SmartSTACK FAST ETHERNET SWITCHSINGLE DC REDUNDANT POWERSUPPLY UNITCabletron System's ELS-S1DC Redundant PowerSupply Unit (RPU) can supply 150 Watts of backuppower to a single Cabletron System's SmartSTACKELS100-S24TX2M switch in the event of an AC loss orfailure of an internal power supply. Please check withCabletron Systems for information on the devicessupported by this RPU.Features and Benefits• Supports one Cabletron System's SmartSTACKELS100-S24TX2M switch• AC line cord can draw power from a different supplycircuit• DC line cord provides backup power to the attacheddeviceFront and Rear PanelsA Power indicator is located on the RPU’s front panel.While the AC supply and DC backup receptacles arelocated on the RPU’s rear panel.The Power LED can be used to verify if this unit isfunctioning properly. The following table details theindicator function provided by the ELS-S1DC:Status LEDsLED Condition StatusPower On Unit is receiving power.INSTALLING THE RPUThe RPU may be placed on a desktop or mounted in arack.Warning: DO NOT install this RPU anywhere it maycome in contact with water (i.e. floor) Cabletronrecommends that this RPU be installed in a networkrack.Equipment ChecklistAfter unpacking the RPU, check the contents of the boxto be sure you’ve received the following items:• Redundant Power Supply Unit — provides backuppower to one Cabletron System's device• One AC Supply Power Cord — US, ContinentalEurope or UK• One DC Backup Power Cord — with D-subconnectors on both ends• Four Self-adhesive Rubber Feet• Rack Mounting Kit — brackets and screws• Star-head screwdriver• Quick Installation GuideDesktop or Rack MountingYou can set the RPU on a desktop or flat surface neara separate AC power source and close to the device towhich it is to supply power. Make sure that themounting surface can safely support the RPU deviceand that there is adequate space around the RPU forventilation and cooling.The ELS-S1DC RPU ships with four (4) rubber feet.Stick the self-adhesive rubber foot pads on each of thefour concave spaces located on the bottom of the RPU.The rubber foot pads cushion the RPU against shock/vibrations and provide space between each device forventilation.To mount the RPU in a standard EIA 19-inch rack, usethe brackets and screws supplied with the RPU. Use across-head screwdriver to attach the brackets to theside of the RPU. Position the RPU in the rack by liningup the holes in the brackets with the appropriate holeson the rack. And then use the supplied screws to mountthe RPU in the rack. (Leave about two inches of spaceat the rear of the RPU to ensure adequate ventilation.)Making ConnectionsCaution: DO NOT connect the RPU to an AC powersource until the DC power cord has been connected tothe other device (hub or switch).1. Connect one end of the AC cord to the ACreceptacle on the supported device (hub or switch),and the other end to a grounded power outlet.2. Use the provided star-head screwdriver to loosenthe faceplate screws on the RPU’s outputreceptacle and remove the faceplates from both theRPU and the supported device (hub or switch).3. Connect one end of the DC cord to the redundantpower receptacle on the other device (hub orswitch), and the other end to the output receptacleon the RPU.4. Connect one end of the AC cord to the ACreceptacle on the RPU, and the other end to agrounded power outlet. The Power LED on theRPU should light up.TROUBLESHOOTINGIf you experience any problems with the RPU, checkthe following items before contacting CabletronSystems Technical Support:• Ensure that the RPU in the stack is powered up.• Ensure that the devices attached to the stack arepowered up and operating correctly.• Check the connectors on both ends of the powercable to be sure they are properly engaged. Tightenthe screws on the cable connectors to ensure agood connection.