Allied Telesis WebSmart AT-FS750/24POE, Руководство по установке

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Chapter 1: Overview
20
Ports
The AT-FS750/24POE Fast Ethernet WebSmart Switch features 24
twisted pair ports and two uplink combo ports. See the following sections
for more information:
ˆ
“Twisted Pair Ports”
ˆ
“Uplink Combo Ports”
Twisted Pair
Ports
The ports on the AT-FS750/24POE Fast Ethernet WebSmart Switch are
are capable of 10 megabits per second (Mbps) and 100 Mbps speeds and
are 10Base-T and 100Base-TX compliant.The twisted pair ports feature 8-
pin RJ-45 connectors. (For the port pinouts, refer to “Connectors and Port
Pinouts” on page 57.)
The ports are IEEE 802.3u Auto-Negotiation compliant. With Auto-
Negotiation, the switch automatically matches the highest possible
common speed between each switch port and each end node. For
example, if an end node is capable of only 10 Mbps, the switch sets the
port connected to the end node to 10 Mbps.
Each twisted pair port on the switch can operate in either half- or full-
duplex mode. The twisted pair ports are IEEE 802.3u-compliant and Auto-
Negotiate the duplex mode setting.
Note
For the switch to set the duplex mode for each port correctly, the
end nodes that you connect to the switch ports must be configured
for Auto-Negotiation. Otherwise, a duplex mode mismatch can
occur, affecting network performance. For further information, refer
to “Duplex Mode” on page 30.
Each twisted pair port has a maximum operating distance of 100 m
(328 feet). For 10 Mbps operation, Category 3 or better 100 ohm shielded
or unshielded twisted pair cabling is required. For 100 or 1000 Mbps
operation, Category 5 and Enhanced Category 5 (5E) 100 ohm shielded
or unshielded twisted pair cabling is required.
The twisted pair ports are auto-MDI. They automatically configure
themselves as either MDI or MDI-X, which allows you to use straight
through or crossover twisted pair cables to connect devices to the ports.
Uplink Combo
Ports
The two uplink combo ports (ports 49 and 50) consist of an SFP port and a
redundant twisted-pair port. The SFP ports support fiber optic connectivity
at 100FX and 1000 SX/LX, while the twisted pair ports support 10/100/
1000Base-T. If both ports of a combo pair are connected to the network,
traffic is switched through the SFP port and the corresponding twisted pair
port acts a redundant port in case of failure.