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

Jon Pounder JonP at inline.net
Mon Oct 27 19:06:18 MST 2003


At 08:46 PM 10/27/2003, you wrote:
>Jon -
>   Can you please post the name of the product and model number?  Some 
> cursory searches don't find appropriate results on eBay or Google.

verilink-1558a_cg

The manufacturer was very helpful and sent me the software for it for free 
as well.
I bought from evaluecomp on ebay. (Larry something or other, and he had 
lots of them)


>JT
>
>
>
>>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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