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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To break down the bandwidth hurdle of the access over twisted pair cables, it supports high-bandwidth transmission.
The downstream transmission, i. PON system may be symmetrical or asymmetrical.
PON and fiber infrastructure can also be used for supporting any one-way distributive service. For example — Video at a different wavelength. One of the basic requirements of an optical system is to provide components with sufficient capacity to extend the optical signal to the expected range.
There are three categories or classes of components, which are based on power and sensitivity. PON Core shell consists of two parts. In case, any one fiber out of these two fibers is cut the ONU can be accessed through other fiber. Link protection is also known as link aggregationwhich can protect the link and the same time, it can aggregate the traffic as well. The optical network terminal ONTwhich is connected to the OLT at gpin side for service network interface, has many user-network interface ports.
FTTH – GPON
This combination of the two; together makes the ONT the most cost effective solution to provide GPON services to local and single-family, small, and medium enterprises. However, if a client on campus as students, hostels, schools, colleges, hospitals, or corporate offices, where there is already CAT-5 copper cable is laid, ONU can serve as a more appropriate solution. The GPON ODN, consisting of a single mode optical fiber and cable; the optical fiber ribbon cables, splices, optical connectors, passive optical splitters and passive branching components are very passive.
The ODN optical splitters divide the single fiber into multiple fibers going to different buildings and individual homes. The splitters are designated as [n: It is the data transport scheme in the specified GPON transmission convergence layer. GEM provides a connection-oriented, variable-length framing mechanism for transport of data services over the passive optical network PON. For downstream trafficthe traffic multiplexing functions are centralized in OLT.
The traffic bearing entities within the ONU are granted upstream transmission opportunity or bandwidth allocation by the Mwthod.
It is a recipient of upstream bandwidth allocations within the ONU. The bandwidth allocations to different Alloc-IDs are multiplexed in time as specified by the OLT in the bandwidth maps transmitted downstream. It appears as a single entity for the purpose of upstream bandwidth assignment on the PON. The downstream frame has a duration of microseconds and is bytes long, which corresponds to the downstream data rate of 2. In G-PON systems with the 1. Each upstream frame contains a number of transmission bursts coming from one or more ONUs.
Each upstream transmission burst contains an upstream physical layer overhead PLOu section and one or more bandwidth allocation intervals associated with the individual Alloc-IDs. The downstream GTC frame provides the common time reference for the PON and the common control signaling for the upstream. It has constant-size HEC-protected header. However, it avoids large overhead by allowing variable length frames. GEM supports fragmentation and reassembly.
GEM | GPON Encapsulation Method | Glossary
GEM can fragment its payload. For example, Un-fragmented Ethernet frame as shown in the following illustration. Encryption blocks are aligned to the GTC frame. Constant length frames facilitate QoS for time-sensitive applications.