Scheme Overview
This scheme is designed for the chain cascading transmission scenario from the central equipment room to multiple pole-mounted sites. Leveraging CWDM/DWDM wavelength division multiplexing technology, it enables multi-site and multi-service signal transmission over a single fiber or a pair of fibers through the coordinated deployment of passive multiplexer/demultiplexer devices, optical transceivers and pole-mounted OADMs. It solves the pain points of insufficient fiber resources, complicated outdoor deployment and high expansion costs, and is applicable to scenarios such as security monitoring, campus interconnection and power communication.
Core Architecture and Key Products
Networking Architecture
A chain cascading (daisy-chain) topology is adopted:
- A 1U rack-mounted CWDM/DWDM multiplexer/demultiplexer (MUX/DEMUX) is deployed in the central equipment room to combine and split signals from all sites.
- The backbone optical fiber runs through the pole-mounted sites. Each site is equipped with a pole-mounted outdoor OADM device, which performs add/drop of local service signals while transparently transmitting signals of other wavelengths.
- Service equipment at each site connects to the OADM via CWDM/DWDM optical transceivers (1.25G/10G), forming a backhaul link of "central equipment room → multiple sites → central equipment room".
Positioning of Key Products
Positioning of Key Products
| Product |
Core Function |
Deployment Location |
| CWDM/DWDM Multiplexer/Demultiplexer (MUX/DEMUX)Combines and splits multi-wavelength signals to support multi-wavelength |
Combines and splits multi-wavelength signals to support multi-wavelength transmission over a single fiber |
Central equipment room (1U rack-mounted form factor) |
| CWDM/DWDM Optical Transceiver (1.25G/10G) |
Performs optical-electrical conversion of service signals and wavelength matching, assigning an independent wavelength to each site |
Service equipment side at each site + central equipment room side |
| Pole-Mounted OADM Device |
Selectively adds/drops signals of the local site’s wavelength and passes through other signals, enabling chain cascading networking |
Outdoor pole-mounted sites |
Core Advantages of the Scheme
- Fiber resource saving: With the chain cascading mode, only 1 fiber core or 1 pair of backbone fibers can support service backhaul for multiple sites. Compared with point-to-point networking, fiber usage is reduced by more than 80%.
- Strong environmental adaptability: The OADM adopts a pole-mounted design with IP65 ingress protection, supports wide-temperature operation, and is suitable for harsh outdoor environments such as utility poles and power towers.
- Isolated multi-service bearing: Supports both single-fiber and dual-fiber transmission. Different wavelengths can carry video, data, voice and other services independently without mutual interference.
- Easy expansion and operation & maintenance: Adding a new site only requires deploying an OADM and matching wavelength optical transceivers, with no need for rewiring. Passive devices require no routine maintenance.
Typical Application Scenarios
- Centralized backhaul of urban or campus security monitoring video signals
- Chain service backhaul for power towers and communication base stations
- Chain interconnection of multiple buildings in industrial parks or campuses
