How can i find tentative distance between DWDM(6800/8800) equipment in my existing network? Is there any way to find tentative value from U2000. Any suggestion would be appreciable

Thanks

Hi,

Im sorry for reply late.

I have forward your problems to the owner, pls wait for the answer.

Thank you.

Hi
U2000 and Huawei’s WDM equipments do not still provide the function to measure the distance between two WDM NEs. But the information about the fiber between WDM equipments (such as distance, direction, attenuation) can be recorded on U2000 with two ways below.
1. The information about the fiber can be exportted from MDS6600 (the Huawei’s planning and designing software of transmission network) to U2000. The prerequisite for this way is that your network has been designed by MDS6600.
2. The deploying engineers can input the information about the fiber manually on U2000 during the networking commissioning.
If one of the ways above has been done already, you can query the properties of the fiber on U2000.

 

 

You can calculate approximate distance by OSC channel power. Just calculate difference between output power on transmite interface of OSC channel (SC1/SC2/TC1/TC2)  in one station and input optical power in receive station. Than devide calculated attenuation by 0.2 (0.2 dB/km) and you will get approximate distance:

L = (OutPower - InputPower)/0.2

For example:

SC1 out power is -4dBm

SC1 in power on opposite station is -22 dBm

L = (-4 - (-22))/0.2 = 18/0.2 = 90 km

Hi, Tina amd V83174

Thanks for your reply and its helped really. 

Dear raihan118,
Your are always welcome. :)

Dear Tina,

Without MDS6600, cannot we actually measure the exact distance between two NE of DWDM ?

Dear V83174,

Could you please assist me by telling that, Should I consider insertion loss, fiber splicing loss etc for calculating exact distance. I think, I cannot measure the exact distance theoretically if I am not wrong. But the more accurate I can, is better for me at this point.

Thanks

All,

No one has mentioned using an OTDR on a spare fibre. That will give you fairly exact figures.

Del

Dear deljeffery,

Thanks for your feedback. Would you please tell me the procedure more in details.

Appreciate if you share your feedback and any relevant document as well if available.

Dear raihan,

I will find an expert(jammy.fanxiaoke) to reply you, and befores reply was from him too.