Allied Telesis AT-SBx81CFC960, Installation Manual

Page: 142 / 324

Chapter 8: Installing the Transceivers and Cabling the Ports
142 Section II: Installing the Chassis
Cabling Guidelines for the Twisted Pair Ports on the AT-SBx81GT24,
AT-SBx81GT40, and AT-SBx81GP24 Line Cards
Here are the guidelines to cabling the 10/100/1000Base-T twisted pair
ports on the AT-SBx81GT24, AT-SBx81GP24, and AT-SBx81GT40 Line
Cards:
 The 10/100/1000Base-T twisted pair ports on the AT-SBx81GT24
and AT-SBx81GP24 Line Cards have 8-pin RJ45 connectors.

The 10/100/1000Base-T twisted pair ports on the AT-SBx81GT40
Line Card have 8-pin RJ point 5 connectors.
 The cable specifications for the 10/100/1000Base-T twisted pair
ports on the AT-SBx81GT24 and AT-SBx81GT40 Line Cards are
listed in Table 12 on page 52.
 The cable specifications for the 10/100/1000Base-T twisted pair
ports on the AT-SBx81GP24 Line Card are listed in Table 13 on
page 52.
 The connectors on the cables should fit snugly into the ports, and
the tabs should lock the connectors into place.

The default setting for PoE on the ports on the AT-SBx81GP24
Line Card is enabled.
 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 network devices that do not support Auto-
Negotiation and have fixed speeds or 10 or 100 Mbps. For those
switch ports, 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
support Auto-Negotiation and have a fixed duplex mode. 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.