Allied-telesis AT-FS750/24 User Manual download pdf (Page 18)

Chapter 1: Overview

Ports

The AT-FS750/16 and AT-FS750/24 Fast Ethernet Smart Switches

feature 16 or 24 twisted pair ports and two pairs of uplink combo ports.

Twisted Pair

Ports

The twisted pair ports are 10Base-T and 100Base-TX compliant. They

automatically set their speed and duplex mode with IEEE 802.3u Auto-

Negotiation. If desired, you can disable Auto-Negotiation on a port and

manually set the speed and duplex mode.

Note

If a switch port is connected to an end node that is not using Auto-

Negotiation, you should disable Auto-Negotiation on the port and set

its speed and duplex mode manually. Otherwise, a duplex mode

mismatch can occur.

The ports have 8-pin RJ-45 connectors. For the port pinouts, refer to

“Connectors and Port Pinouts” on page 42.

The ports have a maximum operating distance of 100 m

(328 feet). For 10 Mbps operation, the ports require Category 3 or better

100 ohm shielded or unshielded twisted pair cabling. For 100 Mbps

operation, the ports require Category 5 or Enhanced Category 5 (5E) 100

ohm shielded or unshielded twisted pair cabling.

Also featured on the ports is auto-MDI, which automatically configures the

ports as MDI or MDI-X. This allows you to use straight-through twisted pair

cable regardless of the configuration of the ports on the end nodes.

Uplink Combo

Ports

The switch has two pairs of uplink ports, each consisting of one 10/100/

1000Base-T twisted pair port and one slot for an optional SFP transceiver.

The ports are numbered 17 and 18 on the AT-FS750/16 Switch and 25

and 26 on the AT-FS750/24 Switch. These combo ports can be used to

connect high speed devices to your network or to connect devices over

large distances.

You can use one port in a combo pair at a time. A link on an SFP

transceiver always takes precedence over a link on a 10/100/1000Base-T

twisted pair port in the same combo pair. If the SFP slot is empty or if it

has an SFP module but the module does not have a link to an end node,

the 10/100/1000Base-T twisted pair port of the pair is active. If an SFP

transceiver is installed and has a link to an end node, the twisted pair port

in the pair is inactive.

RS-232 Console

Port

The RS-232 console port is for local management of the switch with the

AT-S80 Management Software. Local management uses the

management cable supplied with the switch.

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