I have a problem in an Alcatel BTS A9100 (indoor GSM 4+4+4), the problem is located in sector 3 with 4 TRX (X polarisation antenna:+45,-45),always there is one TRX down with this message(alarm 10 class 10 in BTS Terminal):
TRE-VSWR:a fault has been detected by the VSWR supervision on the TRE output during initialization or operation states…
the TRX is changed, the combiner is changed,the cable between TRX and combiner is also changed (VSWR of sector:1.1 1.1), this problem affect one,two or three TRX in the same time, now three TRX work and one is locked.
normally, this is an ANC failure… have you tried swapping TRX with another one ? The faulty TRX is the same, or is it the new TRX becoming faulty ?
I would exchange the ANC by another one again, from sector 1 or sector 2, since they are working.
You could also try changing the SUM card… and eventually, change the whole BTS 🙂
in fact we are also facing the same problem, TRE5 of SectorGSM C,after lock/unlock TRE got busy but after some time it went down again
what we have done so far is:
-changed the TRE
-changed the CSO3 cable
-changed the port of the ANC
-changed the slot of TRE
-done the offline comissioning of SUMA
what next? please suggest if im missing some thing….