Receptacles, Cables, and Pinouts
Figure 1-8 shows the RJ-45 cable connectors. Cisco Systems does not supply Category 5 UTP RJ-45 cables; these cables are available commercially. Table 1-1 lists the pinouts and signals for the PA-FE-TX RJ-45 connectors.
Figure 1-8 PA-FE-TX RJ-45 Connections—Plug and Receptacle
Warning The ports labeled “Ethernet,” “10BaseT,” “Token Ring,” “Console,” and “AUX” are
safety extra-low voltage (SELV) circuits. SELV circuits should only be connected to other SELV circuits. Because the BRI circuits are treated like telephone-network voltage, avoid connecting the SELV circuit to the telephone network voltage (TNV) circuits.
Table 1-1 | PA-FE-TX RJ-45 Connector Pinout |
| |
Pin | Description |
| |
1 | Receive Data + (RxD+) |
| |
2 | RxD– |
| |
3 | Transmit Data + (TxD+) |
| |
6 | TxD– |
| |
Note Referring to the RJ-45 pinout in Table 1-1, proper common-mode line terminations should be used for the unused Category 5, UTP cable pairs 4/5 and 7/8. Common-mode termination reduces the contributions to electromagnetic interference (EMI) and susceptibility to common-mode sources. Wire pairs 4/5 and 7/8 are actively terminated in the RJ-45, 100BaseTX port circuitry in the PA-FE-TX.
Depending on your RJ-45 interface cabling requirements, use the pinouts in Figure 1-9 and Figure 1-10.
Figure 1-9 Straight-Through Cable Pinout—PA-FE-TX RJ-45 Connection to a Hub or Repeater
Hub or repeater
3RxD+
6RxD–
1-6PA-FE-TX and PA-FE-FX Fast Ethernet 100BaseT Port Adapter Installation and Configuration
