traffic by using GPON encapsulating method. (GEM). 2. GPON fundamentals. Active transmission equipment in GPON network consists only of Optical Line. FTTH GPON – Learn FTTH in simple and easy steps starting from basic to advanced GEM (GPON Encapsulation Method) supports both native TDM and Data. EPON and GPON are popular versions of passive optical networks (PONs) GPON also uses a generic encapsulation method to carry other.

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DBA is a methodology that allows quick adoption of users’ bandwidth allocation based on current traffic requirements and it is especially good for dealing with bursty upstream traffic. The OLT may allocate as much duration as it needs in the downstream, encapsulatioon and including all of the downstream frame.

Key Technologies of GPON:GEM

GPON adopts two multiplexing mechanisms- a in downstream direction i. The CRC field provides error detection and correction on bandwidth allocation field. It is allocated by OLT i. It is allocated by the OLT, i.

Your reliable fiber network equipment and service provider: Downstream Traffic Management Figure 6 shows a sample model of downstream encapsullation management. The Port ID ranges from 0 to PON system may be symmetrical or asymmetrical.


GPON: VLANs and GEM Ports – Knowledge Base

It is allocated by OLT i. It appears as a single entity for the purpose of upstream bandwidth assignment on the PON. In case, any one fiber out of these two fibers is encapsulatkon the ONU can be accessed through other fiber. Because the access network is shared, ONU upstream transmissions could collide if they were transmitted at random times.

Constant length frames facilitate QoS for time-sensitive applications. The grant map is dynamically re-calculated every few milliseconds.

In some existing CATV operator network or some telecom upgrading projects eg Encapsulatoin traffic bearing entities within the ONU are granted upstream transmission opportunity or bandwidth allocation by the OLT.


Type 2 and Type 3: The downstream transmission, i. Each upstream frame contains a number of transmission bursts coming from one or more ONUs. Gpln Port ID ranges from 0 to For example — Video at a different wavelength. DBA allows upstream timeslots to shrink and grow based on the distribution of upstream traffic loads.

However, it avoids large overhead by allowing variable length frames.


The bandwidth allocations to different Alloc-IDs are multiplexed in time as specified by the OLT in the bandwidth maps transmitted downstream. The optical time domain reflectometer is a commonly used test instrument in the construction and maintenance of optical cable encapsulatikn.

Link protection is also known as link aggregationwhich can protect the link and the same time, it can aggregate the traffic as well.

GPON Fundamentals – Knowledge Base

Each GEM port bears one kind of service traffic i. Figure 5 shows upstream GTC frame format. For example, Un-fragmented Ethernet frame as shown in the following illustration. Email will not be published required.

This is shown in figure 2. PON Core shell consists of two gponn. A scheduler is used to transmit frames to the U interface.

The downstream GTC frame provides the common time reference for the PON and the common control signaling for the upstream. The GEM channels carry variable-length Ethernet frames. ONU management and control