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Chapter 1 - Introduction HCD-E1
Installation & Operation Manual
1-16 Functional Description 01/01/01 08:07
Figure 1-8 Sublink Timing, Flow of Timing Signals in a Typical Application
Main Principles of
Operation
This section describes the E1 and the HDSL environments, to provide the
background information required for the understanding of the configuration
parameters of the HCD-E1 system.
The E1 (CEPT) Environment
The E1 line interfaces of the HCD-E1 comply with the applicable
requirements of ITU-T Rec. G.703, G.704, G.706, G.732, and G.823.
E1 Signal Structure
The E1 line operates at a nominal rate of 2.048 Mbps, using a line signal
encoded according to the High-Density Bipolar 3 (HDB3) code. The data
transferred over the E1 line is organized in frames. Each E1 frame includes
256 bits. The E1 frame format is shown in Figure 1-9.