3Com 3C16611 - SuperStack II Dual Speed Hub 500 Manuel de l'utilisateur - Page 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
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
i
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).
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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.
4
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 .
5
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.
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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
7
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.
8
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.
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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.
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