Allied Telesis GS900/5E User Manual

AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide

15

The following sections describe hardware features of the AT-GS900/16 
and AT-GS900/24 Fanless Gigabit Ethernet switches:

ˆ

System and Port LEDs

ˆ

Twisted Pair Ports

ˆ

AC Power Connector

The AT-GS900/16 Fanless Gigabit Ethernet switch features 16 twisted 
pair ports, and the AT-GS900/24 Fanless Gigabit Ethernet switch features 
24 twisted pair ports. 

The twisted pair ports feature 8-pin RJ-45 connectors. (For the port 
pinouts, refer to RJ-45 Twisted Pair Port Connectors “RJ-45 Twisted Pair 
Port Connectors” on page 39.)

The ports are 10Base-T, 100Base-TX, and 1000Base-T compliant and are 
capable of 10 megabits per second (Mbps), 100 Mbps, and 1000 Mbps 
speeds. The ports are IEEE 802.3u Auto-Negotiation compliant. 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.

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. 

For the switch to set the duplex mode for each port correctly, the 
end-nodes that you connect to the switch ports should also use 
Auto-Negotiation. Otherwise, a duplex mode mismatch can occur, 
affecting network performance. For further information, refer to 
“Duplex Mode” on page 19.