3Com 3C16610 - Superstack II Dual Speed HUB 500 Panduan Pengguna - Halaman 3

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MDI Switch

Ports 1–11 or 23 are fixed as MDIX ports so that they can be connected

directly to devices which have MDI ports using normal 'straight through'

TP cables.

Port 12 (3C16610) or 24 (3C16611) is 'switch selectable' using the MDI

Switch. The port can be an MDIX port (to connect directly to devices like

the other ports), or an MDI port (to connect to other units using a

normal 'straight through' TP cable).

Out

In this position you can connect port 12 or 24 to a

workstation or any other device using a normal

'straight through' TP cable.

MDIX

In this position you can connect port 12 or 24 to

any MDIX port on a 10BASE-T or 100BASE-TX unit

MDI

using a normal 'straight through' TP cable.

If you want to connect Dual Speed Hub 500 units or stack

together, it is recommended that you use the Cascade Cables or

a Distance Extender Module, rather than using the TP ports

(and the MDI switch).

To connect a Dual Speed Hub 500 unit to another 10Mbps or 100Mbps

unit or stack, connect an MDIX port on the unit or stack to port 12 or 24

on the Dual Speed Hub 500, as shown below. Ensure that the MDI

switch on the Dual Speed Hub 500 is IN (MDI). If an MDI/MDIX port is

used on the unit or stack, ensure that the MDI switch for that port is

OUT (MDIX).

Status LEDs

The Status LEDs show the state of a port and whether or not the Link

Pulse signal is present on the segment connected to a port:

Green

A 100Mbps Link Pulse signal is being received and the

100BASE-TX segment attached to the port is functional.

Yellow

A 10Mbps Link Pulse signal is being received and the

10BASE-T segment attached to the port is functional.

Flashing

The port has partitioned due to a network loop, or has

been disabled by management. To remove the network

loop, examine your connections and ensure that each

piece of equipment is connected to your network by one

connection.

You can have multiple connections for equipment (for

resilience) but you must use resilient links to control them;

refer to the documentation that accompanies the

Management Module.

Off

The Link Pulse signal is not being received. Either you have

nothing connected to the port, or there is a problem:

Check that the attached device is powered on.

Check that the attached transceiver is not faulty.

Check that the cable is the correct type and is not

faulty.

If the LED is off for port 12 or 24, check the setting of the

MDI switch, refer to 2 .

If you have connected stacks or different units together,

check that your configuration conforms to the network

configuration rules for 10BASE-T and 100BASE-TX.

If these checks do not identify the cause of a problem, it may be that the

unit or the device connected to the port is faulty. Contact your supplier

for further advice.

Segment LEDs

The Segment LEDs indicate 10Mbps and 100Mbps activity:

Flashing

Packets are being received or transmitted.

green

Flashing

Collisions are occuring on the segment. A low level of

yellow

collisions is a part of normal Ethernet and Fast Ethernet

operation. Excessive collisions may indicate a network

problem.

Off

No packets are being received or transmitted on the

segment .

Power/Self test LED

The Power/Self test LED indicates a number of conditions:

Green

The unit is powered on and ready for use.

Flashing

The unit is performing a management software upgrade

green

(refer to the user guide that accompanies the

Management Module), or is performing its self test after

being powered on.

Yellow

The unit has failed its self test. Power off the unit, wait five

seconds and power on the unit. Contact your supplier if

the LED continues to light yellow.

Flashing

There is a fault on the cascade. Check the status of the

yellow

Segment LEDs; refer to 4 .

Off

The unit is powered off or the LED has failed .

If the power cable is connected up correctly, there may be

a problem with the fuse within the power cord's plug.

If the unit is operating and the LED has failed, contact your

supplier.

Mgmt/Attn LED

The Mgmt/Attn LED indicates a number of conditions:

Green

A Management Module is installed in the unit .

Flashing

The user's attention is being drawn to the unit. You can

green

use management to make this LED flash; refer to the user

guide that accompanies the Management Module.

Off

A Management Module is not installed in the unit.

Rear Panel Connections

Power Supply

The Dual Speed Hub 500 automatically adjusts to the supply voltage.

Only use the power cord that is supplied with the Dual Speed Hub 500,

or a power cord of the same type.

Type 2 RPS Connector

Only connect a 3Com SuperStack II Advanced Redundant Power System

(3C16070) to this socket. An appropriate power module and cable is

required. For details, follow the installation instructions in the guide that

accompany the Advanced Redundant Power System and the power

module.

Two Transceiver Module Slots

A variety of 3Com modules and transceiver modules can be installed in

the Dual Speed Hub 500, including the Management Module; refer to

the " Products " section in this guide.

WARNING: Disconnect the unit from both the power supply

and the network before installing or removing the module.

AVERTISSEMENT: Débranchez le groupe de l'alimentation

électrique et du réseau avant d'installer ou de déposer le

module.

WARNUNG: Vor dem Installieren bzw. Ausbauen des Moduls

muß der Netzstecker des Geräts abgezogen und die Verbindung

zum Netzwerk unterbrochen werden.

When using transceiver modules with this unit, they will only conform to

EMC Class A requirements.