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Cables
This section describes the Ethernet interface cables you may need to install between the router and
an Ethernet transceiver or MAU. It also provides cabling configurations to use with UTP networks.
AUI (Ethernet Transceiver) Cable
The standard 15-pin AUI Ethernet connectors require an external transceiver and, unless the
transceiver plugs directly into the router rear panel connector, also require an Ethernet transceiver
cable (or AUI cable) to connect the transceiver to the router. If you are building a transceiver cable,
refer to the pinout listed in Table 2.
Twisted-Pair Cabling
There are several types of twisted-pair cable. Unshielded twisted-pair (UTP) cable should be 26 to
22 American wire gauge (AWG)—0.4- to 0.6-millimeter (mm)—wire in a multiwire cable with
100-ohms impedance. The 802.3 specification states that the maximum length of a 10BaseT link
segment is 100 meters or 328 feet of UTP wiring. Do not exceed these limits.
If you are not connected to a hub, and another 10BaseT transceiver applique is connected to the
opposite end of your link, the UTP cabling must be crossed as shown in Figure 4. The RD– and RD+
signals must be swapped with the TD– and TD+ signals. When the opposite end of your link is
connected to a hub, the hub performs this crossover function, so it is not necessary to cross the
cables.
Local applique
RJ-45 pins
Not used
Not used
Not used
Not used
Figure 4
TD+
1
TD-
2
RD+
3
4
5
RD-
6
7
8
Applique-to-Applique UTP Cable Diagram
Installing the CSC-MEC and CSC-C2MEC Multiport Ethernet Controller Cards 5
Opposite applique
RJ-45 pins
1
TD+
2
TD-
3
RD+
4
Not used
5
Not used
6
RD-
7
Not used
8
Not used
Description of Parts
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