Allied Telesis AT-9448Ts/XP (Basic Layer 3) - Manual (Page 26)

Chapter 1: Overview
26
10/100/1000Base-T Twisted Pair Ports
This section describes the twisted pair ports on the switches. (This section
does not apply to the AT-9408LC/SP Switch.)
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 80.
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 AT-S63 Management 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 manually set
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 AT-S63 Management
Software.
Note
In order for a switch port to successfully Auto-Negotiate its duplex
mode with a 10 or 100 Mbps end node, the end node should also be
configured for Auto-Negotiation. Otherwise, a duplex mode
mismatch can occur. A switch 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 switch port, use the AT-S63
Management Software to disable Auto-Negotiation on the port and
set the port speed and duplex mode manually.