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For The AT- WDRPS- 80 unit can be installed while the multiplexer is powered ON. details on the features and functions of your Allied Telesyn AT-WD1008 chassis and You do not need to power OFF the multiplexer to install the RPS. modules, refer to the following manuals from our web site: . AT-WD1008 Gigabit Ethernet Wavelength Division Multiplexer 1. Loosen the two thumbscrews that secure the blank faceplate over the right- Installation Guide hand redundant power supply expansion slot located on