The considered action type provides two actions: Map to GEM Port action which represents an operation of mapping Ethernet frames to particular GEM Port instance and Map to T-CONT action which represents an operation of mapping GEM Ports to particular T-CONT instance.
Map to GEM Port and Map to T-CONT that correspond to the operation of mapping user traffic flows (packets) to GPON-related traffic entities
In the upstream direction GPON system also utilizes T-CONTs (Transmission Containers) corresponding to allocated timeslots within TDMA multiplexing existing in GPON.
Upstream user traffic (Ethernet frames) is encapsulated into GEM Ports and then into T-CONTs. Each GPON ONT uses its own set of T-CONTs and GEM ports, a unique one within a GPON tree which ONT belongs to.
In practice it means that a significant number of GTC-related traffic instances (GEM Ports and T-CONTs) should be utilized globally within the entire PON tree, especially if a high level of traffic diversity is assumed.
* improving QoS performance in upstream (by using multiple T-CONTs)