3Com 3C16671 - SuperStack II Hub 10 User Manual - Page 4

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1
24 RJ45 Ports
WARNING: These are shielded RJ45 data sockets. They can not
be used as telephone sockets. Only connect RJ45 data
connectors to these sockets.
AVERTISSEMENT: Les ports RJ45 sont les prises de courant de
données RJ45 protégées. Ils ne peuvent pas être utilisés comme
prises de courant téléphoniques. Brancher seulement les
connecteurs RJ45 de données à ces prises de courant.
WARNUNG: Hierbei handelt es sich um abgeschirmte RJ45
Datenbuchsen, die nicht als Telefonbuchsen verwendbar sind.
Nur RJ45 Datensteckverbinder an diese Buchsen anschließen.
These are shielded RJ45 data sockets. They can not be used as
telephone sockets. Only connect RJ45 data connectors to these sockets.
Either shielded or unshielded data cables with shielded or unshielded
jacks can be connected to these data sockets.
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
repeater using normal twisted pair cable to form
MDI
an inter-repeater link.
To form an inter-repeater link using two Hub 10 24 Port TPs, 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 port 24 or 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 24 Port TP 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 "
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
Status LEDs for information on what to do if a segment is partitioned.
An AUI port connected to coaxial cable segment may partition
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
Packet LED
The Packet LED flashes yellow whenever a packet is received on one of
the 24 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.
8
Collision LED
The Collision LED flashes yellow when a packet collision has been
detected on a segment connected to one of the 24 twisted pair 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.
9
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
Module ports do not work,
supply to the AUI and Transceiver
but the twisted pair ports
Module ports has blown. Contact your
work
supplier.
All ports function normally
The LED has failed. Contact your supplier.
10
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 24 Port TP 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.