> way that T1 sends 
> supervisory signals messes with the timing of the
> pulses?  I kind of 
> doubt it, though, since FXS pulse dialing works just
> fine on the channel 
> bank.
> 
> 	Russ
> 	CNET: 1-442-7877
> 	FWD: 699408
> _______________________________________________
> VoIP mailing list
> VoIP at ckts.info
> http://lists.ckts.info/mailman/listinfo/voip
> Project Web Page: http://www.ckts.info/
> 



 
____________________________________________________________________________________
Don't get soaked.  Take a quick peek at the forecast
with the Yahoo! Search weather shortcut.
http://tools.search.yahoo.com/shortcuts/#loc_weather