Problem losing ASM's (no dial tone)

[djs01]

We have a customer that keeps on losing his ASM's. They go dead, the power light is on, but no dial tone on any of the ports. As far as I know the ports are connected to outside cable run overhead on poles to another building. Is it possible that we are getting some foreign voltage on the cable pairs that is feeding back into the asm? The main ksu and all modules are on an on-line UPS. The customer has replaced 2 ASM's in the last 4 months.
Any ideas?
Dave

 

[senk1s]

overhead wiring ...install protection at both entry/exit points. Do u have any protection in place.

sending the bad modules to repair can be used to diagnose what caused hte module to die

 

[rconn]

The documentation does say that the ASM's are not to be used for off premise applications. However why it is a problem I do not know. ATA2's seem to work well for me in off prem applications. Protection at both ends of the tie cables is a good idea for any application.

Rob

 

[telemarv]

Do the ASM's come back to life or do you need to replace the unit? Do all 8 ports go down or just one at a time?

ASM's are not authorized as OPX because of government regulation. They don't contain the proper protection circuitry to go out over the public infrastructure.

I assume your overhead cable is privately owned. Definitely need to be lightning protected.

As senk1s said send one for repair with a request for feedback of what the trouble is.

 

[djs01]

Had my tech go check it out. Power light on, no battery or dialtone on all 8 ports. There is a 2nd ASM piggybacked to the first one and it works fine.
Checked for foreign voltage on all 8 ports, nothing coming in from the outside cable.
We found out that there is one circuit which goes to a telephone at a weigh scale 1.5 km away (1 mile). We are going to go back with our cablemeter to test the cables and see what the loop length comes back with.

What is the loop length limit for ASM ports?

I'm suspecting that the distance is too great, which is putting a strain on the ASM power supply, which in turns overheats and burns out.

Thoughts?