9
CHAPTER 2: Introduction
Figure 2-1. Typical G.703 Codirectional Converter application.
The Converter also provides diagnostic capabilities with analog and digital
loopbacks. Both loops are activated by the front-panel pushbuttons. You can
use the Converter’s front-panel LEDs to continuously monitor the main
channel’s activity and synchronization.
2.2 Timing Theory
2.2.1 CCITT G.703 S
IGNALING
The CCITT G.703 codirectional signal is made up of two balanced signals:
The
receive
and
transmit signals
carry timing and data information.
The clock signal associated with each direction of transmission travels
in the same direction as the data signal (see Figure 2-2).
G.703
Codirectional
Converter
