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hey guys…..what is the difference between the lapd alarm in huawei and lapd oml fault and how to deal with it
must be a loose E1 connection, i guess?
LAPD-OML meant site not managed from NMC side and service affected, for example ” link between two sites down, site down power , loss in all E1s ..etc)
LAPD mean cell out of service ” service effected ” but site managed and monitored from NMC . for example ” some of E!s down,service boards shut down…etc”
thanks mohamed for answering,it was helpful but how can we deal wiyh these alarms..lets say E1 down?
Mr. Shadow,
in V3 GSM equipments the LAPD is working dynamic, when we have LAPD alarm it mean only one prat is affecting and when LAPD & OML is down it mean totally BTS is out of service.
there Can be happen to oml down will receiving is low .
thanks all
Hi Shadow
OML Fault is generated when the OML is disconnected b/w BTS and BSC.Its a critical Alarm in Huawei.Although BTS reset automatically after 15 min if the issue persistent.u can also check these steps.
1).The transmission line is faulty,
2).The BTS has a power failure.
3).The TRX of the BTS is faulty.For any query, feel free to ask.
thanks agha , Ur answer was really helpful , but this will lead me to another question playing in my mind for a long time…. what is the root of any E1 in huawei after it reach to the BSC , i mean i can see link magazines like RTN620 in the BSC with E1 cables and i don’t know where these E1’s go into…there is also cabinets in the BSC which contain a large amount of E1 cables and the OSN which have fibers and converting fiber to E1 cables connected to those came from BSC cabinets or whatever , and also when the BSC is near the CO(central office) it connected to it somehow to reach the MSC ,, i don’t no exactly what is going on
Gud Day
Well Shadow,we patch E1 cables just to link two different euipment.like we connect M/W PCM cable to BTS cable by patching in Kronea.and the same process we do in integration to reach to BSC from the Source Cell and than from BSC to MSC.No of E1 cables depends on sort of link(PDH/SDH)or more so there is a cabinet in the BSC to patch in Kronea.Hope u understand.
WHAT IS THE FULL MEANING OF OML AND LAPD.HOW CAN THESE ALARMS BE RESOLVE?
Hi Ades,OML is simply Operation and Maintenance Link thru which we at OMC can reach the BTS.Its a 16/64kpbs TS in the E1.When a BTS fails,(ie e1 is break) the OML also fails and we normally get an alarm ‘LAPD OML fault’.
LAPD is Link access protocol on the D link,a layer2 protocol,ensures error free Transmission.In the BTS normally TRX gets these alarms,straightaway check the e1 or for any loose connections in the BTS.if persists perform the ultimate mastersrtoke.
RESET. ;-D
hi all
just want to ask im new in this ericsson , we r using FE as a transmission medium , our rnc detect alarm OML fault can any body help what is the problemWhat is BCCH missing?
What is meant by LAPD PAGING OVERLOAD? How to resolve???
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