Specifications

1-6
Cisco PA-FE-TX and Cisco PA-FE-FX Fast Ethernet 100BASE-T Port Adapter Installation and Configuration
OL-2899-02
Chapter 1 Overview
Cables, Connectors, and Pinouts
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.
Figure 1-6 PA-FE-TX RJ-45 Connector Pinout
Note Referring to the RJ-45 pinout in Table 1-3 on page 1-8, proper common-mode line terminations
should be used for the unused Category 5, FTP 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, 100BASE-TX port circuitry in
the PA-FE-TX.
Depending on your RJ-45 interface cabling requirements, use the pinouts in Figure 1-7 and Figure 1-8.
Figure 1-7 Straight-Through Cable Pinout—PA-FE-TX RJ-45 Connection to a Hub or Repeater
Figure 1-8 Crossover Cable Pinout—PA-FE-TX RJ-45 Connections Between Hubs and Repeaters
Figure 1-9 on page 1-7 shows the duplex SC connector (one required for both transmit and receive), and
Figure 1-10 on page 1-7 shows the simplex SC connector (two required, one for each transmit and
receive) used for PA-FE-FX optical-fiber connections. These multimode optical-fiber cables are
commercially available and are not available from Cisco Systems.
Pin Description
1 Transmit data + (TxD+)
2TxD–
3 Receive data + (RxD+)
6RxD–
Hub or repeaterFEIP
5 TxD+
6 TxD–
3 RxD+
4 RxD–
5 RxD+
6 RxD–
3 TxD+
4 TxD–
H3137
Hub or LAN switch
3 TxD+
6 TxD–
1 RxD+
2 RxD–
3 TxD+
6 TxD–
1 RxD+
2 RxD–
H3138
Hub or LAN switch