[Mohammad Morshed Alam]

why jumper cable is used between GSM antenna & feeder cable

[Cris]

Hi Mohammad,

It is ideal to connect the main feeder cables to the antenna, to reduce loss due to connectors and additional cables, but….

since the main feeder cables are so hard to bend (not recommended). Jumper feeders are used (with length limitations or 3m) to connect to the antenna

[Hubert]

Hi Patrick,

I am Hubert working for a Nokia project as BTS Engineer

I have a problem on Channel Failure Rate, on a certain timeslot specifically Timeslot 1 which has the SDCCH. Quality Engineers always ask for TRX replacement, is it really necessary, or are there BSC parameters needed to be corrected.

Also, Why is it that Timeslot 3 and 4 during TRX test on the TRX that has the MBCCH gives “invalid Channel Configuration” during the test. TRX test is done when site is on air. What is allocated for TRX 3 and 4 timeslot is it the GPRS allocation defined at the BSC?

I hope to be cleared on the queries .

Thanks

[Nokia Trainer]

Gustavo:

The purpose for the 13 MHz port is to adjust the RX clock (coming out from the E1/T1 line) with the internal clock inside the BOIA card.

when working with it you have to use a freq counter (10 digit precision), connect it to 13 MHz port, open Clock Control feature (under Objects menu), disable al previous adjustments and slide the bar until you have a reading of 13 MHz flat in the counter. Remember that prior to any adjustment you have to let the BOIA and freq counter to warm up, meaning that you have them powered up and connected for 1 hour at least, then you start the process.

if there’s any question, please let me know.
ricardo

[Nokia Trainer]

Mohammad,

what Cris is saying is correct, most manufacturers use them because the feeder is hard to blend and since you need to do sharp turns when getting close to BTS, you need a more flexible feeder (jumper) to reach the BTS cabinets.

ricardo

[Nokia Trainer]

Vito,

you can not cancel the MML idle time, however you can increase such time using ZIAX command. So you will have to open MML session from NetAct and modify it.

ricardo

[Nokia Trainer]

Jadee

FXC RRI, FXC E1/T1, FXC E1 & FXC STM-1 cards are interchangeable between Ultra & Metro site equipments, of course you will use any of those options according to transmission needs.

By the way, Metrosite doesn’t have a separate application called Hub Manager (there’s no hub, only 1 card), however you can use Traffic Manager and Cross connections like the UltraSite

ricardo

[patrick.fr]

Hubert – 25 Jul 2007

TRX test on time slot 3&4 “invalid Channel Configuration” is normal, i don’t why or explain.
Test is impossible when trx has MBCCH.
(with city talk, same think)

Have you got another alarm? Statistic of your BTS are OK?

[patrick.fr]

CRIS – 11 Jul 2007
NED explanation =>

8202 LOSS OF SUPERVISION CONNECTION
Meaning
A piece of equipment has detected a supervision connection fault.
This alarm affects the provided services.
Supplementary information fields
1 01 BSC supervises the equipment
02 BTS supervises the equipment

2 Q1 address of the piece of transmission equipment

3 the functional entity number specifies a physical unit of the
transmission equipment, for example a plug-in unit or a
daughter board. The number can be 0…254

4 the supervision block number specifies the faulty part of the
functional entity, for example a certain line interface or component

5 number of the Q1 service channel in the BSC, 0…27.
If equipment is supervised by the BTS, the channel number
is not relevant

6 name of the piece of transmission equipment.
Not included if the name is in the alarm object field of
the alarm printout.
See alarm instructions

7 number of the piece of transmission equipment.
Not included if the index is in the alarm object field of
the alarm printout.
See alarm instructions

8 rack (cabinet) number
FF = not defined
Included only if the equipment is supervised by a BTS that
supports coordinate settings

9 shelf number
FF = not defined
Included only if the equipment is supervised by a BTS that
supports coordinate settings

10 slot
FF = not defined
Included only if the equipment is supervised by a BTS that
supports coordinate settings
Instructions
Check Supplementary information field 1 to see whether the BSC or
the BTS supervises the equipment.

If the BSC supervises the equipment, use the MML commands Axx for
alarm administration.

If the BTS supervises the equipment, use the MML commands EOx for
alarm administration.

To clarify the reason for the fault, take a remote session to
transmission equipment and display fault information.

[Author]

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