3Com 12 PORT UNMANAGED ETH/HUB TRANSCEIVER User Manual - Page 3
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Print Page4 Transceiver Module Status LED
If a Twisted Pair or Fiber Transceiver Module has been fitted, the LED
behaves the same as the TP Status LEDs, refer to 3.
For other Transceiver Modules, the LED shows these states:
Green
Transceiver Module fitted correctly and not partitioned.
Flashing green
Transceiver Module partitioned.
Off
Transceiver Module is faulty or fitted incorrectly.
A Transceiver Module port connected to a coaxial cable segment
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 Traffic LED
The Traffic LED flashes green whenever data is received on one of the
twisted pair ports or the Transceiver Module port.
If this LED does not flash, there is no data being received by the unit. If
the unit is receiving data but the LED does not flash, the LED has failed.
Contact your supplier.
6 Collision LED
The Collision LED flashes yellow when a packet collision has been
detected on a segment connected to one of the twisted pair ports or the
Transceiver Module port.
Under normal 802.3 Ethernet 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
32 consecutive collisions are detected on that segment.
If the Collision LED lights for long periods of time, it indicates a high
amount of collisions which can slow your network down. If this happens,
you may need to separate parts of your network with a switch. Contact
your supplier.
7 Power LED
The Power LED indicates a number of conditions:
Green
The unit is powered on and ready for use.
Off
The unit is powered off.
The power cable may be connected incorrectly or the fuse within
the power cord's plug may be faulty (UK models only).
If the unit appears to be operating and the LED is off, contact
your supplier.
Rear Panel Connections
8 Power Supply
The Baseline Hub automatically adjusts to the supply voltage. Only use the
power cord that is supplied with the Baseline Hub, or a power cord of the
same type and rating.
9 Socket for Redundant Power System
Only connect a 3Com SuperStack 3 Advanced RPS (Redundant Power Sys-
tem) to this socket. For details, follow the installation instructions in the
guide accompanying the Redundant Power System.
10 Transceiver Module Slot
A variety of 3Com plug-in Transceiver Modules can be installed in the
Baseline Hub. Transceiver Modules provide direct network connections to
different media. Contact your supplier for information on the latest Mod-
ules.
CAUTION: Do not remove the Transceiver Module blanking plate
while the hub is connected to a power source.
Ensure that SQE test is disabled on the Transceiver Module that you are
using.
To install a Transceiver Module, refer to the guide that accompanies it. If
you subsequently remove the Transceiver Module, you must replace the
blanking plate to aid the circulation of cooling air and prevent the entry
of dust and debris.
11 Self-adhesive Pads
The Baseline Hub is supplied with four standard height and two reduced
height self-adhesive rubber pads. Usage of the feet depends on where the
Baseline Hub is placed:
Use the four standard height pads if the unit is to be placed on a flat
!
surface or stacked with another SuperStack 3 product of the same
dimensions.
Use the two reduced height pads and two of the standard height
!
pads if the unit is to be stacked on a SuperStack 3 unit of different
dimensions — Line up the front of the units, and use the two
standard height pads at the front (to fit the recess of the unit
beneath) and use the two reduced height pads at the back.
Do not apply the pads if you intend to rack mount the hub.
If the hub is to be part of a free standing stack, apply the pads to each
marked corner area on the underside of the hub. Place the hub on top of
the lower unit, ensuring that the pads of the upper unit locate with the
recesses of the lower unit.
Positioning the Baseline Hub
CAUTION: When installing the Baseline Hub in a stack of differ-
ent size units, the Baseline Hub must be installed above any
larger units. Do not have a free standing stack of more than six
units.
When deciding where to position the Baseline Hub ensure:
!
It is accessible and cables can be connected easily.
Cabling is away from:
!
sources of electrical noise such as radios, transmitters and broad-
band amplifiers.
power lines and fluorescent lighting fixtures.
Water or moisture cannot enter the case of the unit.
!
Air flow around the unit and through the vents in the side of the case
!
is not restricted (3Com recommends that you provide a minimum of
25mm (1in.) clearance).
To prolong the operational life of your units:
Never stack units more than six high if free standing, and ensure that
!
cables are supported so that they do not cause the stack to fall over.
!
Do not place objects on top of any unit or stack.
Do not obstruct any vents at the sides of the case.
!
Power Supply
Power problems can be the cause of serious failures and downtime in
your network. Ensure that the power input to your system is clean and
free from sags and surges to avoid unforeseen network outages. 3Com
recommends that you install power conditioning, especially in areas prone
to black outs, power dips and electrical storms.
The unit is intended to be grounded. Ensure it is connected to earth
ground during normal use. Installing proper grounding helps to avoid
damage from lightning and power surges.
Rack Mounting
The Baseline Hub can be mounted in a 19-inch equipment rack. Refer to
"Mounting Kit Instructions".
Power Up
Use the following sequence to power up the Baseline Hub:
Check the network connections and cables.
!
Connect the power supply cable to the appropriate power socket on
!
the rear panel of the unit. Refer to 8 or 9.
Connect the plug to the power supply outlet socket. If you are using
!
a 3Com Redundant Power System, ensure that it is switched on.
When the Baseline Hub is powered on, the Power LED should be lit. If it is
not, refer to 7, "Power LED".
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