This section applies to the 10/100/1000Base-T ports on the AT- SBx81GT24, AT-SBx81GT40, and AT-SBx81GP24 PoE Ethernet Line Cards.
The ports on the AT-SBx81GT24 and AT-SBx81GP24 Line Cards have 8- pin RJ-45 connectors. The ports on the AT-SBx81GT40 Line Card have 8- pin RJ point 5 connectors. The ports use four pins at 10 or 100 Mbps and all eight pins at 1000 Mbps. The pin assignments are listed in “Port Pinouts” on page 239.
The ports can operate at 10, 100, or 1000 Mbps. The speeds can be set automatically through Auto-Negotiation, the default setting, or manually with the AlliedWare Plus Operating System.
Note
Twisted-pair ports have to be set to Auto-Negotiation to operate at 1000 Mbps. You cannot manually set twisted-pair ports to 1000 Mbps.
The twisted-pair ports on the AT-SBx81GT24 and AT-SBx81GP24 Line Cards can operate in either half- or full-duplex mode at 10 or 100 Mbps. Ports operating at 1000 Mbps can only operate in full-duplex mode. The twisted-pair ports are IEEE 802.3u-compliant and Auto-Negotiate 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 100 Mbps 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 Operating System.
Note
The ports on the AT-SBx81GT40 Line Card only support full-duplex mode.
