QinQ VLAN application in FTTH PON network

Technical application of FOT PON OLT

What is QinQ Vlan?
The technique is also known as provider bridging, Stacked VLANs, or simply QinQ or Q-in-Q. “Q-in-Q” can for supported devices apply to C-tag stacking on C-tag (Ethernet Type = 0x8100) but this has limited application in the modern methodology of network routing.

Triple Play application introduction

  The FOT PON (includes GEPON, GPON and XG-PON) equipment is suitable for the FTTH / FTTB / FTTC / FTTV application. Usually OLT (Optical Line Terminal) equipment is placed in a residential community or central office.
  An illustration of the FOT OLT’s network diagram is shown in following figure.

Triple Play Application of FOT PON equipment

Triple Play Application of FOT PON equipment

  The OLT can provide subscribers simultaneously with multimedia services such as data, voice and video services, and provide QoS guarantees accordingly. The FOT OLT supports the following three Triple Play solutions:

  1. EPON Triple Play solution
      The EPON ONU uses different VLANs to classify different service flows which are mapped to the same LLID and transported to the FOT OLT series via the EPON line.
  2. GPON single GEM port Triple Play solution
      Supports classifying service flows based on Ethernet type, VLAN ID of subscriber side messages and subscriber side 802.1p domain, and supports control of service flows. This solution is achieved by using the GPON OLT together with the GPON ONT terminals and fiber optic passive component (also known as ODN network).
  3. GPON multiple GEM port Triple Play solution
      Classifies different service flows by different GEM ports, and maps different services to different GEM ports according to VLAN ID, 802.1p, or physical port and then delivers them to the OLT via the GPON line for processing.

QinQ VLAN application introduction

  The FOT OLT series support QinQ VLAN application to overcome restriction on VLAN number resource in network, and allow separation and unique identification of subscribers as well as classification of service types.

The QinQ VLAN network of the FTTH PON

The QinQ VLAN network of the FTTH PON

  Data messages transferred in an IP backbone network have two layers of VLAN tags. On the internal layer is Customer-VLAN tag, and on the external layer is Service-VLAN tag. The roles of these tags in the network are as follows:

  • On the terminal side of the FOT OLT
      Two subscribers’ data and voice services access the OLT via ONUs. The Customer-VLAN tags for data and voice services used by ONU1 are respectively 1001 and 2001; and the Customer-VLAN tags used by ONU2 are 1002 and 2002. When the two subscribers’ services are transported to the OLT by the ONU, they are labeled with Service-VLAN tags according to the different types of data and voice services. Then the subscriber services with double VLAN encapsulation are forwarded to the provider’s network.
  • On the network side of the FOT OLT
      Data messages are transported in the IP backbone network as per Service- VLAN ID. When the messages go downlink and reach the OLT on the opposite end, the Service-VLAN tags of the messages are stripped, and then the messages are transported to ONUs via PON lines. Then the ONUs strip the Customer-VLAN tags of the messages and transmit the data packets to user terminals.

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