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Chapter 6: Installing the Transceivers and Cabling the Ports
128
Guidelines to Cabling the AT-SBx31GP24, AT-SBx31GT24, and AT-
SBx31GT40 Line Cards
Here are the guidelines to cabling the 10/100/1000Base-T twisted pair
ports on the AT-SBx31GT24, AT-SBx31GP24, and AT-SBx31GT40 Line
Cards:
The 10/100/1000Base-T twisted pair ports on the AT-SBx31GT24
and AT-SBx31GP24 Line Cards have 8-pin RJ45 connectors.
The 10/100/1000Base-T twisted pair ports on the AT-SBx31GT40
Line Card have 8-pin RJ point 5 connectors.
The cable specifications for the ports on the AT-SBx31GT24 and
AT-SBx31GT40 Line Cards are listed in Table 1 on page 36.
The cable specifications for the ports on the AT-SBx31GP24 Line
Card are listed in Figure 2 on page 37.
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-SBx31GP24
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.
The MDI/MDIX wiring configuration of the ports is set automatically with
automatic MDIX detection. You may not disable this feature on the ports.