Specifications

20 Second-Generation Fast Ethernet Interface Processor (FEIP2) Installation and Configuration
What Is the FEIP2?
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 4 lists the pinouts and signals for the FEIP2-2TX’s RJ-45 connectors.
Table 4 RJ-45 Connector Pinout (FEIP2-2TX)
Note Referring to the RJ-45 pinout in Table 4, 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, 100BASE-TX port circuitry in
the FEIP2-2TX.
Depending on your RJ-45 interface cabling requirements, use the pinouts in Figure 13 and
Figure 14.
Figure 13 Straight-Through Cable Pinout, RJ-45 Connection to a Hub or Repeater (FEIP2-2TX)
Figure 14 Crossover Cable Pinout, RJ-45 Connections Between Hubs and Repeaters (FEIP2-2TX)
Pin Description
1 Receive Data + (RxD+)
2 RxD–
3 Transmit Data + (TxD+)
6 TxD–
Hub or repeaterFEIP
3 TxD+
6 TxD–
1 RxD+
2 RxD–
3 RxD+
6 RxD–
1 TxD+
2 TxD– H3137
Hub or repeater
3 TxD+
6 TxD–
1 RxD+
2 RxD–
3 TxD+
6 TxD–
1 RxD+
2 RxD– H3138
Hub or repeater