Datasheet

1-5
PA-4E1G Serial Port Adapter Installation and Configuration
OL-3065-05
Chapter 1 Overview
Cables, Connectors, and Pinouts
The port adapter end of all E1-G.703/G.704 adapter cables is a DB-15 connector. At the network end,
the adapter cable for unbalanced (75-ohm) connections uses a BNC connector. The adapter cables for
balanced (120-ohm) connections use DB-15, twinaxial, or RJ-45 connections to accommodate
connection standards in different countries.
Note You must connect the correct type of interface cable for the port to operate.
Warning It is a requirement of the statutory approval of the E1-G.703/G.704 interface that the jackscrews of the
connector backshell are securely screwed down while the port adapter is operating.
Cables for balanced and unbalanced mode are available with the following types of network-end
connectors:
• Unbalanced (75-ohm) coaxial cables with BNC connectors at the network end, which are used
primarily for connection in the United Kingdom. (See Figure 1-5.)
Figure 1-5 E1-G.703/G.704 Interface Cable for Unbalanced Connections—with BNC Connectors
and Coaxial Cables
• Balanced (120-ohm) cable with a DB-15 connector at the network end. (See Figure 1-6.)
Figure 1-6 E1-G.703/G.704 Interface Cable for Balanced Connections—with DB-15 Connectors on
Both Ends
•
Balanced (120-ohm) twinaxial split cable (with separate transmit and receive cables), each with a
twinaxial connector. (See Figure 1-7.)
Figure 1-7 E1-G.703/G.704 Interface Cable for Balanced Connections—with Twinaxial
Connectors and Cables
H2421
H2476
H2424