asterisk users - Jun 2005 - T1 multiplexer (or ?) for failover in large installation

Hi,

Please forgive my terminology, still a bit new to T1s and such.

I'm looking for a way to have 5 T1s from a carrier terminate into some type
of box (multiplexer?), then be able to plug 7 asterisk servers into that box
(each with single port T1 card) and be able to have 2 * servers go down at 
any given time and not actually have the carrier see that anything has happened.
Obviously if a * server crashes the calls on it at the time will drop, but 
then once the box (multiplexer?) sees that a T1 is down (between the box 
and asterisk) it will terminate those DS0's on another T1. Basically some 
type of hunting/pooling/load balancing.

Anyone heard of anything like this? Or am I off my rocker?

Thanks,
Mike

It sounds like your looking for a t1 protection switch with will do what you 
want It can switch t1's for failover or  loss of signal on a t1. These are 
usualy rather expensive and Might work 100% in your example because they 
will only switch over if th actuall t1 goes down. So If your server 
dies/locks up and doesnt tell the t1 to go into alarm it will still think it 
is up and not switch to the other.


----- Original Message ----- 
From: "Mike" <mike-asterisk@potatoslicer.com>
To: <asterisk-users@lists.digium.com>
Sent: Monday, June 13, 2005 10:35 AM
Subject: [Asterisk-Users] T1 multiplexer (or ?) for failover in 
largeinstallation

> Hi,
>
> Please forgive my terminology, still a bit new to T1s and such.
>
> I'm looking for a way to have 5 T1s from a carrier terminate into some 
> type
> of box (multiplexer?), then be able to plug 7 asterisk servers into that 
> box
> (each with single port T1 card) and be able to have 2 * servers go down at
> any given time and not actually have the carrier see that anything has 
> happened.
> Obviously if a * server crashes the calls on it at the time will drop, but
> then once the box (multiplexer?) sees that a T1 is down (between the box
> and asterisk) it will terminate those DS0's on another T1. Basically
some
> type of hunting/pooling/load balancing.
>
> Anyone heard of anything like this? Or am I off my rocker?
>
> Thanks,
> Mike
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
> To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-users
>

The box that you are talking about sounds a lot like a DACS.  You might
google around on that term to see if any might have automatic failover.  A
DACS can be reconfigured to cross-connect various DS0s on the fly -
although, no matter how fast the switchover, the carrier will always
"see"
that something happened.  Depending upon what type of signalling you are
using, the trunks could end up out of service for a period longer than it
takes to switch to the backup server.  Also, the system can potentially
fail in several ways.  At the T1 level, at the trunk level and at the
application level.  Depending upon the nature of the failure, the one-box
does it all solution seems unlikely to work - at least not by itself.

-----Original Message-----
From: Mike
Sent: Mon, June 13, 2005 11:35 am

Hi,

Please forgive my terminology, still a bit new to T1s and such.

I'm looking for a way to have 5 T1s from a carrier terminate into
some
> type
of box (multiplexer?), then be able to plug 7 asterisk servers into
that
> box
(each with single port T1 card) and be able to have 2 * servers go down at
any given time and not actually have the carrier see that anything
has
> happened.
Obviously if a * server crashes the calls on it at the time will drop, but
then once the box (multiplexer?) sees that a T1 is down (between the box
and asterisk) it will terminate those DS0's on another T1. Basically some
type of hunting/pooling/load balancing.

Anyone heard of anything like this? Or am I off my rocker?

Thanks,
Mike
_______________________________________________
Asterisk-Users mailing list
Asterisk-Users@lists.digium.com
http://lists.digium.com/mailman/listinfo/asterisk-users
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users