Network failure detection and MW failure disposition. Provided by BEIJING DG TELECOMMUNICATIONS EQUIPMENT CO.LTD. Network failure detection. Failure detection.
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Provided by BEIJING DG TELECOMMUNICATIONS EQUIPMENT CO.LTD
The mw link is ok in this case, first check whether there has AC Power.
If there AC Poweris available, do the loopback test at BSC side first.
If BSC is ok, the E1 patching may have caused this problem ,the maintenance engineer would go to check.
If there has no down site of the site:
ZTE maintenance engineer should check whether there has AC Power by OMC firstly. Then check the mw equipment by mw NMS. If there is problem of the mw equipment, DG maintenance engineer would go to check the mw equipment.
If there is AC Powerand the mw is ok too, do the loopback test at BSC side.
If the BSC is ok, the E1 patching might have caused this problem, maintenance engineer should go to check it.
1,Power light is not on: the power module of IDU is broken, replace it.
2,Cable light is not on: IF cable or ODU problem.
3,ODU light is red: replace ODU.
4,Run light is not blink: restart IDU, if the problem is same as before, then replace IDU.
Use the cat-5 cable to connect the NMS interface of IDU and the network port of laptop, then open the IE ,input the local ip address which is showed on the IDU (Detail instruction is in the 5.2-USING WEB of guide instruction)
Check the technical parameter on the homepage.
One: Whether IDU is connected with ODU.
When it is not , the homepage shows :NO DATA FROM ODU RF POWER=OFF , so we can know there is problem of the IDU or ODU:
1，Check whether the output voltage at the N interface of IDU is normal, the normal value is +24V, if it is not, the IDU is broken
2，If the output voltage of IDU is normal, check the connection wire
3，If the above two items are all ok, use multimeter to test N connector of ODU ,Switch to LED, when the direct test is high impedance, the value of reverse test is around 542, the IDU is broken otherwise the ODU is broken.
Two: Check the RXL of equipment
check RXLEV=? on the homepage
the operation range:
If the RXL is less than the RXL alarm threshold, the equipment can’t work normally, continue checking the equipment to recover the normal RXL.
Normally the RXL is larger than-50dBm. If the actual RXL is less than -50dBm,we should increase the RXL by increasing the TX power or align dish. The best RXL range for equipment is -30~-35dBm
Three: Check the TX power
Check the TX POWER=? On the homepage
If it shows TX power=OFF, the equipment won’t work, we can switch the TX power to solve this issue. The method is click the LINK CONFIG, then type the username: sstar, password: test, choose the available value at the drop-down menu of TX power(-10~20dBm), then click OK. Finally click SAVE CONFIG to finish adjusting the TX power of ODU.
After adjusting the TX power, check the RX power of far end site. Find the best RX power value by increase/decrease TX power
The TX frequency of local site must be equal to the RX frequency of far end site, and the RX frequency of the local site must be equal to the TX frequency of far end site.
Check TX=?RX=? on the homepage, compare this with far end sites, If it does not match, modify the frequency. The method is :click LINK CONFIG, type username: SSTAR, password: TEST, choose available value on the drop-down menu of chan, click SET, finally click SAVE CONFIG to finish the modification.
After modify the frequency check it on the homepage to confirm it’s modified correctly.
Click WEST TRIB CONFIG to check the equipment capacity, if it’s different from remote site, we should modify it. The method is: choose the correct capacity on the drop-down menu of capacity(8MB,16MB,34MB),click Ok, then save the configuration.
If the configuration, power, and frequency are all ok, but the transmission is down, By the loopback function we can know it’s local site or far end site problem also we can know it’s IDU or ODU problem. Method is:
Click LINKCONFIG, type the username and password, choose “on”on the drop-down menu of loopback, then back to homepage, check the rxlev. If it’s larger than -65, and the indicator light of IDU,ODU and RA are all off, it means the local site equipment is ok and the far end site equipment is broken .Unlock the RF loopback after the loopback test.
Notice: On the TX- High side, use the lower frequency when do the RF loopback, at the TX –LOW side, use the higher frequency when do the RF loopback test.