3Com 3C16476A User Guide - Page 10

/100/1000BASE-T/SFP Ports, Link/Activity LEDs, with shared Small Form Factor Pluggable SFP trans

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10 CHAPTER 1: INTRODUCING THE BASELINE SWITCH (half-duplex or full-duplex) are automatically determined by the capabilities of the connected device. Each port also supports automatic MDI/MDI-X detection and can be connected to either a 10BASE-T, or a 100BASE-TX device. CAUTION: The Switch supports full-duplex autonegotiation. If the connected device does not support autonegotiation, the Switch will operate in half-duplex mode (even if the attached 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 autonegotiation (and that you ensure that autonegotiation is enabled, if it is a configurable option). (see "Troubleshooting" on page 59). (2) 10/100/1000BASE-T/SFP Ports Ports 49 and 50 are combination Gigabit RJ-45 ports with shared Small Form Factor Pluggable (SFP) transceiver slots. If an SFP transceiver (purchased separately) 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. The two SFP ports support fiber Gigabit Ethernet short-wave (SX) and long-wave (LX) SFP transceivers in any combination. This offers you the flexibility of using SFP transceivers to provide connectivity between the Switch and remote 1000 Mbps workgroups or to create a high-capacity aggregated link backbone connection. SFP ports are numbered 49 and 50 on the Switch. When an SFP port is active, it has priority over the 10/100/1000 port of the same number. The corresponding 10/100/1000 port is disabled when an SFP transceiver is plugged in. (3) Link/Activity LEDs The following tables describe the LEDs visible on the front of the Switch, and how to read their status according to color. Table 4 10BASE-T/100BASE-TX Ports Status Meaning Green Link established, operating at 100 Mbps Yellow Link established, operating at 10 Mbps Flashing Green Packets are being received or transmitted on the port at 100 Mbps

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10
C
HAPTER
1: I
NTRODUCING
THE
B
ASELINE
S
WITCH
(half-duplex or full-duplex) are automatically
determined by the capabilities of the connected
device.
Each port also supports automatic MDI/MDI-X
detection and can be connected to either a 10BASE-T,
or a 100BASE-TX device.
CAUTION:
The Switch supports full-duplex
autonegotiation. If the connected device does not
support autonegotiation, the Switch will operate in
half-duplex mode (even if the attached 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
autonegotiation (and that you ensure that
autonegotiation is enabled, if it is a configurable
option). (see
“
Troubleshooting
”
on
page 59
).
(2) 10/100/1000BASE-T/SFP Ports
Ports 49 and 50 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.
The two SFP ports support fiber Gigabit Ethernet
short-wave (SX) and long-wave (LX) SFP transceivers
in any combination. This offers you the flexibility of
using SFP transceivers to provide connectivity
between the Switch and remote 1000 Mbps
workgroups or to create a high-capacity aggregated
link backbone connection.
SFP ports are numbered 49 and 50 on the Switch.
When an SFP port is active, it has priority over the
10/100/1000 port of the same number. The
corresponding 10/100/1000 port is disabled when an
SFP transceiver is plugged in.
(3) Link/Activity LEDs
The following tables describe the LEDs visible on the
front of the Switch, and how to read their status
according to color.
Table 4
10BASE-T/100BASE-TX Ports
Status
Meaning
Green
Link established, operating at 100 Mbps
Yellow
Link established, operating at 10 Mbps
Flashing Green
Packets are being received or
transmitted on the port at 100 Mbps