BTS and TC unsync in Nokia BSC 3i

After commissioning hop, frequency is stored in IDU or ODU?

2993 alarm came blz you have mismatching of bts manager.

BGV05 MCMU-0 TRANSM 2012-09-12 07:39:23.15
** ALARM …….. RRM_BX
(7902) 2993 BTS AND TC UNSYNCHRONIZATION CLEAR CALLS ON ABIS INTERFACE
35d 7d 03 166d 10d 7d

Here’s the information from Nokia on this alarm. My comments are in RED

2993 BTS AND TC UNSYNCHRONIZATION CLEAR CALLS ON ABIS INTERFACE
Meaning
Calls have been cleared three successive times on the same Abis interface
channel due to BTS and transcoder unsynchronisation.
Meaning: The TCH in the traffic manager does not match the TCH built in the BSC which is causing calls to drop when a call is placed on that TRX.

Supplementary information fields
1 identifier of the base station This is the BTS number. In the alarm above, it’s 35d

2 identifier of the TRX In the alarm above, it’s the first 7d from left to right

3 identifier of the radio time slot In the alarm above, it’s 03

4 number of external PCM circuit In the alarm above, it’s 166d

5 time slot of external PCM circuit In the alarm above, it’s 10d

6 sub-time-slot of external PCM circuit In the alarm above, it’s the LAST 7d from left to right

When you compare this to the ZEEI output of the site you’re looking at, you can check these values to see if they are on your site.

BSC3i BGV05 2012-09-21 09:44:26
RADIO NETWORK CONFIGURATION IN BSC:
E P B
F T R C D-CHANNEL BUSY
AD OP R ET- BCCH/CBCH/ R E S O&M LINK HR FR
LAC CI HOP ST STATE FREQ T PCM ERACH X F U NAME ST /GP
===================== == ====== ==== == ==== =========== = = == ===== == === ===

BCF-0034 ULTRASITE U WO 3 BC034 WO
08015 41861 BTS-0034 U WO 1 0
177P0186A RF/- 4
EDGE TRX-001 U WO 683 0 42 MBCCH+CBCH P 1
EDGE TRX-002 U WO 562 0 42 5
08015 41862 BTS-0035 U WO 0 0
177P0186B RF/- 1
EDGE TRX-005 U WO 673 0 42 MBCCH+CBCH P 0
EDGE TRX-006 U WO 570 0 42 1
EDGE TRX-007 U WO 576 0 166 3
08015 41863 BTS-0036 U WO 0 0
177P0186C RF/- 3
EDGE TRX-009 U WO 677 0 42 MBCCH+CBCH P 5
EDGE TRX-010 U WO 566 0 42 0

HeLLo @LL Noki@ TRUE DSP hardware slide in module <PCS 1900 TRUE Hardware/software interface> and PCS 1900 Backplane 🙂 Thisis RoB Wilding BACK :-)(-….Nokia Hybrid SMART Antenna (HSA) and PCS 1900 Nokia Testbed, Camberley.

Tapio Saari (Nokia Finland was actually working on this PCM DSP hardware/software interface. He was working in the Nokia systems team with me Nokia 1995 to 1997. Tapio was responsible for software configuration management and upgrade of Nokia PCS 1900 TRUE DSP slide in module including PCB hardware tight clearance backplane fit, DSP card grounding between BSS ground plane, TRUE DSP card fault finding and diagnostic tests and PCB fault finding and solder joint inspection,

I was working along side Tapio ensuring that this DSP card was properly grounded to the base station and ensuring that the TRUE DSP module boots up properly and in the correct sequence and ensuring that sufficient time was elapsed before no RED ERROR LED was displayed and after 20 – 30 minutes the performance of the TRUE DSP PCM ABIS interface was stable, and a constant GREEN LED was displayed…!!!

KinD ReG@rd<e>

RoB WilDinG B Eng(Hons.) MSc. MIOEE