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Solution 2: Point-to-Multipoint Network Construction

1. Chain Network structure

1.1 Chain mode point-to-multipoint structure

This solution is aimed at transmitting signals from one central station to several subsidiary stations. The central station uses C5000 series system chassis transmit signals to subsidiary stations through COM ports. Each subsidiary station adopts a passive OADM unit to download and upload local data, the users’ ends ONU (CWDM Media Converter) will convert data into local signals, and then through RJ45 port output them to users’ end switch or direct terminal.

1.2 CWDM—PON Structure


The advantages of this program are easy for installation and maintenance. Several data gather in C5000 series chassis, then output from COM to user’s end CWDM passive ODU/OMU; after demultiplexing, signals are transmitted to each ONU. CWDM passive OMU/ODU place conveniently, they are adapted to block’s broad band and multi-services （C5000 series chassis see above）

2. Products specification

2.1 OADM

OADM（Optical Add and Drop Multiplexer）, in cooperating with CWDM chassis, download and upload local signals.
Ports:
COM port: public port, receives upper signals, connect to chassis.
Local service ports: for downloading or uploading local signals, connect to users’ ends ONU (CWDM Media Converters).
Upgrade port: for receiving signal nether, directly connect to COM ports of nether OADM. 

2.2 CWDM passive ODU/OMU

Ports for different wavelengths

CWDM passive OMU/ODU multiplexes/ demultiplexes different wavelength signals, main ports are COM port and relevant wavelength fiber port. COM port receives multiple signals from central side, and then the ODU/OMU demultiplexes signals to different wavelength fiber port and transmits to relevant user’s end ONU (CWDM media converter).

Solution 3: Ring mode network

This solution has a central station (station A), transmitting multiple service signals in two opposite directions to B, C, D, E subsidiary stations, each one can upload/download relevant wavelength (1270~1610nm) service signals simultaneous, the whole ring could support net management too. It not only saves up fibers, but also transmits service signals in both main and backup fiber to ensure the stability of the communication, is a considerable choice of MANs construction solution.