Allied Telesis AT-9408LC/SP Series, Руководство по установке

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Chapter 1: Overview
20
10/100/1000Base-T Twisted Pair Ports
This section describes the twisted pair ports on the AT-9424T/GB,
AT-9424T/SP, AT-9448Ts, AT-9448T/SP, and AT-9448Ts/XP switches.
Connector Type
The ports have 8-pin RJ-45 connectors. The ports use four pins when
operating at 10 or 100 Mbps and all eight pins when operating at 1000
Mbps. For pin assignments, refer to “RJ-45 Twisted Pair Port Pinouts” on
page 71.
Speed
The ports can operate at 10, 100, or 1000 Mbps. The speed can be set
automatically through Auto-Negotiation, which is the default setting, or you
can set the speed manually through the AT-S63 management software.
Note
A port must be set to Auto -Negotiation to operate at 1000 Mbps.
You cannot manually set the speed of a twisted pair port 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.