Installation2-53170-A2-GB20-20 December 1996Important InstructionsRead and follow all warning notices and instructionsmarked on the E1 DSU/CSU or included in this guide.CAUTIONDisconnect the power cablebefore connecting or removingany data cables at the rear ofthe unit.HANDLING PRECAUTIONSFORSTATIC-SENSITIVE DEVICESThis product is designed to protectsensitive components from damagedue to electrostatic discharge (ESD)during normal operation. Whenperforming installation procedures,however, take proper static controlprecautions to prevent damage toequipment. If you are not sure of theproper static control precautions,contact your nearest sales or servicerepresentative.Optional Power SourcesThe E1 DSU/CSU is typically powered by the acpower module. Use the following procedures only ifyou want to use an optional dc power source.Using the optional dc power cable, the E1 DSU/CSU iscapable of operating on either a +24 Vdc power source,– 48 Vdc single source battery, or –48 Vdc redundantsource batteries (for power backup). To select the power,choose one of the following power supply types.Installing the +24 Vdc Power SupplyTo install the E1 DSU/CSU using a +24 Vdc powersupply, refer to Figure 2-10 and use the followingprocedure.To install the +24 Vdc power supply,1. Connect the green wire to a suitable earth ground.2. Connect the white wire to the +24 Vdc return.3. Connect the orange wire to the +24 Vdc source.4. Cut the black, red and blue wires off at the outerinsulation.5. Plug the power connector into the E1 DSU/CSU.Figure 2-10. +24 Vdc Power Supply Pinouts
