AT-GS900MX Series Installation Guide for VCStack
23
10/100/1000Base-T Twisted Pair Ports
The AT-GS900MX Series switches have 24 or 48 10/100/1000Base-T
ports, depending on the model.
Two twisted pair ports are paired with the SFP slots to form combo
ports. For information, refer to “Combo Twisted Pair Ports and SFP
Slots” on page 32.
Speed The ports can operate at 10, 100, or 1000 Mbps. The speeds may be set
manually using the management software or automatically with Auto-
Negotiation (IEEE 802.3u), the default setting.
The ports must be set to Auto-Negotiation to function at 1000 Mbps
and are not compatible with devices that are not IEEE 802.3u
compliant.
Duplex Mode The twisted pair ports can operate in either half- or full-duplex mode. The
duplex mode of a port, like port speed, may be set manually using the
management software or automatically with Auto-Negotiation (IEEE
802.3u), the default setting.
The speed and duplex mode settings of a port may be set independently
of each other. For example, a port may be configured such that its speed
is set manually while its duplex mode is established through Auto-
Negotiation.
A switch port should not use Auto-Negotiation to set its duplex mode
if it is connected to a network device that does not support Auto-
Negotiation for 10 or 100 Mbps operation and has a fixed duplex
mode of full-duplex. Otherwise, a duplex-mode mismatch may occur
in which a switch port and a network device operate at different
duplex modes. The duplex modes of switch ports that are connected
to network devices that do not support Auto-Negotiation should be
set manually through the management software.
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