Allied Telesis AT-AR3050S, Installation Manual

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Chapter 4: Cabling the Networking Ports
38
Cabling the Twisted Pair Ports
Here are the guidelines to cabling the 10/100/1000Base-T twisted pair
ports.

The connectors on the cables should fit snugly into the ports, and
the tabs should lock the connectors into place.

The default setting for the wiring configurations of the ports is auto-
MDI/MDI-X. The default setting is appropriate for router ports that
are connected to 10/100Base-TX network devices that also
support auto-MDI/MDI-X.

The default auto-MDI/MDI-X setting is not appropriate for router
ports that are connected to 10/100Base-TX network devices that
do not support auto-MDI/MDI-X and have a fixed wiring
configuration. For router ports connected to those types of network
devices, you should disable auto-MDI/MDI-X and set the wiring
configurations manually.

The appropriate MDI/MDI-X setting for a router port connected to a
10/100Base-TX network device with a fixed wiring configuration
depends on the setting of the network device and whether the
router and network device are connected with straight-through or
crossover cable. If you are using straight-through twisted pair
cable, the wiring configurations of a port on the router and a port
on a network device must be opposite each other, such that one
port uses MDI and the other MDI-X. For example, if a network
device has a fixed wiring configuration of MDI, you must disable
auto-MDI/MDI-X on the corresponding router port and manually set
it to MDI-X. If you are using crossover twisted pair cable, the wiring
configurations of a port on the router and a port on a network
device must be the same.

The default speed setting for the ports is Auto-Negotiation. This
setting is appropriate for ports connected to network devices that
also support Auto-Negotiation.

The default speed setting of Auto-Negotiation is not appropriate for
ports connected to 10/100Base-TX network devices that do not
support Auto-Negotiation and have fixed speeds. For those router
ports, you should disable Auto-Negotiation and set the port’s
speed manually to match the speeds of the network devices.

The 10/100/1000Base-T ports must be set to Auto-Negotiation, the
default setting, to operate at 1000Mbps.

The default duplex mode setting for the ports is Auto-Negotiation.
This setting is appropriate for ports connected to network devices
that also support Auto-Negotiation for duplex modes.

The default duplex mode setting of Auto-Negotiation is not
appropriate for ports connected to network devices that do not