H35-210_V2.5 Exam Dumps : HCIA-Access V2.5 Exam

Increased stability and long delay

Increased stability and short delay

Poor stability and long delay

Poor stability and short delay

Each T-CONT is composed of one or more GEM Ports, and each GEM Port carries a service flow. A T-CONT can carry data streams of one or more types of services.

Each GEM Port is identified by a unique Port-ID. The Port-ID ranges from 0 to 4095 and is globally assigned by the OLT. That is, each ONU/ONT under the OLT cannot use GEMs with repeated Port-IDs. Port.

GEM Port identifies the service virtual channel between the OLT and ONU/ONT, that is, the channel that carries the service flow, similar to the VPI/VCI identification in the ATM virtual connection.

Each GPON port supports up to 32 ONU/ONT

The EPON standard is one of many TDM-PON standards and has the basic characteristics of a TDM-PON network: a tree topology network is composed of OLT, ONU and ODN (Optical Distribution Network).

In the logical topology, the EPON protocol establishes a logical link for the OLT to each ONU, and the leading byte of the Ethernet data frame carries the logical link identity, that is, LLID (Logical Link Identity).

The downstream data stream from the OLT to the ONU is encapsulated as an Ethernet message, and the corresponding LLID is attached and sent in the tree PON network. The optical splitter in the ODN broadcasts the data stream to each branch, and all ONUs can receive the downlink Ethernet data frame, and selectively receive their own data according to the LLID.

In the upstream direction from the ONU to the OLT, each ONU uses the broadcast mode to share the upstream bandwidth.