This topic introduces the PON access functions supported by AN5516 series OLT, and GPON and EPON Card Comparison.
EPON Access Function
EPON is a long-haul Ethernet access technology based on optical transmission networks. Compliant with IEEE 802.3ah, EPON uses the point-to-multipoint (P2MP) architecture and single-fiber WDM technology (the downlink central wavelength
being 1490 nm, and the uplink central wavelength being 1310 nm) to enable bidirectional transmission over a single fiber.
As a mature PON technology, EPON features low cost, high bandwidth, good scalability, compatibility with existing Ethernet, and easy management. Accordingly, EPON is widely applied to carrier networks
Advantages of EPON application
Low cost: The maintenance, extension and upgrading are easy with a low cost.
High bandwidth: Currently, EPON can provide symmetric bandwidth up to 1.25Gbit/s in uplink and downlink directions. With development of Ethernet technology, the bandwidth can be smoothly evolved to 10 Gbit/s.
Flexible bandwidth allocation and assured service quality: A sound system is provided to guarantee bandwidth allocation. Queue scheduling mechanisms including differentiated services (DiffServ), priority queue (PQ) / weighted fair queuing (WFQ), and weighted random early detection (WRED) are applied to bandwidth allocation to ensure quality of services for each subscriber.
GPON Access Function
Gigabit Passive Optical Network (GPON) is a PON technology defined in ITU-T G.984x series of standards. The figure below shows the network structure of GPON.
The GPON access technology provides high-bandwidth transmission, overcomes the bandwidth bottleneck faced by access over twisted pairs, and caters to users’demand for high bandwidth services.
Advantages of GPON application
High density: Supports a split ratio of 1:128. A GC8B card supports access of 1K subscribers; and a GCOB card supports access of 2K subscribers.
High bandwidth: Currently, GPON can provide a bandwidth of 1.25 Gbit/s in the uplink direction and 2.5 Gbit/s in the downlink direction. The bandwidth can be smoothly migrated to 10 Gbit/s.
Hierarchical quality of service (HQoS): Ensures that 4K-resolution video programs are not suspended in case of bandwidth congestion.
FEC function: Enhances fault tolerance of the system to ODN errors
GPON and EPON Interface Card Comparison
The Fiberhome AN5116 series OLT subracks are designed with different capacity, and can be configured with various service cards to support multiple access scenarios. With regard to access capacity, the AN5116 series OLT can be classified into large-, medium- and small-sized ones to cater for different access demands:
· Large-sized AN5516-01/AN5516-06B: with 16 service slots deployed in a central office.
· Medium-sized AN5516-06: with 6 service slots deployed in a central office.
· Small-sized AN5516-04: with 2 service slots, deployed flexibly in sparsely-populated areas.
Below table is the Fiberhome GPON/EPON service card parameters comparison:
|PON service card||EPON||GPON|
|Application||AN5116-06B, AN5516-06, N5516-04|
|Type||4×EPON-C Interface Card||8×EPON-C Interface Card||16×EPON-C Interface Card||4×GPON-B Interface Card||8×GPON-C Interface
|Interface type||SC / PC||SC / PC||SC / PC||SC / PC||SC / PC||SC / PC|
|Number of Single VLANs||4K||4K||4K||4K||4K|
|Number of Translated VLANs||16K||16K||8K||8K or 16K||32K|
In summary, this article has focused on the Fiberhome GPON/EPON comparison and the Fiberhome AN5116 series OLT PON service card parameters. Hope you can better know how to choose your Fiberhome FTTx solution.
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