Chapter 1: Overview
14
Ports
The AT-FS750/16 and AT-FS750/24 Fast Ethernet Smart switches feature
16 or 24 twisted pair ports and two uplink combo ports.
Twisted Pair
Ports
The twisted pair ports feature 8-pin RJ-45 connectors. (For the port
pinouts, refer to “Connectors and Port Pinouts” on page 43.)
The ports on the AT-FS750/16 and AT-FS750/24 switches are 10Base-T
and 100Base-TX compliant and are capable of 10 megabits per second
(Mbps) and 100 Mbps speeds.
The ports on both switches 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 switches 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
In order for the switch to set the duplex mode for each port correctly,
the end nodes that you connect to the switch ports should also use
Auto-Negotiation. Otherwise, a duplex mode mismatch can occur,
affecting network performance. For further information, refer to
“Duplex Mode” on page 20.
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 either
straight-through or crossover twisted pair cables to connect devices to the
ports.
Uplink Combo
Ports
Since all other twisted pair ports on the AT-FS750/16 and AT-FS750/24
switches are operating at 10 Mbps and 100 Mbps speeds, the uplink
combo ports are there to provide fiber optic connectivity for the 1000 Mbps
speed. Each uplink combo port consists of one 10/100/1000Base-T
twisted pair port and one SFP port (ports 17 and 18 on the AT-FS750/16,
