[Asterisk-Users] Can X100P/X101P detect reversal of line polarity?

[Steven Critchfield]

On Thu, 2004-07-08 at 04:28, Mikael Magnusson wrote:
> On Thu, Jul 08, 2004 at 08:30:59PM +1200, Richard Scobie wrote:
> > 
> > One thing to watch for here is RX gain if busydetect does not seem to be 
> > working after trying all the combinations.
> > 
> > I had a 2 x X101P setup which busydetected perfectly - TX and RX gains 
> > were at the default levels.
> > 
> > The X101Ps were replaced by a TDM card with 4 x FXO modules and with no 
> > config changes, busydetect stopped working. After incrementing in 1dB 
> > steps, an RX gain of 3.0 brought back reliable busydetect.
> > 
> > I look forward to Rich Adamsons forthcoming writeup on setting up the 
> > gain distribution in an Asterisk system, to get everything working 
> > optimally.
> > 
> 
> In Sweden we don't get a busy signal when the remote part hangs up.
> Instead remote hang up is signaled by reversing the polarity of the line.
> Can X100P/X101P detect polarity reversal when off hook, on hook, or both? 

I believe the chip is capable of that detection. It may need a driver
tweak to get it there and into a meaningful message in zap. 
-- 
Steven Critchfield <critch at basesys.com>