Requirements for PON depend on the standard. There are multiple standards developed for different scenarios, but some requirements are true for all the standards. Two single waves are required, one for each direction – upstream and downstream. Usually they are 1310 and 1490 nm respectively. Third wavelength may be provided for downstream video. If so happens it would be 1550 nm.

 

Between the OLT in CO and ONU should be a device that splits in downstream and couples in the upstream direction. This device is passive.

 

Table 1. BPON, GPON, EPON, and XG-PON capacities.

 

	BPON	GPON	EPON	XG-PON
Downstream	155.52 Mbps622.08 Mbps	1.244 Gbps2.488 Gbps	1 Gbps	9.952 Gbps
Upstream	155.52 Mbps622.08 Mbps	155.52 Mbps622.08 Mbps1.244 Gbps 2.488 Gbps	1 Gbps	2.488 Gbps

 

There are standard means of measuring the QoS for different configurations. It helps to manage performance of all the system components. A medium access control is managing efficient upstream data sharing capacity.