Allied Telesis CentreCOM AT-3675 Bridge User Manual page 23

Figure 14: Pin 1 Orientation on an
RJ45 Connector
Figure 15: 10BASE-T UTP
Cabling Hub-to-Hub (Cross-Over)
Some situations require a DCE-to-DCE connection, for example, when hubs
are cascaded. This can be accomplished with a standard cross-over cable, as
illustrated in Figure 15.
UTP MAU
RJ45 PIN
1
TD +
2
TD -
3
RD +
4
Not Used
5
Not Used
6
RD -
7
Not Used
8
Not Used
In both the cross-over and straight-through instances, the wire is twisted
pair. Figure 16 demonstrates usable and unusable cable wire pairings for the
straight-through configuration.
CentreCOM AT-3675 SNMP-Manageable Learning Bridge
Pin 1
UTP MAU
RJ45 PIN
1
TD +
2
TD -
3
RD +
4
Not Used
5
Not Used
6
RD -
7
Not Used
8 Not Used
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