Expansion Link Controller Module Set
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Features
- Designed Specifically for the DNX-88
- Connects to the XCC Rear Interface Module
- Each XLC Terminates Two X-Link Interfaces that Provide the Connection to the XCCs
Introduction
The Expansion Link Controller (XLC) Module Set is specifically designed for the DNX-88. The DNX-88 expansion node Nests 2 through 8 use an XLC module to connect to the XCC rear interface module located in the Node Manager Nest 1. Each XLC module terminates two X-link interfaces that provide the connection to the XCCs. Data from the links is mapped directly onto the local DNX midplane, where the data is then connected to the service-bearing modules (e.g., OT1/E1, STS-1, etc.).
The XLC performs other functions. It adapts supervisory messages from the X-link format to the DNX midplane format. These messages (configuration, statistic, and alarm information relevant to the local nest) are then forwarded to the System Manager Controller II for further processing. The XLC also extracts timing information embedded within the X-link and distributes it to other modules within the local nest.
In order to preserve application slots for service bearing interfaces, the XLC utilizes the existing DNX Octal T1/E1 rear interface module. The slot now serves a dual function -- forwarding backplane traffic to the XCC and delivering additional network interfaces.
The XLC supports optional 1+1 redundancy.