User manual
CentreCOM AT-3675 SNMP-Manageable Learning Bridge
21
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.
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.
Figure 14: Pin 1 Orientation on an
RJ45 Connector
Pin 1
Figure 15: 10BASE-T UTP
Cabling Hub-to-Hub (Cross-Over)
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
TD +
TD -
RD +
Not Used
TD +
TD -
RD +
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
RD -
RD -
UTP MAU
RJ45 PIN
UTP MAU
RJ45 PIN