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SwitchBlade x3112 Installation Guide
35
10/100/1000Base-T Twisted Pair Ports
This section applies to the 10/100/1000Base-T ports on the AT-
SBx31GT24, AT-SBx31GT40, and AT-SBx31GP24 PoE Ethernet Line
Cards.
Connector Type The ports on the AT-SBx31GT24 and AT-SBx31GP24 Line Cards have 8-
pin RJ-45 connectors. The ports on the AT-SBx31GT40 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 220.
Speed 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 SwitchBlade x3112 Management Software.
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.
Duplex Mode The twisted-pair ports on the AT-SBx31GT24 and AT-SBx31GP24 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
SwitchBlade x3112 Management Software.
Note
The ports on the AT-SBx31GT40 Line Card only support full-duplex
mode.