Physical Features 11
(PD) Port powering on the front panel to indicate PoE
operation.
CAUTION: The Switch supports full-duplex autone-
gotiation. If the connected device does not support
autonegotiation, the Switch will operate in
half-duplex mode (even if the attached device is oper
-
ating in full-duplex mode).
In such a configuration, you may notice some degra-
dation of network performance. 3Com recommends
that you use devices that are capable of autonegotia
-
tion (and that you ensure that autonegotiation is
enabled, if it is a configurable option). (see
“Trouble-
shooting” on page 51).
(3) Module Active LEDs
The Module Active LEDs show the status of any SFP
modules that are installed.
(4) Link/Activity LEDs
The Link/Activity LEDs show the link status of ports
and the speed of connected devices.
(5) 10/100/1000BASE-T/SFP Ports
Ports 25 and 26 are combination Gigabit RJ-45 ports
with shared Small Form Factor Pluggable (SFP) trans
-
ceiver slots. If an SFP transceiver (purchased sepa-
rately) is installed in a slot and is active, the associated
RJ-45 port of the same number is disabled.
The 1000BASE-T RJ-45 ports support automatic
MDI/MDI-X operation, so you can use
straight-through or crossover cables for all network
connections to workstations or servers, or to other
switches or hubs.
Status Meaning
Green Fiber SFP is inserted in the slot
Off No fiber SFP is inserted in the slot
Status Meaning
Green The link is operating at 1000 Mbps
Yellow The link is operating at 10 or 100 Mbps
Flashing Green Packets are being received or transmit-
ted on the port at 1000 Mbps
Flashing Yellow Packets are being received or transmit-
ted on the port at 10 or 100 Mbps
Flashing Yellow to
Green
Port disabled or link loopback error
Off The link has not been established, either
nothing is connected to the port, or
there is a problem:
■ Verify that the attached device is
powered on
■ Verify that the cable or fiber is the
correct type and is not faulty
■ For fiber connections, ensure that the
receive (RX) and transmit (TX) cable
connectors are not swapped
If these checks do not identify the cause
of the problem, it may be that the unit
or the device connected to the port is
faulty. Contact your 3Com network sup
-
plier for further advice.
Status Meaning
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