FAQs for ODN Construction

We collected some common Frequently Asked Questions for ODN Construction. In this article, you will have a chance to know.

Why using optical path to test with OTDR will lead to OLT dropped?

In order to maintain the link between the OLT and the ONU, among which has similar heartbeat mechanism. Uplink light source intensity is too large to achieve maximum acceptance of the OLT, the OLT end accept is protected, or saturation, result in the OLT receives less than ONU sending the heartbeat to respond, and dropped.

Palm OTDR series and handheld OTDR

What is the specific meaning of delay compensation and ranging?

When the OLT detected the ONU under the port of PON, it will measure the distance and obtain the delay of every ONU. After that, take other ONU to delay compensate to the maximum delay to get the maximum value, in this way, all the ONU will get the same distance.

PON, ODN, how to get the fault location fast and with the lowest cost?

Based on the SLA set of standard, fast and efficient positioning is bound to be costly. At present, the off-line testing is the Lowest-cost detection technology.

Can we spectroscopically mix the first and two class of FTTH ODN?

ODN in PON system (splitter and fiber) is a passive part, OLT and ONU is no perception of the specific structure of the ODN. ONU under different branches share equal status, only exist difference between the signal attenuation and delay.

How many ONU is a port of OLT connected to?

From the system point of view, you need to consider the uplink and downlink bandwidth on the OLT, the mac address learning number of OLT, of course, the hosted user bandwidth is also a factor to consider for a particular bandwidth applications.

What’s the impact of the upper and lower limit of the OLT and ONU optical power to the EPON transmission?

If the received optical power is greater than the upper limit of the optical module, it is likely to be burned out the module, if it is below the lower limit of the optical transceiver module, the OLT will find not ONU equipment. Besides, the optical module is with transmission distance limit, beyond the limited distance will result in failing to find the ONU.

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