3Com 3C16794-ME - OfficeConnect Switch 8 Spécifications - Page 2
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BEFORE YOU INSTALL YOUR SWITCH
Unit Connections
To connect OfficeConnect units (such as Hubs and other Switches) to
your Switch, you need:
●
One suitable Twisted Pair (TP) cable for each unit.
Workstation Connections
To connect workstations or other equipment (such as servers) directly
to your Switch, you need:
1. One 10BASE-T, 100BASE-TX or 10/100BASE-TX adapter card for
each workstation. 3Com produce a range of easy to install network
adapters.
2. An operating system (for example, NetWare or Windows
95/98/Me/2000) with network support configured, running on your
workstations.
3. One suitable Twisted Pair cable for each workstation.
Figure 2 Workstation connections
1
3
4
HOW YOUR SWITCH CAN BE USED
Switchin
Switching
When a network of repeater hubs is in operation, any information
that is sent by the workstations is passed around the whole network
(regardless of the destination of the information). This can result in a
lot of unnecessary traffic that can slow the network down. The Switch
solves this problem because it 'listens' to the network and automat-
ically learns what workstations can be reached through its ports. It
can then selectively pass on any information by transmitting the traffic
from the relevant port only (instead of all ports like a repeater hub).
This operation is called 'switching'.
The Switch effectively divides up your network, localizing the network
traffic and passing on traffic as necessary. If you have workstations
that communicate frequently in the same part of the network, traffic
between them is not passed on unnecessarily to the remainder of the
network, thereby reducing the load. If you have any high
performance workstations that require a lot of bandwidth, connect
them directly to the Switch.
Connecting 10BASE-T and 100BASE-TX Networks
The 10/100 ports can each be connected to either a 10BASE-T or
100BASE-TX network. If you have both types of network, you can join
them together using the Switch allowing all your workstations to
communicate. Alternatively, if you use 10BASE-T and want to improve
network performance by introducing 100BASE-TX technology, the
Switch protects the investment in your existing workstations because
it maintains 10BASE-T connections to them.
3
CONNECTING WORKSTATIONS AND OTHER EQUIPMENT TO YOUR SWITCH
Twisted Pair (TP) Cables
Cables can be shielded (screened) or unshielded; 3Com recommends that
you use shielded cable. Cables used for 100BASE-TX connections must be
data grade (Category 5). The maximum length you can use is 100m
(328ft).
Twisted Pair (TP) cables are very easy to use. To connect a TP cable, simply
slot the connector into the relevant RJ-45 port. When the connector is
fully in, its latch locks it into place. To disconnect the cable, push the
connector's latch in and remove it.
When one end of a TP cable is connected to the Switch and the other
end to the network interface card of a workstation the units will
'autonegotiate' to determine the fastest possible link speed between
them. This may take a few seconds and the outcome will be reflected in
the LEDs on the front of the Switch.
The Switch detects all port connections, so you can start using your
network immediately. If you need more ports, simply add another
OfficeConnect unit.
If the equipment connected to the Switch does not support
autonegotiation or if it has been disabled, it must be configured to
operate in half duplex mode
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5
PROBLEM SOLVING
The Switch has been designed to aid you when detecting and solving
possible problems with your network. These problems are rarely
serious; the cause is usually a disconnected or damaged cable, or
incorrect configuration. If this section does not solve your problem,
contact your supplier for information on what to do next.
Perform these actions first:
●
Ensure all network equipment is powered on.
●
Power each piece of network equipment off, wait about 5 seconds
and then power each one on.
CAUTION: Do not power the Switch off and on quickly. Wait
about five seconds between power cycles.
Check the following symptoms and solutions:
Power LED not lit. Check your power adapter connection. If there is
still no power, you may have a faulty power adapter which needs
replacing with another OfficeConnect power adapter. Do not use
any other power adapter with the Switch.
Port Status LED not lit for a port that has a TP cable connected.
After connection it may take several seconds for the port status LED's
to illuminate. The port status LED should turn Green or Yellow for
each port that is connected. Please refer to 'About Your Switch' for a
full description of the LEDs.
lf the Port Status LED has not lit after several seconds ensure the
connected device is powered, the TP cable is not damaged and that it
is correctly inserted at both ends.
Also check whether the correct cable is being used (i.e. straight-
through or crossover), if the uplink port is being used, and whether
the Uplink/Normal Switch is in the correct position.
Expanding Your Network
You can increase the number of workstations that can connect to your
network by adding OfficeConnect Hubs and Switches. You can connect
either a 10BASE-T or a 100BASE-TX OfficeConnect unit to each port of
the Switch. Use the following method for each unit:
1. Connect the Uplink/Normal port of the unit to any of the
Switch's ports (as shown in Figure 3). If using the highest
number port on the Switch (port 5 on Switch 5, port 8 on
Switch 8), set its Uplink/Normal switch to Normal (out).
2. Set the Uplink/Normal switch on the other unit to
Uplink (in).
If you are connecting your switch to a unit with automatic
MDI / MDIX functionality there is no need to follow the steps
described above. The connection will happen automatically.
Checking Unit Connections
When you have connected all your units, power on the units
and the Switch. The Port Status LEDs for the ports you have
used on both the units and the Switch should be on. If they
are not, check your connections and the settings of the
Uplink/Normal switches.
Spot Checks
At frequent intervals, visually check that:
●
Case vents are not obstructed.
●
Cabling is secure and not pulled taut.
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DIMENSIONS AND STANDARDS
Dimensions and Operating Conditions
Standards
EMC:
EN 55022 Class B
EN 55024
Functional:
ISO 8802/3
IEEE 802.3, 802.3u
FCC Part 15 Class B*
ICES-003 Class B
Safety:
UL 1950, EN 60950
CSA 22.2 #950,
VCCI Class B
CNS 13438 Class A
IEC60950
Environmental:
EN 60068 (IEC 68)
* Refer to Regulatory Notices section in the Support and Safety Information sheet
Switch 5 480g (1.1 lb)
Switch 8 535g (1.3 lb)
OfficeConnect
Switch
Figure 3 Correct Connections for an OfficeConnect Switch
3Com Corporation, Corporate Headquarters, 5400 Bayfront Plaza, Santa Clara, CA 95052-8145
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