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Implementing 1:1 and 1:N Interoperability Testing in EPON & GPON setup

Testing of the 1:1 interoperability is quite simple, as illustrated in Figure 1. It includes connecting ONUs/ONTs from Vendor A with one OLT gepon from Vendor B. Analyze would show how successfully the products work together.


olt gepon interoperability testing


Figure 1. 1:1 interoperability testing


In the 1:N testing evaluation of the results is more complicated, since there are more products from multiple vendors. In fact, there is only single device from each manufacturer as shown in Figure 2.


1 to N interoperability testing


2. 1:N interoperability testing


Both testing installations evaluate equipment work on multiple PON layers. Tested layers for GPON are:

  • PMD (Physical Media Dependent) sublayer;

  • TC (Transmission Convergence) sublayer;

  • OMCI (ONT Management and Control Interface) sublayer;

  • Application layer.

The areas of the PON network that are being chosen for test cases are significant for the network operators. The main question is the optimal compatibility – ability to transmit solid signal with fixed wavelength and synchronization level. However, ONU/ONT turnup and management, and service-related functionality testings are of the great value. The VoIP and IPTV services are tested for interoperability.


As Figure 3 shows, testing is performed with the help of traffic generator/analyzer, that provides input and detects received traffic from both ends of the connection. The device can provide specialists with data about packet loss, signal delay, and network throughput.

olt gepon traffic generation

Figure 3. Test setup with traffic generation and analysis


Lomoveishiy – Finland

I needed those to connect my PC on the third floor to have internet access in that room, and ISP installed their modem on the first floor only. After dropping fiber patch cables, plugged in all cables into these media converters at both sides, and link came up instantly. Was much easier than I thought!

Raymond – USA

Great experience – units worked straight out of the box – just needed plug in cables and we were done. I also like the possibility to enable jumbo frames, while we do not have a need for this feature at the current moment it’s great to have this option.

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