Datasheet

CHAPTER
1-1
PA-4E1G Serial Port Adapter Installation and Configuration
OL-3065-05
1
Overview
This chapter describes the PA-4E1G port adapter and contains the following sections:
• Port Adapter Overview, page 1-1
• Interface Specifications, page 1-2
• LEDs, page 1-4
• Cables, Connectors, and Pinouts, page 1-4
• Port Adapter Slot Locations on the Supported Platforms, page 1-7
• Identifying Interface Addresses, page 1-19
Port Adapter Overview
The PA-4E1G, shown in Figure 1-1 and Figure 1-2, provides up to four E1 synchronous serial interfaces,
which are compatible with and specified by G.703/G.704. The PA-4E1G network interfaces provide a
connection between standard serial interfaces such as V.35 to telephone lines or Post, Telephone, and
Telegraph (PTT) networks. Each PA-4E1G interface operates in full-duplex mode at E1 (2.048 Mbps)
speed.
The PA-4E1G interfaces do not operate in the data terminal equipment (DTE) and data communications
equipment (DCE) modes that are typical of data communications interfaces. The PA-4E1G interfaces
operate with either a line-recovered or an internal clock signal. The default is for a line clock signal that
the interface recovers from the received data stream. The interface can also operate with an internal clock
signal. The PA-4E1G generates the internal clock signal; the interface does not use the motherboard or
system clock.
Figure 1-1 PA-4E1G—75-Ohm, Unbalanced (Front Panel View)
EN
0 1 2 3
LB LA
RA
LB LA
RA
LB LA
RA
LB LA
RA
H9600
E1 G.703/G.704-75 OHM