Allied Telesis AlliedWare Plus AT-GS980M/52, Installation Manual, Page: 22 / 94

Chapter 1: Overview
22
10/100/1000Mbps Twisted Pair Ports
The following sections describe the twisted pair ports on the AT-GS980M/
52 and AT-GS980M/52PS Switches.
Connector Type
The twisted pair ports have 8-pin RJ-45 connectors. The ports use four
pins at 10 or 100Mbps and all eight pins at 1000Mbps. The pin
assignments are listed in “RJ-45 Twisted Pair Port Pinouts” on page 92.
Speed
The ports can operate at 10, 100, or 1000Mbps. The switch can set the
speeds automatically through Auto-Negotiation, the default setting, or you
can manually configure them with the AlliedWare Plus Operating System.
Note
Twisted-pair ports have to be set to Auto-Negotiation to operate at
1000Mbps.
Duplex Mode
The twisted-pair ports on the switches can operate in either half- or full-
duplex mode at 10 or 100Mbps. Ports operating at 1000Mbps can only
operate in full-duplex mode. The twisted-pair ports are IEEE 802.3u-
compliant and use Auto-Negotiate to set the duplex mode setting.
You can disable Auto-Negotiation on the ports and set the duplex mode
manually.
Note
Switch ports that are connected to 10 or 100Mbps end nodes that
are not using Auto-Negotiation should not use Auto-Negotiation to
set their speed and duplex mode settings, because duplex mode
mismatches might occur. You should disable Auto-Negotiation and
set the speed and duplex mode settings manually with the
AlliedWare Plus Management Software.
Maximum
Distance
The ports have a maximum operating distance of 100 meters (328 feet).
Cable
Requirements
The minimum cable requirements for the ports are listed here.

10Mbps or 100Mbps: Standard TIA/EIA 568-B-compliant Category
3 shielded or unshielded cabling.
 1000Mbps: Standard TIA/EIA 568-A-compliant Category 5 or TIA/
EIA 568-B-compliant Enhanced Category 5 (Cat 5e) shielded or
unshielded cabling.