3Com SuperStack 3870 User manual

Introducing the Resilient Stacking Cable

The Resilient Stacking Cable enables you to stack together

two switches, up to sixteen rack units apart. You can stack

any combination of 3870 24 and 48 port switches, up to a

maximum of eight units.

The Stacking Cable is 130 cm (51.2 in.) long and marked

with a yellow label for the Up and a blue label for the

Down D-Type connectors.

Only one switch in the stack can operate as the master

switch, all other switches operate in slave mode. If more

than one switch in the stack is selected as the master, or if

no switches are selected, the stack will not operate.

Figure 1 The Resilient Stacking Cable

Installing the Stacking Cable

Connect 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) will

break the flow of data.

Figure 2 Connecting Switches in a Stack

Down Connector (Blue Label)

Up Connector (Yellow Label)

Securing Screws

DOWN

SuperStack®3 Switch 3870 Resilient Stacking Cable

(3C17463)

Installation Guide

DUA1746_3AAA01.fm Page 1 Monday, April 26, 2004 11:43 AM

Table 1 Attaching the Cable Between Two Switches

LEDs

The stack LEDs are located on the front of the Switch as

shown in Figure 3:

Figure 3 Switch Front Panel - Stack LEDs

Table 2 shows how to read the status of the stack according

to the stack LEDs on the front of the Switch.

Table 2 Stack LEDs

any form or by any means or used to make any derivative work (such as translation, transformation, or

adaptation) without permission from 3Com Technologies.

3Com, the 3Com logo and SuperStack are registered trademarks of 3Com Corporation. Unless

otherwise indicated, 3Com registered trademarks are registered in the United States and may or may

not be registered in other countries.

Part No. DUA1746-3AAA01 Published May 2004

Connector Label Color Attach to the:

Yellow Up port in the back panel of the top Switch

Blue Down port in the back panel of the bottom

Switch

SuperStack 3 Switch 3870 24-port

Stack

Master

Module

Activity

21 22 23 24

Power

Fault

Stack Status/

Stack Master LEDs

Color State:

Status

Green The Uplink/Downlink is operating normally.

Yellow One-sided connection (one side of the cable is connected

but the other side is not).

Off No stacking link is present.

Master

Green Master unit - normal stack operation state.

Yellow Slave unit - normal stack operation state.

Yellow flashing The system is in arbitration/election state.

Off The system is not stacked.

DUA1746_3AAA01.fm Page 2 Monday, April 26, 2004 11:43 AM

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