3Com 3C16672A Podręcznik użytkownika - Strona 4
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Front Panel
1
24 Telco Ports
A range of Telco connectors can be used with the Hub 10 Telco. Refer to
" Introduction "
for more information.
CAUTION: Do not over-tighten the screws on the Telco
connectors.
2
MDI Switch
The Media Dependent Interface (MDI) switch controls the operation of
port 24. The switch is recessed and can be operated using a ball-point
pen or similar instrument.
Out In this position you can connect port 24 to a
workstation or any other DTE.
MDIX
In
In this position you can connect port 24 to any
internal cross-over (X) port on another 10Base-T
MDI
repeater using normal twisted pair cable to form an
inter-repeater link.
To form an inter-repeater link using two Hub 10 Telcos, connect port 24
on unit 1 to any port on unit 2. Ensure that the MDI switch on unit 1 is
IN (MDI) and that if port 24 is used on unit 2, the MDI switch is OUT
(MDIX).
3
STATUS LEDs
The STATUS LEDs show the partition state of a port and whether or not
the Link Pulse signal is present on the segment connected to a port
Green The Link Pulse 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, 15, is
Enabled.
Red
The Link Pulse signal is being received and the port is
partitioned from the network.
Check the connections and the cable for any breaks in the
segment.
Make sure the transceiver attached to the DTE is correctly
connected and powered up.
Check for illegal 802.3 configurations, in particular, loops.
Check that the Disable On Boot switch, 15 , is set for units
with standby ports in resilient links.
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.
Off
The Link Pulse signal is not being received.
Check that the attached DTE is switched on.
Check that the Link Pulse signal has not been disabled by
management software.
Check that the attached transceiver is not faulty.
If it is an inter-repeater link, check the setting of the MDI
switch.
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 specified in the
standard for that medium.
If these checks do not identify the cause of a problem, it may be that the
Hub 10 Telco or the device connected to the port is faulty. Contact your
supplier for further advice.
4
TCVR LED
The TCVR LED lights red if the Transceiver Module port has partitioned.
Refer to
" STATUS LEDs "
, 3 , for information on what to do if a segment is
partitioned.
A transceiver module port connected to coaxial cable segment
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.
5
AUI LED
The AUI LED lights red if the AUI port has partitioned. Refer to
LEDs "
, 3 , for information on what to do if a segment is partitioned.
An AUI port connected to coaxial cable segment may partition
i i i
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.
6
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.
7
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
The AUI and Transceiver
Module ports do not work,
but the twisted pair ports
work
All ports function normally
8
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 Telco 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.
9
Packet LED
The Packet LED flashes yellow whenever a packet is received on one of
the 12 twisted pair ports, the AUI port, or the Transceiver Module port.
If this LED does not flash, there are no packets being received by the
unit.
10
Collision LED
The Collision LED flashes yellow when a packet collision has been
detected on a segment connected to one of the 24 Telco 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.
Check the fuse in the IEC socket and the
fuse within the power cable's plug (if
fitted).
The internal fixed fuse for the power
supply to the AUI and Transceiver
Module ports has blown. Contact your
supplier.
The LED has failed. Contact your supplier.
" STATUS