From: B Kim (beokim@comcast.net)
Date: Mon May 23 2005 - 23:00:25 GMT-3
Hi
I am not sure that I can explain this well, but I will try.
These two timers can be best explained in the PPP callback scenario.
Callback Client Callback Server
T = 0 ---------- Call --------->
Wait-for-carrier-timer starts
<-------- Disconnect ----- Enable-timer starts T = t1
<------- Callback -------- Enable-timer ends T = t2
Wait-for-carrier-timer ends
T = t3
The callback server calls back when the enable-timer expires.
The callback client expects to receive the call before the
wait-for-carrier-timer expires. So the wait-for-carrier-timer must be
longer than the enable-timer. Probably two times longer is safe.
The carrier signal is analog nature by itself, but digitized format on
the ISDN line.
I am not an ISDN expert myself, so not that sure.
Hope someone clarify this.
Beomsu Kim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
pierre.guanel@tiscali.fr
Sent: Sunday, May 22, 2005 1:28 PM
To: ccielab
Subject: Carrier Signal and ISDN and Wait-for-carrier-time in PPP
callback
I am trying to understand why Cisco recommends to set the dialer
wait-for-carrier-time (on the ppp callback client) at twice the value
of the enable-timeout (ppp callback server) .
First ISDN modems are digital so waiting for an analog carrier signal is
never going to happen !!!
Second, supposing that a signal of some sort (?) was received, how
setting the enable-timeout to half the value (on the ppp callback
server) would be beneficial?
Thanks
Pierre-Alex
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