8/4/2019 Troubleshooting for Microwave Down&Unstable_Khmer

1/6

Viettel (Cambodia) Pte.,Ltd

VIETTEL(CAMBODIA)PTE.,LTD NETWORK OPERATION CENTER -

No : /Report-NOC : :

microwave l ink

1.

microwave link ? ? ? ?2.

microwave link

2.1 microwave microwave link Microwave link microwave

Issued date: 05/01/2011 Modification times: 00 Page 1/ 6

8/4/2019 Troubleshooting for Microwave Down&Unstable_Khmer

2/6

Viettel (Cambodia) Pte.,Ltd

2.1.1 IDUIDU microwave microwave alarm IDU microwave link

IDU: C: IDU DC IDU

DC DC DC IDU DC IDU

DU : computer IDU IDU RX power

.2 1.3 ardware IDU: hardware IDU

microwave link hardware IDU IDU

2.1.2 Connector

IDU connector connector L I microwave link Connector I Connector L:

onnector IDU (I L) : Connector (Guideline) (Standard) Connector IDU connector

Connector

onnector ODU (I L) : Connector ODU

Issued date: 05/01/2011 Modification times: 00 Page 2/ 6

8/4/2019 Troubleshooting for Microwave Down&Unstable_Khmer

3/6

Viettel (Cambodia) Pte.,Ltd

Connector ODU Connector ODU ODU

Connector ODU connector Connector 90% microwavelink Connector

2.1.3 Cable Jumper Feeder Jumper Feeder microwave link

Jumper Feeder microwave link Jumper Feeder IDU ODU Jumper Feeder

2.1.4 ODU

ODU RF module RF signal ODU module ODU ODU module

2.1.5 Vibrator Vibrator microwave link microwavelink vibrator vibrator RX power

Issued date: 05/01/2011 Modification times: 00 Page 3/ 6

8/4/2019 Troubleshooting for Microwave Down&Unstable_Khmer

4/6

Viettel (Cambodia) Pte.,Ltd

Site 2 Vibrator Vibrator

2.2 Receive PowerReceive Power 2 microwave link receive power microwave link receive power Microwave Link -47dBm -25dBm.

RX Power 8dBm 8dBm ODU site RX Power 80% 20%

ODU opposite site

RX Power < -47dBm Link RX Power > -25dBm Vibrator

: :-47dBm < RX Power < -25dBm Rx Power (>-25dBm), TX Power opposite site TX Power Configure IDU

2.3 Frequency microwave link interference frequency microwave link :

IDU opposite site

channel IDU near site RX Power RX Power

Issued date: 05/01/2011 Modification times: 00 Page 4/ 6

8/4/2019 Troubleshooting for Microwave Down&Unstable_Khmer

5/6

Viettel (Cambodia) Pte.,Ltd

RX Power microwave link channel channel IDU

RX Power channel microwave ODUreceive RX power

channel RX Power receiving frequency and transmitting frequency set IDU opposite site

Set Link Sub band microwave link Subband Sub band interference

2.4 Direction microwave link Link microwave link microwave link

2.4.1 Polarization

Polarization microwave microwave link polarization microwave link polarization polarization

2.4.2 Azimuth

Azimuth Azimuth Azimuth opposite site microwave link azimuth Site

Issued date: 05/01/2011 Modification times: 00 Page 5/ 6

8/4/2019 Troubleshooting for Microwave Down&Unstable_Khmer

6/6

Viettel (Cambodia) Pte.,Ltd

2.4.3 Elevation

Elevation Elevation Opposite Site microwave link

Elevation Site 2.5 (Weather condition) microwave link microwave link

microwave link (2.4) (2.4) link 2.1) microwave

Issued date: 05/01/2011 Modification times: 00 Page 6/ 6