Do you think they would cost much to make them? I'd be keen to get them for E1s.
well to make them would certainly cost more than $10 - you can't even buy the box for that price.
You'd be looking at only a crystal or oscillator change to swap from t1 to e1
basically you have a microprocessor that runs the show, 3x t1 line interface chips, that can spit out serial, and pins for alarm conditions, or registers the cpu reads, and the physical interface stuff, and some switching logic that decides when to switch sources.
I am guessing these things probably cost > $1000 new, and I doubt any custom design could approach that in small quantities.
I was actually considering just a relay in the circuit and have some other software detect a dead router/csu/dsu, and then I stumbled onto the deal of the century there. I could not have even bought the relay for that price.
I think they could be sold with an E1PRI card. Especially if VoIP PABX's take off .
Peter
At 20:12 27/10/03 -0500, you wrote: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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