asterisk users - Jan 2004 - How to Order Disconnect Supervision from SBC using Adit 600?

Can anyone help me with the term that SBC uses to refer to disconnect
supervision?  I have an Adit 600 channel bank which has helped improve the
disconnect detection time down to about 8 seconds. This is still causing some
issues in particular with call progress enabled in * we are having a few
disconnects while calls are in session (about 2 reported in first 5 days of
use).

I have talked both to a local phone contractor and SBC directly and no one
seems to know what I am talking about. The phone contractor knew about the issue
with other phone systems in the area but didn't know there was a way to fix
it
and SBC reps seem to never have heard of disconnect sup or calling party
disconnect.

The * Handbook refers to loop start with call sup as kewlstart are
there other names for this protocol? One of the local contractors thought that
SBC automatically drops line voltage on remote hangup, in which case I need to
know what signalling to program into the ADIT 600's fxo channels. I also
have
the option of going to groundstart signalling if this would fix the problem, but
it would cause some line downtime so it is not my preferred method.

The Adit 600 manual lists the following options for mapping FXO ports to the T1
DSO.

DPT = Dial Pulse Termination
EMDW = E&M Delayed Wink start
EMI = E&M Immediate start
EMICPD = E&M Immediate Start with Calling Party Disconnect
EMW = E&M Wink start
GS = Ground Start
GSRB = Ground Start with Reverse Battery
LS = Loop Start
LSCPD = Loop Start Calling Party Disconnect
LSRB = Loop Start with Reverse Battery
VoIP = Voice over IP (CMG only)

I believe I currently have the lines set to LSCPD which improved the hangup
situation, but hasn't completely fixed it.

I don't know if this has any relevance but I am also originating the clock
source from the * side with Wildcard T1 card.
-- 
Jonathan Moore
Director of Technology
Winfield Public Schools
Office 620.221.5100
Fax 620.221.0508





Visit Winfield Public Schools at http://usd465.com
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On Tue, 13 Jan 2004, Jonathan Moore wrote:
> LSRB = Loop Start with Reverse Battery
> I believe I currently have the lines set to LSCPD which improved the hangup
> situation, but hasn't completely fixed it.
Try LSRB - it may work.

-- 
Joel

> Can anyone help me with the term that SBC uses to refer to disconnect
> supervision?  I have an Adit 600 channel bank which has helped improve the
> disconnect detection time down to about 8 seconds. This is still causing
> some
> issues in particular with call progress enabled in * we are having a few
> disconnects while calls are in session (about 2 reported in first 5 days
> of use).
>
> I have talked both to a local phone contractor and SBC directly and no one
> seems to know what I am talking about. The phone contractor knew about the
> issue
> with other phone systems in the area but didn't know there was a way to
> fix it
> and SBC reps seem to never have heard of disconnect sup or calling party
> disconnect.
I've never seen a line from SBC that DIDN'T come with disconnect
supervision (some SBC line monkeys I know call it "battery drop
disconnect").

> The * Handbook refers to loop start with call sup as kewlstart are
> there other names for this protocol? One of the local contractors thought
> that
> SBC automatically drops line voltage on remote hangup, in which case I
> need to
> know what signalling to program into the ADIT 600's fxo channels. I
also
> have
> the option of going to groundstart signalling if this would fix the
> problem, but
> it would cause some line downtime so it is not my preferred method.
Kewlstart is also an alias for battery drop disconnect.
> The Adit 600 manual lists the following options for mapping FXO ports to
> the T1 DSO.
>
> DPT = Dial Pulse Termination
> EMDW = E&M Delayed Wink start
> EMI = E&M Immediate start
> EMICPD = E&M Immediate Start with Calling Party Disconnect
> EMW = E&M Wink start
> GS = Ground Start
> GSRB = Ground Start with Reverse Battery
> LS = Loop Start
> LSCPD = Loop Start Calling Party Disconnect
> LSRB = Loop Start with Reverse Battery
> VoIP = Voice over IP (CMG only)
>
> I believe I currently have the lines set to LSCPD which improved the
> hangup
> situation, but hasn't completely fixed it.
That should be right.  If you're really interested in looking, take a
cheap voltmeter and put it across the line.  If everyone is on hook,
you'll see 48V.  If someone goes off hook, you'll see it drop to about
6V.
 If you see a quick drop to 0V when the far end hangs up, you've got
battery drop disconnect.
> I don't know if this has any relevance but I am also originating the
clock
> source from the * side with Wildcard T1 card.
That's really the only way it'll work.  The channel bank can't
generate
clocking.

On Wednesday, January 14, 2004 11:45 AM, TC [SMTP:trclark@shaw.ca] 
wrote:
>
> > > I don't know if this has any relevance but I am also
originating
> > > the clock
> > > source from the * side with Wildcard T1 card.
> >
> > That's really the only way it'll work.  The channel bank
can't
> > generate
> > clocking.
> Is that a general statement of just confined to the ADIT 600
> I thought any T1 interface could either receive timing or it can be a
> source for timing
> its just the interface may not be a high quality source eg stratum 4
> not stratum1
>
Any clock can be the source. Of course, you should select the highest 
available stratum clock and time everything else from this if possible. 

Another problem is if equipment at both ends of a T1 are trying to 
derive timing from the other end. This can cause an unstable clock and 
create synchronization problems.

Always, always for T1s, one end needs to provide timing and the other 
end derive timing. (The only exception is if the equipment on both ends 
are tied to stratum 1 clocks. However, I would guess that this does not 
apply to any of us on this list).

Don Pobanz