3Com SuperStack 3870 Installation Manual

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Introducing the Resilient Stacking CableThe Resilient Stacking Cable enables you to stack togethertwo switches, up to sixteen rack units apart. You can stackany combination of 3870 24 and 48 port switches, up to amaximum of eight units.The Stacking Cable is 130 cm (51.2 in.) long and markedwith a yellow label for the Up and a blue label for theDown D-Type connectors.Only one switch in the stack can operate as the masterswitch, all other switches operate in slave mode. If morethan one switch in the stack is selected as the master, or ifno switches are selected, the stack will not operate.Figure 1 The Resilient Stacking CableInstalling the Stacking CableConnect the Stacking Cable as shown in Figure 2.Always secure the Stacking Cable to the device by tighten-ing its securing screws.CAUTION: If a Resilient Stacking Cable is not fitted then dis-connecting a Stacking Cable (when the stack is in use) willbreak the flow of data.Figure 2 Connecting Switches in a StackDown Connector (Blue Label)Up Connector (Yellow Label)Securing Screws!!UPDOWNUPDOWNUPDOWNUPDOWNSuperStack ® 3 Switch 3870 Resilient Stacking Cable(3C17463)Installation Guide

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