15 RA4540FEN07GLA1 Flexi WCDMA BTS Troubleshooting RU30 Ppt 2

RA4540FEN07GLA1

Flexi Multiradio BTS WCDMA Troubleshooting

1

RA4540FEN07GLA1


2

RA4540FEN07GLA1


3

RA4540FEN07GLA1


4

RA4540FEN07GLA1


5

RA4540FEN07GLA1


6

RA4540FEN07GLA1


7

RA4540FEN07GLA1


8

RA4540FEN07GLA1


9

RA4540FEN07GLA1


10

RA4540FEN07GLA1


11

RA4540FEN07GLA1


12

RA4540FEN07GLA1


13

RA4540FEN07GLA1


14

RA4540FEN07GLA1


15

RA4540FEN07GLA1


16

RA4540FEN07GLA1


17

RA4540FEN07GLA1


18

RA4540FEN07GLA1


19

RA4540FEN07GLA1


20

RA4540FEN07GLA1


21

RA4540FEN07GLA1


22

RA4540FEN07GLA1


23

RA4540FEN07GLA1


24

RA4540FEN07GLA1


25

RA4540FEN07GLA1


26

RA4540FEN07GLA1


27

RA4540FEN07GLA1


28

RA4540FEN07GLA1


29

RA4540FEN07GLA1


30

RA4540FEN07GLA1


31

RA4540FEN07GLA1


32

RA4540FEN07GLA1


33

RA4540FEN07GLA1


34

RA4540FEN07GLA1


35

When wrongly using the two wires of a twisted pair for different directions (TX and RX), the principle of balanced signals will NOT have its positive effect of elimination of common mode interfering signals.

In opposite, both signal (TX+RX) will interfere with each other, the more, the longer the cable length is. Signal quality will be degraded (bit errors).

Also alarm management is affected: In case one end of the cable is disconnected from the terminal, the alarm loss of signal would be expected. But due to induction from the TX to the RX wire, there might be an incoming signal detected. No alarm at all or for instance LOF or LOMF would be generated instead.

RA4540FEN07GLA1


36

Common mode disturbances are eliminated by the balanced (= symmetric) signal structure. Due to the twisted pair cable mechanics any electromagnetic disturbance should have the same effect on both wires of a twisted pair, the TX A and TX B oor RX A and RX B. By the twisting of the wires it is made sure that one wire can not shield the other wire agains a certain direction.

The input stage (on the IFUA/AXCC) of the balances E1/T1 interface uses a differential amplifier design to filter out all common signal components between the A and B inputs. What remains is the pure PCM signal as it was sent from the far end E1/T1 transmitter.

RA4540FEN07GLA1


37

RA4540FEN07GLA1


38

Unbalanced signal are not so well protected against EMI. The interference level mainly depends on the Cable length and the quality of the screen (= shield).

RA4540FEN07GLA1


39

RA4540FEN07GLA1


40

RA4540FEN07GLA1


41

Workaround:

1. Check that the connections have been made according to the installation document

2. Check the capacity of the connector. Opt-RF1 and Opt_RF3 support 4 cells, Opt-RF2 support 2 cells.

RA4540FEN07GLA1


42

Easy way on site is to use torch to see if light can be seen in far end. But this is very coarse check!

RA4540FEN07GLA1


43

RA4540FEN07GLA1


44

RA4540FEN07GLA1


45

RA4540FEN07GLA1


46

RA4540FEN07GLA1


47

RA4540FEN07GLA1


48

RA4540FEN07GLA1


49

RA4540FEN07GLA1


50

RA4540FEN07GLA1


51

RA4540FEN07GLA1


52

RA4540FEN07GLA1


53

Iub accuracy requirement

To meet the BTS Air interface accuracy requirement +/- 0.05 ppm (set by 3GPP), the Iub interface must meet the long-term accuracy of +/- 0.015 ppm.

This kind of accuracy is attained if the network master clock (PRC) fulfills the ITU-T recommendation G.811 and the synchronisation of the network is correct.

The maximum jitter/wander of the Iub interface is specified in the ITU-T recommendation G.823.

Another possibility is that the BTS master clock reference comes via the AXU reference clock interface. The Iub accuracy requirement above also applies for the AXU reference clock interface.

RA4540FEN07GLA1


54

The following clocks are used:

TRCLK, transmission derived clock, 2,048 MHz, from Iub to the WSCA unit

BRCLK, baseband reference clock, 61.44 MHz from the WSCA unit via WCI module to the WAM, WSM and WTR units

REFCLK, synchronization clock output for the next BTS cabinet, 30.72 MHz

REFRCLK, synchronization clock input from the previous BTS cabinet, 30.72 MHz

SFCLK, system frame clock 100 Hz, from the unit front panel for testing purposes

TESTCLK, 10 MHz, from the front panel as measurement device reference

RA4540FEN07GLA1


55

RA4540FEN07GLA1


56

RA4540FEN07GLA1


57

RA4540FEN07GLA1


58

RA4540FEN07GLA1


59

BTS Tuning History

Time GMT

The Time column shows the measurement date and time. The time format is localised.

Source

The Source column shows the synchronisation source.

DAC Word

The DAC Word column shows the DAC word value.

Tuning

The Tuning column shows the tuning mode: Normal, Manual or Fast.

Difference ppm

The Difference ppm column shows the frequency difference () between the BTS clock and the external reference clock. When the tuning mode is Manual, "N/A" is shown in the cell.

Rejected Samples %

The Rejected Samples % column shows the rejected samples as percentage value. When the tuning mode is Manual, "N/A" is shown in the cell.

RA4540FEN07GLA1


60

BTS Tuning History

Time GMT

The Time column shows the measurement date and time. The time format is localised.

Source

The Source column shows the synchronisation source.

DAC Word

The DAC Word column shows the DAC word value.

Tuning

The Tuning column shows the tuning mode: Normal, Manual or Fast.

Difference ppm

The Difference ppm column shows the frequency difference () between the BTS clock and the external reference clock. When the tuning mode is Manual, "N/A" is shown in the cell.

Rejected Samples %

The Rejected Samples % column shows the rejected samples as percentage value. When the tuning mode is Manual, "N/A" is shown in the cell.

RA4540FEN07GLA1


61

RA4540FEN07GLA1


62

RA4540FEN07GLA1


63

RA4540FEN07GLA1


64

RA4540FEN07GLA1


65

RA4540FEN07GLA1


66

Log example from WAM Start.log of Optima Compacts faulty fan after receiving alarm: WFA fan unit speed reduced from set speed

75 WAM_10: O&M ERROR/CLIC, Damaged fan = 50, fan

speed = 0, led colour = 2

76 WAM_10: O&M DEBUG/RAW_ALARM, #STARTUP

UHND::AlarmHandling sending alarm 0 of unit 0x73 TR_WFA

RA4540FEN07GLA1


67

RA4540FEN07GLA1


68

RA4540FEN07GLA1


69

RA4540FEN07GLA1


70

RA4540FEN07GLA1


71

Workaround:

1. Configure loops in order to analyze in which end or direction the problem exists.

RA4540FEN07GLA1


72

RA4540FEN07GLA1


73

RA4540FEN07GLA1


74

Workaround:

1. In RNC Object Browser, lock all WCells in BTS

2. Modify WBTS

3. Delete WBTS connection configuration settings from the fields and press OK

4. Retype WBTS connection configuration settings and press OK

RA4540FEN07GLA1


75

RA4540FEN07GLA1


76

Workaround:

1. Analyze according performance monitoring the direction of the fault. If another counter is 0, troubleshoot that end accordingly.

RA4540FEN07GLA1


77

RA4540FEN07GLA1


78

A2EA in Flexi

-> 49 + 5 digit BTS id + 000

RA4540FEN07GLA1


79

PID in Flexi BTS

-> BTS ID + 00 + sequence number of AAL2UP VC

RA4540FEN07GLA1


80

RA4540FEN07GLA1


81

RA4540FEN07GLA1


82

RA4540FEN07GLA1


83

RA4540FEN07GLA1


84

RA4540FEN07GLA1


85

RA4540FEN07GLA1


86

Problem is in PSN Tunnel not Pseudowire

Check IP Address and Subnet Mask

RA4540FEN07GLA1


87

RA4540FEN07GLA1


88

RA4540FEN07GLA1


89

ZRII Command to find out Route number in RNC e.g:

Flexi WCDMA BTS Number 7 is on Route number 4

4900007000 0 4 ROU NGC 0 0 APR 4 4

RA4540FEN07GLA1


90

ZLJI Command in RNC MML to show Path States

RA4540FEN07GLA1


91

RA4540FEN07GLA1


92

RA4540FEN07GLA1


93

RA4540FEN07GLA1


94

ZQRS Command will show all active TCP Connections in RNC (Has to be on Active OMU)

RA4540FEN07GLA1


95

RA4540FEN07GLA1


96

Documents

15 RA4540FEN07GLA1 Flexi WCDMA BTS Troubleshooting RU30 Ppt 2