3Com 3C17715, 3C17716 Interconnecting Two Switches, Module Port Restrictions, LED Function Tables

INTERCONNECTING TWO SWITCHES

Interconnecting Two Switches

To interconnect two Switches, you will need the XRN Interconnect Module Kit (part number 3C17715). This kit contains:

„Two XRN Interconnect Modules (3C17716)

„One standard XRN Interconnect Cable (3C17721)

You can interconnect two Switch units that are located in

!separate racks with a 5 m (16.40 ft) long Interconnect cable (3C17722). Contact your network supplier for further information.

CAUTION: It is important that you only plug an XRN

!Interconnect Cable (3C17721 or 3C17722) into the connector on the XRN Interconnect Module (3C17716).

Connecting any other 9-way plug into the connector on the XRN Interconnect Module could result in damage to your hardware.

The end of the Interconnect Cable that you connect to the Switch determines the identity of the Switch. The Switch that has the blue end of the cable connected to it will be Unit 1. The Switch that has the yellow end of the cable connected to it will be Unit 2.

The terms Unit 1 and Unit 2 are used simply to identify

!the Switch units for management purposes only.

Figure 3 Interconnecting Two Switches

Unit 1: Blue End of Cable

CAUTION: 3Com recommends that you do not connect or

!disconnect the Interconnect Cable when the Switches are in use. If you do, the flow of data will be affected and your network configuration settings may change.

LED Function Tables

You can gather information about the status of the Module and its packet activity using the Expansion Module LEDs on the front of the Switch (see Table 1) and the Port LEDs on the front panel of the Module (see Table 2).

Table 1 Switch LED Function Table

Expansion Module Activity LED

Status	Color	Meaning
On	Yellow	Packets are being transmitted or received on the
		Module.
Off	No color	There are no packets being transmitted or received on
		the Module.
Expansion Module Status LED
Status	Color	Meaning
Off	No color	The Module is not installed.
Flashing	Yellow	The Module is installed but is not recognised (faulty or
		unsupported).
On	Yellow	The Module is installed but no link is present.
On	Green	The Module is installed and a link is present.
Unit 1—4 LED
Status	Color	Meaning

90	VSUPPLY-	DATA
	- 240	Hz	A	I

INPUT
V	A
27	12Max

(max)Console
19200,8,1,N	S/N: X
	XXX/7XXXXXXXXX

Unit 1
U	Activity
nit 2
	Status

3	C17716 XRN
		Interconnect
			Module

Unit 2: Yellow End of Cable

	S
90	V-UPPLY DATA
	- 240	Hz	A	I

INPUT
V	A
27	12Max

(max)Console			Unit 1
19200,8,1,N	S/N: X	XXX/7XXXXXXXXX	Unit 2	Activity
				Status

3	C17716 XRN
		Interconnect
			Module

On	Green	Determines the identity of the Switch when intercon-
		nected to another Switch to create an XRN Distrib-
		uted Fabric and that a link is present.
Off	No color	A fault has occurred.

Table 2 Module LED Function Table

Activity LED

To interconnect two Switches:

1Install the Interconnect Modules into the Switch units, as described on page 2.

2Connect the Interconnect Cable to the Interconnect Modules (see Figure 3).

3Power-up the Switch units.

4Check the LEDs on the front of the Switch and on the front panel of the Module to ensure that the Module is operating correctly. Refer to the “LED Function Tables” for more information.

Always secure the Interconnect Cable to the Interconnect

!Modules by tightening its securing screws.

Status	Color	Meaning
On	Yellow	Packets are being transmitted or received on this port.
Off	No color	There are no packets being transmitted or received on
		this port.
Status LED
Status	Color	Meaning
On	Green	A link is present and the port is enabled.
Off	No color	There is no link present.
Unit 1—2 LED
Status	Color	Meaning
On	Green	Determines the identity of the Switch when
		interconnected with another Switch. The LEDs indicate
		‘Unit 1’ and ‘Unit 2’ respectively.

MODULE PORT RESTRICTIONS

When using the Interconnect Module, note the following:

„Only one Interconnect Module may be fitted into the Switch.

„The Interconnect Module is not hot-swappable.

„The Interconnect Module is not hot-insertable.

„The Interconnect Module only operates with the Switch units listed on page 1.

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