Overview
24
10/100Base-TX Twisted Pair Ports
The twisted pair ports featured on the AT-8000 Series Switch are
described below.
Type of
Connector
All twisted pair ports feature 8-pin RJ-45 connectors. For the port
pinouts, refer to ”RJ-45 Twisted Pair Port Pinouts” on page 85.
Speed The twisted pair ports are 10/100Base-TX compliant and are capable of
both 10 megabits per second (Mbps) and 100 Mbps speeds. You can set
the port speed manually or, since the ports are IEEE 802.3u Auto-
Negotiation compliant, you can let the switch set each port’s speed
automatically. With Auto-Negotiation, the switch automatically matches
the highest possible common speed between each switch port and each
end-node. For example, if an end-node is capable of only 10 Mbps, the
switch sets the port connected to the end-node to 10 Mbps.
Note
Auto-Negotiation is activated as the default on all twisted pair ports
on the switch. To deactivate Auto-Negotiation and set the speeds
manually, refer to the AT-S39 Management Software User’s
Guide.
Duplex Mode Each twisted pair port on the switch can operate in either half- or full-
duplex mode. The twisted pair ports are IEEE 802.3u-compliant and will
Auto-Negotiate the duplex mode setting.
If desired, Auto-Negotiation on one or all of the switch ports can be
disabled so that you can set the duplex mode manually through the
switch’s management software.
Note
In order for a switch port to successfully Auto-Negotiate its duplex
mode with an end-node, the end-node should also be using Auto-
Negotiation. Otherwise, a duplex mode mismatch can occur. A
switch port, using Auto-Negotiation, will default to half-duplex if it
detects that the end-node is not using Auto-Negotiation. This will
result in a mismatch if the end-node is operating at a fixed duplex
mode of full-duplex. Consequently, when connecting an end-node
with a fixed duplex mode of full-duplex to a switch port, you should
use the AT-S39 management software to disable Auto-Negotiation
on the port and set the port speed and duplex mode manually.
Maximum
Distance
Each twisted pair port has a maximum operating distance of 100 meters
(328 feet).
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