3Com SuperStack II 3C16665A User Manual - Page 4

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Front Panel

6 Optical Fiber Ports

To connect the unit to a fiber optic network you will need optical fiber

cables terminated with ST bayonet type connectors. Take care to keep

the ends of the cables clean. Wipe with a tissue moistened with ethanol

if necessary.

Connect one of the cables to the Rx connector and the other to the Tx

connector of one port on the unit. To tighten the connectors, align the

keyways with the bayonets, push and twist until locked. The other end

of the cables should connect to the opposite ports (Rx to Tx and Tx to

Rx) of a compatible IEEE 802.3 10BaseFL device.

Optical Safety

Under normal viewing conditions there is no eye hazard from

the transmit LED. It is recommended, however, that the LED is

not viewed through any magnifying device whilst it is powered

on. It is advisable that the fiber Tx port and fiber cable ends are

never viewed directly when powered on.

Sécurité optique

Dans les conditions normales de vision, la diode transmission

ne présente pas de risques pour les yeux . Il est toutefois

recommendé de ne pas regarder à travers un dispositif

amplificateur la diode quand elle est sous tension. Il est

conseillé de ne pas regarder directement le port Tx fibre optique

et le cable fibre optique quand ils sont sous tension.

Optische Sicherheit

Unter normalen Umständen geht von der übertragenden LED

keine Gefahr für die Augen aus. Es wird aber empfohlen, die LED

nicht durch Vergrößerungslinsen zu betrachten solange die

Leuchtdiode unter Strom steht. Ebenso ist es ratsam den

Glasfaser Tx Anschluß und die Enden der Glasfaserkabel nicht

direkt zu betrachten solange diese unter Strom stehen.

STATUS LEDs

The STATUS LEDs show the partition state of a port and whether or not

the Optical Idle signal is present on the segment connected to a port.

Top Row of LEDs

Green on

The Optical Idle signal is being received and the segment

attached to the port is functional. If the port does not

transmit/receive, check the Disable On Boot switch, 14 , is

Enabled.

Green off

The Optical Idle signal is not being received.

Make sure the transceiver attached to the DTE is cor-

rectly connected and powered up.

Check that the attached DTE is switched on.

Check that the attached transceiver is not faulty.

Carry out the checks recommended for when a STATUS

LED is red.

Check for no more than 4 repeater stacks in series, and

that cable lengths do not exceed the maximum speci-

fied in the standard for that medium.

Bottom Row of LEDs

Red on

The port is partitioned from the network.

Check the connections and the cable for any breaks in the

segment.

If the cause of the partition is found and corrected, the

segment is reconnected automatically, after the first valid

packet is transmitted to, or received from the segment.

Red off

The port is not partitioned.

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

Hub 10 6 Port Fiber or the device connected to the port is faulty.

Contact your supplier for further advice.

TCVR LED

The TCVR LED lights red if the Transceiver Module port has partitioned.

Refer to section STATUS LEDs for information on what to do if a segment

is partitioned.

A transceiver module port connected to coaxial cable segment

i i i

may partition if the segment is incorrectly terminated.

The Transceiver Module port may partition if the SQE test pulse is

enabled on its transceiver. SQE test should be disabled on transceivers

used to connect 802.3 repeaters to the network.

AUI LED

The AUI LED lights red if the AUI port has partitioned. Refer to

LEDs "

, 2 , for information on what to do if a segment is partitioned.

An AUI port connected to coaxial cable segment may partition

if the segment is incorrectly terminated.

The AUI port may partition if the SQE test pulse is enabled on its

transceiver. SQE test should be disabled on transceivers used to connect

802.3 repeaters to the network.

UNIT LEDs

The UNIT LEDs indicate the position of this unit in the stack, providing a

Management Module or Advanced RMON Module has been fitted to a

unit in the stack. The appropriate UNIT LED will light green; if this unit

has a Management Module (or Advanced RMON Module) fitted, it will

show as unit number 1. If the unit is in a stack which does not contain a

Management Module or Advanced RMON Module, the UNIT LEDs will

not light.

Packet LED

The Packet LED flashes yellow whenever a packet is received on one of

the 6 fiber ports, the AUI port, or the Transceiver Module port.

If this LED does not flash, there are no packets being received by the

unit.

Collision LED

The Collision LED flashes yellow when a packet collision has been

detected on a segment connected to one of the 6 fiber ports, the AUI

port, or the Transceiver Module port.

Under normal 802.3 operation, collisions occur and cause the Collision

LED to flash. The probability of collisions increases during heavy activity

on the network. The Auto Partition/Reconnection function partitions a

segment from the rest of the network if more than 64 consecutive

collisions are detected on that segment.

Power LED

The Power LED lights green to indicate the power supply to the unit is

correct. If it is not lit, and:

None of the ports work

Check the fuse in the IEC socket and the

fuse within the power cable's plug (if fitted).

The AUI and Transceiver

The internal fixed fuse for the power supply

Module ports do not work,

to the AUI and Transceiver Module ports has

but the twisted pair ports

blown. Contact your supplier.

work

All ports function normally The LED has failed. Contact your supplier.

MGMT LED

The MGMT LED indicates the status of the Management Module or

Advanced RMON Module if fitted.

Off

There is no Management Module or Advanced RMON

Module fitted to the Hub 10 6 Port Fiber or the

internal connection to it has been broken.

Green/(Yellow) The Management Module (or Advanced RMON

Module) is fitted and functioning normally.

Green flashing

Management agent software is being downloaded.

Red

There is a fault on the Management Module (or

Advanced RMON Module) or one of the units in the

stack. Check all connections and refer to the

Management Module guide for more information.

" STATUS