Is there a better protection than the ROBI’s for the extensions located in out buildings? All the cable is buried and protected.

The IROB (In Range, Out of Building) protector is designed to address the dangers poised by the electrical characteristics of off-premesis extensions. Many Avaya installation guides (particularly the Partner ACS) insist that IROBs be used for Off-Premesis or long haul extensions.

Burial of the cable provides physical protection, but IROBs handle the problems of electrical potential differences and such.

Claims about IROB protection can be found at the US Patent Office at https://www.patentstorm.us/patents/5606489-claims.html.

IROBs are a bit cumbersome to use for those of us who don't connect everything with line cords. I have had no problems using the standard primary protectors at the building entrance and 235 volt secondary protectors next to the system.

-Hal

235v at ksu is fine at KSU co trunks.
I prefer ITW linx.

On station side for opx (not on the same premise or bldg. feed by difference power source (gnd. loop) im not sure what i would clamp the station keysets at.

235v on station side seems a little high, as far
as preference of unit.

I know the partner runs analog as well on its stations side, maybe 90v. would be the max ?

I would put a meter on t/r and see what it kicks at in ringing condition on co ring. Making sure it doesn't clamp to quick.(extension t/r)

I would place the opx protection at both ends of the station in question.

the IROB"S Ive seen are the panamax/itw linx tower max modules

thats all I would use . like Hal said , good primary and secondary protection will do the job

On the station side 90 volt clamping on the T/R can cause a ring trip, too close to the ring voltage. I don't think there is anything (we use 5 pin protectors) between 90 and 235 volts. Like I said, we never had a problem with the 235s.

-Hal