numbered elements in this diagram refer to numbered sections in the text. a 24-port unit is shown.
front panel
1 24 rj-45 10/100 ports and 1 rj-45 1000 port
ATTENTION：1 rj-45 ports. these are shielded rj-45 data sockets. they cannot be used as telephone sockets. only connect rj-45 data connectors to these sockets. either shielded or unshielded data cables with shielded or unshielded jacks can be connected to these data sockets.
2 les ports rj-45. il s'agit de prises femelles blindées de données rj-45. vous ne pouvez pas les utiliser comme prise de téléphone. branchez uniquement des connecteurs de données rj-45 sur ces prises femelles. les cables de données blindés ou non blindés, avec les jacks blindés ou non blindés, l'un ou l'autre, peuvent être branchés à ces prises de courant de données.
3 rj-45-anschlüsse. dies sind abgeschirmte rj-45-datenbuchsen. sie konnen nicht als telefon anschluβbuchsen verwendet werden. an diesen buchsen dürfen nur rj-45-datenstecker angeschlossen werden. diese datenstecker konnen entweder mit abgeschirmten oder unabgeschirmten datenkabeln mit abgeschirmten oder unabgeschirmten klinkensteckern verbunden werden.
10base-t/100base-tx ports
the baseline 10/100 switch has 12 (3c16464b) or 24 (3c16465b) 10/100mbps auto-negotiating ports.
ports 1-11 (3c16464b) or 1-23 (3c16465b) are mdix ports. each can be connected to a device with an mdi port (such as a workstation) using a normal 'straight through' tp (twisted pair) cable. alternatively, you can connect to a device with mdix ports using 'cross-over' tp cable.
port 12 (3c16464b) or 24 (3c16465b) is 'switch selectable' mdi/mdix using the mdi switch, as described in 2. using this port, you can connect to any other device without the need for 'cross-over' cable.
to connect a device to the baseline 10/100 switch, use category 5 unshielded or shielded (screened) 100 ohm tp cable (or category 3 cable for a 10mbps connection). the maximum length of cable for each connection is 100m (328ft). connect one end of the cable to an rj-45 port on the baseline 10/100 switch, and the other end to the appropriate rj-45 port on the connecting device.
each port on the baseline 10/100 switch is auto-negotiating: its speed and duplex mode (half duplex or full duplex) are automatically determined by the capabilities of the connected device. each port can be connected to either a 10base-t or a 100base-tx device.
ATTENTION：1 if you connect two baseline 10/100 switch units together, the link between them operates at 100mbps full duplex. you must use category 5 cable when connecting the units.
2 the baseline 10/100 switch supports full duplex auto-negotiation. if the connected device does not support auto-negotiation, the switch will operate in half duplex mode (even if the device is operating in full duplex mode). in such a configuration, you may notice some degradation of network performance. 3com recommends that you use devices that are capable of auto-negotiation (and that you ensure that auto-negotiation is enabled, if it is a configurable option).
to connect the baseline 10/100 switch to a superstack 3 hub using a normal 'straight through' cable, connect any port on the baseline 10/100 switch to the mdi/mdix port on the hub, as shown below. ensure that the mdi switch on the hub is in (mdi).
an alternative method of connecting the baseline 10/100 switch to a hub using a normal 'straight through' cable is to connect any mdix port on the hub to the mdi/mdix port on the baseline 10/100 switch, ensuring that its mdi switch is set to in (mdi).
you can use 'cross-over' tp cable to connect any mdix port on the baseline 10/100 switch to any mdix port on a hub.
2 mdi switch
this switch affects port 12 (3c16364b) or port 24 (3c16465b):
3 display function switch
this switch affects the status leds described in 4 and 5.
4 activity/duplex status leds
the first (top) and third row of leds, which are colored yellow, show the activity or duplex status of the related ports:
when the display function switch is out (its normal position), these leds show the activity of each port. the led flashes when packets are received or transmitted on the port.
when the display function switch is pressed in, these leds show the duplex status of each port:
on the port is operating in full duplex mode.
off ports 1 to 24: if the link is established, the port is operating in half duplex mode.
5 link/speed status leds
the second and fourth (bottom) row of status leds, which are colored green, show the link or speed status of the related ports:
when the display function switch is out (its normal position), these leds show the link status of each port:
on the link has been established and the segment attached to the
port is functional.
off the link has not been established. either nothing is connected
to the port, or there is a problem:
check that the attached device is powered on.
check that the cable is the correct type and is not faulty.
if the led is off for port 12 (3c16464b) or 24 (3c16465b),
check the setting of the mdi switch. refer to 2. try toggling the
mdi switch.
if the port is connected to another unit's mdi/mdix port, check
the other unit's mdi switch position.
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.
when the display function switch is pressed in, these leds show the speed status of each port:
on the link is operating at 100mbps.
off if the link is present, it is operating at 10mbps.
6 power/self test led
the power/self test led shows a number of conditions:
green the unit is powered on and ready for use.
flashing the unit is performing its power up procedure. if the led is still
green flashing green 1 minute after power up, there is a fault. contact
your supplier.
yellow the unit has failed. power off the unit, wait five seconds and
power on the unit. contact your supplier if the led continues
to light yellow.
off the unit is not receiving power:
check the power cord is connected correctly.
if the unit still does not operate, contact your supplier.
rear panel connections
7 power supply
the baseline 10/100 switch automatically adjusts to the supply voltage. only use the power cord that is supplied with the baseline 10/100 switch.
8 socket for redundant power system (rps)
only connect a 3com superstack 3 advanced rps (3c16070, 3c16071, 3c16071a or 3c16071b) to this socket. an appropriate power module and cable is required. the connector on the baseline 10/100 switch is a type 2 socket. for details, follow the installation instructions in the guides that accompany the advanced rps and the power module.
ATTENTION：when connecting an rps power module cable to the unit, take off the protective cover by removing the fixings with a suitable tool. keep the cover and the fixings in a safe place. if you remove the rps power module able at any time, you must replace the protective cover.
9 self-adhesive pads
the unit is supplied with four self-adhesive rubber pads.
ATTENTION：you do not need to apply the pads if you intend to rack mount the unit.
if the unit is to be part of a free standing stack, apply the pads to each marked corner area on the underside of the unit. place the unit on top of the lower unit, ensuring that the pads locate with the recesses of the lower unit.
positioning the baseline 10/100 switch
ATTENTION：if installing the baseline 10/100 switch in a stack of different size superstack 3 units, the smaller units must be installed above the larger ones. do not have a free standing stack of more than six units.
when deciding where to position the baseline 10/100 switch ensure:
it is accessible and cables can be connected easily.
cabling is away from sources of electrical noise such as radios, transmitters and broadband amplifiers, and away from 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 recommend 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.
rack mounting
the baseline 10/100 switch can be mounted in a 19-inch equipment rack using the mounting kit. refer to "mounting kit instructions" on page 5.
power up
use the following sequence to power up the baseline 10/100 switch :
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 7 or 8.
connect the plug to the power supply outlet socket and switch on the power supply at the socket. if you are using the advanced redundant power system, ensure it is powered on.
when the switch is powered on, the power/self test led should first flash green, then stay lit. if it does not, refer to 6.
spot checks
at frequent intervals you should visually check the baseline 10/100 switch. regular checks can give you an early warning of a possible failure; any problems can then be attended to when there will be least effect on users. check the following:
cabling check that all external cabling connections are secure
and that no cables are pulled taut.
cooling fans where possible, check that the cooling fans are operating
by listening to the unit. the fans are fitted near to
the front right hand side of the unit (when viewed from
the front).
if you experience any problems operating the baseline 10/100 switch, refer to "problem solving" on page 5.