The links work fine most of the time. But, occasionally all the E1
> links on the Cisco SS7 equipment go down. We haven't yet found what
> causes the problem. Usually the only way for the links to come up is
> to reboot the equipment or sometimes to shutdown and startup the E1 > controllers.
> We have some connections going straight to another SS7 equipment
> through a couple of baluns. We suspect these connections might be
> causing some problem because we haven't got the grouding configuration
> correct for the balun's involved in these connections. Ever since we
> have disconnected these connections the problem seems to have
> vanished.
> Can someone suggest anything or has someone seen any problem like this > before?
This sounds like a typical ground loop problem to me. Get out the scope and start looking for 60 Hz trash on the balanced lines. I bet you see some problems.
Everything should have one and only one path to the central ground. Never none and never two.
--scott
"C'est un Nagra. C'est suisse, et tres, tres precis."