Allied-telesis AT-FS750/48 User Manual download pdf (Page 20)

Chapter 1: Overview

Ports

The AT-FS750/48 Fast Ethernet WebSmart switch features 48 10/100/

Base-T twisted pair ports, two combination twisted pair/SFP ports. See the

following sections for more information:

 “Twisted Pair Ports,” next

 “Uplink Combo Ports,” next

Twisted Pair

Ports

Ports 1-48 on the AT-FS750/48 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 55.)

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 100 Mbps, the switch sets the

port connected to the end node to 100 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 28.

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. This feature 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.

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Allied-telesis AT-FS750/48 User Manual Page 20

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