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Figure 46 – The most common Open Access Network CO architecture for Smart City
The Network can be divided into following components:

1 GPON Network
2 IP‐MPLS Backbone Network
3 Transmission Network

4 ODN Network
5 Network Management System

Additionally, QoS, Security, VLAN, Redundancy, Service Provisioning, Network Monitoring and Fault
Management are the features which need to be considered while designing the Network.

2.5.5 GPON Network

GPON Network in Open Access Network is based on standard GPON Solution. GPON Ports, Boards
(OLT dimensioning) is done based on standard procedures for GPON Network Design. Type‐B
Protection is preferred choice of the operators for GPON Network. One important and major
difference than the conventional GPON Network is the ONT at subscriber site. There are limited
ONTs which can be used for Open Access Model. ONT models are given below. Please consider this
point while deciding ONTs for your network.

Another important point is that every Service Provider has to provide its own Home Gateway or
Residential gateway which will be connected with ONT to provide the services which have been
subscribed by the end user to that particular RSP. In Standard Open Access Network ONTs provided
by Network Operators are demarcation points for RSPs and Network Operator's Network and actual
Services are not provided by the ONTs provided by Network operators. Anyhow there are scenarios
where Network's operator's ONT can be used for service provisioning but there are limitations in
this scenario. Generally ONTs provided by Network Operators are run in Bridge Mode and Routing,
NATing, Wi‐Fi, Security and Voice Services are provided by HG/RG owned and managed by RSPs.

ITU‐T's Technical Reports and Specifications 279