[Asterisk-Users] PRI & Asterisk Redundancy/Fail-Over

[Jon Pounder]

look for a T1 failover switch.

(cheap as dirt on ebay, mine was $7.50, - yes really, I got the decimal in 
the right spot, hard to find an empty rackmount box that is cheaper.)

Basically it looks like a Y in the T1. It contains a csu/dsu on each 
interface. It decodes the t1 signals, and then re-encodes them using its 
reframer. It looks at the signal enough to know if one of the branches of 
the Y is in alarm, lost completely, etc. You can specify the criteria when 
to switch and when to switch back on restoration of original circuit.

These things are actually designed to take dual t1's coming in and select 
the right one to feed to CPE, but like you I use mine the opposite way 
around to connect a working set of CPE to the inbound T1.

I use for a data t1, but voice/pri is all the same as far as this thing is 
concerned, it only looks at the clocking, and alarm, etc., not the actual 
data contained in the serial stream.



At 08:02 PM 10/27/2003, you wrote:
>Hi,
>
>I'm trying to put together an * system with extremely high up time.
>
>The system as it stands now is 1 dual p4 with raid, redundant power, etc..
>and a T100P card. I would like to get a second similar or identical box
>with another T100P card. I have 1 PRI, how do I get the second box to take
>over communication with the PRI should the first box fail? Of course I'd
>like this to be done without manually unplugging the PRI from box 1 and
>plugging it into box 2.
>
>Thanks,
>Justin
>
>
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