Allied Telesis AT-GS950/8POE - Manual (Page 20)

Chapter 1: Overview
20
10/100/1000Base-T Twisted Pair Ports
This section describes the twisted pair ports on the switches.
Connector Type
The ports are 8-pin RJ-45 connectors that use four pins at 10 or 100 Mbps
and all eight pins at 1000 Mbps. For the pin assignments, refer to “RJ-45
Twisted Pair Port Pinouts” on page 65.
Speed A port’s speed can be 10, 100, or 1000 Mbps. The speed can be set
automatically through Auto-Negotiation, the default setting, or manually
with the system software.
Note
To operate at 1000 Mbps, a twisted pair port must be set to Auto -
Negotiation. The speed of a twisted pair port cannot be set manually
to 1000 Mbps.
Duplex Mode
A twisted pair port can operate in either half- or full-duplex mode. (Full-
duplex mode is the only mode available when a port is operating at 1000
Mbps.) The twisted pair ports are IEEE 802.3u-compliant and Auto-
Negotiate the duplex mode setting.
You can disable Auto-Negotiation on one or all of the switch ports so that
you can set the duplex mode manually through the system software.
Note
For a port to successfully Auto-Negotiate its duplex mode with a 10
or 100 Mbps end node, the end node must be configured for Auto-
Negotiation. Otherwise, a duplex mode mismatch can occur. A port
using Auto-Negotiation defaults to half-duplex if it detects that the
end node is not using Auto-Negotiation. This results in a mismatch if
the end node is operating at a fixed duplex mode of full-duplex.
To avoid this problem when connecting an end node with a fixed
duplex mode of full-duplex to a port, use the system software to
disable Auto-Negotiation on the port and set the port speed and
duplex mode manually.
Maximum
Distance
The ports have a maximum operating distance of 100 meters (328 feet).