Allied Telesis GS950 PS Series, Installation Manual, Page: 76 / 108

Chapter 6: Cabling the Networking Ports
76
Cabling the Copper Ports
Here are the guidelines to cabling the 10/100/1000Mbps copper ports:
 The cable specifications are listed in Table 1 on page 24.
 The connectors on the cables should fit snugly into the ports, and
the tabs should lock the connectors into place.
 The default speed setting 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 10/100Mpbs network devices that do not
support Auto-Negotiation and have fixed speeds. For those switch
ports, you should disable Auto-Negotiation and set the port’s
speed manually to match the speeds of the network devices.
 The 10/100/1000Mbps 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
support Auto-Negotiation and have a fixed duplex mode. You
should disable Auto-Negotiation on those ports and set their
duplex modes manually to avoid the possibility of duplex mode
mismatches. A switch port using Auto-Negotiation defaults to half-
duplex if it detects that the end node is not using Auto-Negotiation.
This can result in a mismatch if the end node is operating at a fixed
duplex mode of full-duplex.
 The default setting for wiring configurations for ports at 10/
100Mbps is auto-MDI/MDI-X. The default setting is appropriate for
network devices that also support auto-MDI/MDI-X.

The default auto-MDI/MDI-X setting is not appropriate for switch
ports that are connected to 10/100Mbps network devices that do
not support auto-MDI/MDI-X and have a fixed wiring configuration.
For switch ports connected to these types of network devices, you
should disable auto-MDI/MDI-X and set the wiring configurations
manually.
 The appropriate MDI/MDI-X setting for switch ports connected to
10/100Mbps devices with a fixed wiring configuration depends on
the setting of the network device and whether the switch 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 switch and a port on a
network device must be opposite each other, such that one port