3com 3C16440A, 3C16441A User Manual
SuperStack®3 Baseline Hub 12-Port TP (3C16440A) and 24-Port TP
(3C16441A) User Guide
DUA1644-0AAA03
3C
16441A
SuperStack
®
3
INTRODUCTION
The SuperStack®3 Baseline Hub is a flexible unmanaged Ethernet
repeater which is very easy to use. It can be used in a variety of ways,
from building a small network to expanding a larger, more established
network.
The SuperStack 3 Baseline Hub 12-port TP (3C16440A) has 12 dedicated
shielded twisted pair (TP) ports on the front panel. The SuperStack 3
Baseline Hub 24-port TP (3C16441A) has 24 dedicated shielded twisted
pair (TP) ports on the front panel. The rear panel also has a slot for a
3Com Transceiver Module; if fitted, the Module will operate in addition to
the TP ports. A range of different media Transceiver Modules is available
from 3Com. Contact your supplier for details.
The Baseline Hub comes with:
!
One power cord for use with the Baseline Hub
!
Four standard height and two reduced height self-adhesive rubber
pads
!
One rack mounting kit
!
A card with details of online registration
The Baseline Hub is suitable for office use where it can be free standing or
rack-mounted (in a wiring closet or equipment room). The hub can be
powered either from the AC mains supply, or through an optional 3Com
SuperStack Advanced Redundant Power System (3C16071/A/B). Contact
your supplier for details.
Network Connections
The Baseline Hub can be used stand-alone or linked with other hubs.
Because each Baseline Hub is a single IEEE 802.3 Ethernet repeater hub,
there can be a maximum of four Baseline Hubs between any two pieces
of Data Terminal Equipment (DTE) (workstations or other equipment) on
the same network.
The Baseline Hub is ready to use. You can connect the Hub to any DTE
fitted with a 10BASE-T network adapter or a 10BASE-T transceiver.
Connect one end of the twisted pair cable to the RJ45 port on the unit
and the other end to the RJ45 port on your network adapter or
transceiver. You can attach up to 12 or 24 twisted pair segments to the
front of the unit.
The Baseline Hub can use both shielded 150 Ohm, and unshielded or
shielded 100 Ohm twisted pair cables. To remain within 802.3 10BASE-T
rules, the maximum length of cable between the unit and any DTE should
not be greater than 100m (328ft). Consult your supplier's technical
support department if you need to use twisted pair cables over greater
distances.
You can fit one of the 3Com Transceiver Modules into the slot on the rear
panel to provide an additional, 13th or 25th port.
You can connect the Baseline Hub to any other 10BASE-T hub or unit
®
using port 12 or 24, to form an inter-repeater link. You must switch port
12 or 24 to MDI to bypass the internal cross-over normally implemented
by 10BASE-T unit ports. Refer to “MDI Switch” for information on connecting hubs and switching port 12 or 24 between MDI and MDIX.
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HOW TO USE THE BASELINE HUB
1
1x
13x
7x
19x6x18x
8 9 10
Numbered elements in this diagram refer to numbered sections in the
text. These numbers, in bold, are used as references.
Front Panel
1 12or24RJ4510Base-TPorts
WARNING: RJ-45 Ports. These are shielded RJ-45 data sockets.
They cannot be used as standard traditional telephone sockets,
or to connect the unit to a traditional PBX or public telephone
network. Only connect RJ-45 data connectors, network telephony systems, or network telephones to these sockets.
Either shielded or unshielded data cables with shielded or
unshielded jacks can be connected to these data sockets.
22
4
12
TCVR Collision PowerTraffic
24
flashing green =
59
2
15 19 2316 20
17 2114
Status
green =
off =
6103
18
3
link OK
partition
no link
8
7114
2
12x
MDI
1
MDIX
24
13
75 6
Baseline Hub
3C16641A SuperStack 3
®
11
Set switch to
Unit 1
Unit 2
MDI (in)
AVERTISSEMENT: Points d’accès RJ-45. Ceux-ci sont protégés
par des prises de données. Ils ne peuvent pas être utilisés comme
prises de téléphone conventionnelles standard, ni pour la connection de l’unité à un réseau téléphonique central privé ou public. Raccorder seulement connecteurs de données RJ-45,
systèmes de réseaux de téléphonie ou téléphones de réseaux à
ces prises.
Il est possible de raccorder des câbles protégés ou non protégés
avec des jacks protégés ou non protégés à ces prises de données.
WARNHINWEIS: RJ-45-Porte. Diese Porte sind geschützte Datensteckdosen. Sie dürfen weder wie normale traditionelle Telefonsteckdosen noch für die Verbindung der Einheit mit einem
traditionellem privatem oder öffentlichem Telefonnetzwerk
gebraucht werden. Nur RJ-45-Datenanscluße, Telefonnetzsysteme
or Netztelefone an diese Steckdosen anschließen.
Entweder geschützte oder ungeschützte Buchsen dürfen an diese
Datensteckdosen angeschlossen werden.
Either shielded or unshielded data cables with shielded or unshielded jacks
can be connected to these data sockets.
2MDISwitch
Ports 1 to 11 (12-port hub) and 1 to 23 (24-port hub) are fixed as MDIX
ports so that they can be connected directly to DTE (workstations or other
equipment) which have MDI ports using normal ‘straight through’ TP
cables.
Port 12 (12-port hub) and 24 (24-port hub) are switch selectable using the
MDI Switch. The ports can be MDIX ports (to connect directly to DTE like
the other ports), or MDI ports (to connect to other repeaters using a
normal ‘straight through’ TP cable).
Out In this position you can connect port 12 or 24 to a
workstation or any other DTE using a normal ‘straight
MDIX
MDI
through’ TP cable.
In In this position you can connect port 12 or 24 to any
MDIX port on another 10BASE-T repeater using a normal
‘straight through’ TP cable.
Switch set to MD IX (o u t)
if port 24 used
To connect two Baseline Hubs, connect port 12 or 24 on unit 1 to any
port on unit 2. Ensure that the MDI switch on unit 1 is IN (MDI) and that
ifport12or24isusedonunit2,theMDIswitchisOUT(MDIX).
3 TP Status LEDs
The TP 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
Flashing
green
Off
The Link Pulse signal is being received and the segment attached
to the port is functional.
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.
■
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.
The Link Pulse signal is not being received.
Check that the attached DTE is switched on.
■
■ Check that the attached transceiver is not faulty.
If it is port 12 or 24 or an inter-repeater link, check the setting
■
of the MDI switch.
Carry out the checks recommended for when a Status LED is
■
flashing green.
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
Baseline Hub or the device connected to the port is faulty. Contact your
supplier for further advice.
2
4 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
Flashing green
Off
Transceiver Module fitted correctly and not partitioned.
Transceiver Module partitioned.
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.
5TrafficLED
The Traffic LED flashes green whenever data is received on one of the
twisted pair ports or the Transceiver Module port.
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
recessesofthelowerunit.
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.
7PowerLED
The Power LED indicates a number of conditions:
Green
Off
The unit is powered on and ready for use.
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 System) 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 Modules.
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.
Positioning the Baseline Hub
CAUTION: When installing the Baseline Hub in a stack of different 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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