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Chapter 1: Overview
18
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.