A GE optical port cannot be used for P2P FE optical access.
Hardware Support
The OPFA board and the FE ONTs need to support the feature of P2P FE optical access.
2.1.5 Principle
Figure 2-1 shows the implementation of the P2P FE optical access.
Figure 2-1 Implementation of P2P FE optical access
PC Phone
IPTV P2P ONT
STB
OPFA OPFA
SCU
OLT
FE ...
The upstream packets sent from the user end are processed as follows:
1. After modulation on the ONT, the upstream packets are sent to the OPFA board of the MA5600T/MA5603T through a fiber.
Module
Feature Description 2 P2P Optical Access
2. The OPFA board processes the upstream packets according to the user's configuration, and then sends the processed packets to the control board of the MA5600T/MA5603T through the backplane bus.
3. After receiving the packets, the control board forwards the packets to the upper layer network through the upstream port.
The downstream packets sent from the network end are processed as follows:
1. The downstream packets from the upper layer network reach the control board of the MA5600T/MA5603T through the upstream port.
2. The control board forwards the packets to the OPFA interface board through the backplane bus according to the learning results during the upstream forwarding.
3. The OPFA board processes the downstream packets, and sends the processed packets to the user end.
2.2 GE P2P Optical Access
The OPGD, OPFA, SPUA, and ETHB boards supports P2P optical access. Among these boards, the OPFA implements FE optical access, and the OPGD, SPUA, and ETHB boards implement GE optical access. In the following, description will focus on the applications of the OPGD board.
2.2.1 Introduction
Definition
GE point-to-point (P2P) Ethernet optical access is a mode in which P2P Ethernet optical access boards provide GE ports and coordinate with downstream devices to implement various optical access solutions for users. The solutions include FTTC/FTTB, FTTH, FTTO, and FTTM.
The OPGD board is a new GE P2P optical access board developed for V800R008 and is mainly used for FTTH household user access and for DSLAM convergence. The OPGD board also supports FTTM (mobile bearing) and FTTO (enterprise users).
Purpose
P2P optical access boards prior to OPGD include OPFA, ETHB, and SPUA. The following table lists the ports provided and scenarios supported by each board. Compared with other P2P optical access boards, the OPGD board features more advantages for the access and the subtending scenarios.
Module
Feature Description 2 P2P Optical Access
Board Port Application Scenario
OPFA 16 FE optical ports It can be directly connected
to home user terminal (ONT) only and does not support subtending or upstream transmission.
It is connected to the ONT to implement FTTH and provides a 100 Mbit/s bandwidth to each household.
OPGD 48 GE optical ports It supports the access and
subtending scenarios and does not support upstream transmission.
l In the access scenario, it is connected to the ONT to implement FTTH and provides a 1000 Mbit/s bandwidth to each household.
l In the subtending scenario, it is connected to the DSLAM, CBU, or SBU to implement FTTC/
FTTB, FTTO, or FTTM respectively.
Module
Feature Description 2 P2P Optical Access
Board Port Application Scenario ETHB 8 GE optical/electrical ports It supports subtending and
upstream transmission, but cannot be directly connected to home user terminal.
l In the subtending scenario, it is connected to the DSLAM to implement FTTC/FTTB.
Through the convergence by the DSLAM, each GE port can provide services for a large number of users.
l In the upstream
transmission scenario, the ETHB board functions as a GIU upstream interface board. It extends the number of upstream ports in the system to increase the total upstream bandwidth of the system.
SPUA 8 GE optical ports+2 10GE
optical ports
It supports subtending and upstream transmission, but cannot be directly connected to home user terminal.
l In the subtending scenario, it is connected to the DSLAM to implement FTTC/FTTB.
Through the convergence by the DSLAM, each GE port can provide services for a large number of users.
l In the upstream
transmission scenario, it provides a high upstream forwarding bandwidth. It implements upstream link backup by inter-board aggregation and inter-board protect group.
The OPGD board provides GE P2P Ethernet optical access for more flexible FTTx solutions at higher bandwidth, lower costs, and higher reliability.
Module
Feature Description 2 P2P Optical Access
l Higher bandwidth. Traditional FE P2P optical access provides only a 100 Mbit/s
transmission rate, but GE P2P optical access allows for 1000 Mbit/s. The FTTH solution implemented through GE P2P optical access can provide a higher bandwidth for users, thus meeting the requirements of high-end users.
l Lower costs. Compared with SPUA and ETHB, which are capable of both upstream transmission and subtending, the OPGD board is specially designed for subtending and access scenarios. The OPGD board provides 48 GE ports, so it can be subtended to more DSLAMs and hence reduces the costs of FTTC/FTTB networking.
l Higher reliability. The OPGD board allows a higher reliability in the DSLAM subtending scenario through features such as inter-board aggregation, smart link, and ring check.
l More flexible scenarios. The OPGD board coordinates with a variety of downstream devices (such as the DSLAM, ONT, SBU, and CBU) to implement FTTC/FTTB, FTTH, FTTO, and FTTM. An MA5600T/MA5603T configured with the OPGD board can not only be directly connected to access terminals but also subtend DSLAMs in order to converge a large number of users.
Benefit
Benefits to carriers
One MA5600T/MA5603T can support multi-access such as GPON, xDSL, and P2P. Such an All-in-one solution reduces the equipment CAPEX as well as OPEX for carriers.
Benefits to users
Because the OPGD board can provide high-density GE ports for subtending DSLAMs, which converge massive users, lower costs are needed for providing end-to-end service guarantee for VIP household and enterprise users. In residential communities where optical fibers are already deployed, a 1000 Mbit/s bandwidth can be provided for high-end users exclusively, meeting the user needs for HD video, voice, and data integrated services.
2.2.2 Specifications
The OPGD board supports two application scenarios: access and subtending.
l In the access scenario, the OPGD board is connected to the ONU to implement FTTH.
l In the subtending scenario, the OPGD board is connected to the DSLAM, CBU, or SBU to implement FTTC/FTTB, FTTO, or FTTM respectively.
l The two application scenarios cannot be implemented on the same OPGD board at the same time but can be implemented on different OPGD boards at the same time on the same OLT.
To be specific, FTTH and other FTTx services such as FTTC cannot run on the same OPGD board at the same time, but FTTC/FTTB, FTTO, and FTTM services can run on the same OPGD board at the same time. FTTH and other FTTx services such as FTTC can run in the same OLT system at the same time.
l The scenarios can be switched by running the network-role command. By default, the OPGD board in the system runs in the access scenario.
The OPGD board supports different functions when running in the access scenario and subtending scenario.
l Functions Supported Only in the Access Scenario l Functions Supported Only in the Subtending Scenario Module
Feature Description 2 P2P Optical Access
l Functions Supported in Both Scenarios