UTP Reference
48
UTP Hub-to-MAU
Wiring
Figure 47 shows a UTP cable with an RJ45 connector. For a 10BASE-T link
between a hub and a Medium Attachment Unit (MAU) or Network Interface
Controller (NIC), the cable is wired straight-through. That is, an RJ45
receptacle at the hub would wire pin-to-pin to the RJ45 receptacle at the
MAU, as shown in Figure 48.
Figure 47:
RJ45
Pin 1
Figure 48:
Hub-to-MAU
Wiring (A) Usable
and (B) Unusable
Not Used
RD-
Not Used
Not Used
RD+
TD-
TD+
Not Used
Not Used
RD-
Not Used
Not Used
RD+
TD-
TD+
Not Used
RJ45 Pin
RJ45 Pin
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
1
Pair twisted as per Level 3, 4 or 5 cable.
1
A
Not Used
RD-
Not Used
Not Used
RD+
TD-
TD+
Not Used
Not Used
RD-
Not Used
Not Used
RD+
TD-
TD+
Not Used
RJ45 Pin
RJ45 Pin
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
This cable will not work for 10BASE-T.
Note that 3 and 6 are twisted, but are not a pair.
B
