Specifications

1-5

PA-8E 10BaseT Ethernet Port Adapter Installation and Configuration

OL-3494-04

Chapter 1 Overview

Cables, Connectors, and Pinouts

The interface connectors on the PA-8E are eight individual RJ-45 receptacles. You can use all eight

connectors simultaneously. Each connector supports IEEE 802.3 and Ethernet 10BaseT interfaces

compliant with appropriate standards. The RJ-45 connectors require external transceivers.

Cisco Systems does not supply Category 5 UTP RJ-45 cables; these cables are available commercially.

Figure 1-3 shows the RJ-45 connectors. Table 1-4 lists the pinouts and signals for the RJ-45 connectors.

Figure 1-3 PA-8E RJ-45 Connector—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.

Note Referring to the RJ-45 pinout in Table 1-4, 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 port circuitry in the PA-8E.

Table 1-4 PA-8E RJ-45 Connector Pinout

Pin Description

1 Transmit Data + (TxD+)

2TxD–

3 Receive Data + (RxD+)

6RxD–

H2936

8 7 6 5 4 3 2 1

RJ-45 connector