User Manual
U-SYS IAD208E(M) Integrated Access Device Chapter 1 System Overview
Huawei Technologies Proprietary
1-6
(1) Local power supply interface
(2) Upstream interface
(3)–(10) 8 channels of unified
interfaces for data and voice services
(11) Local maintenance serial
port
Figure 1-3
External interface of the IAD208E(M)
1.3.2 Software Structure
The software system of the IAD208E(M) consists of the main
CPU software and DSP software of the CSP. As the core of the IAD,
the main CPU software implements the call control of the whole
system, management and maintenance function and forwarding of
media flow. The DSP software mainly implements the coding and
decoding of voice, detection and generation of dual-tone
multifrequency (DTMF)/ frequency shift keying (FSK), voice activity
detection (VAD) and comfort noise generation (CNG).
In terms of software structure, the IAD208E(M) consists of the
following functionality modules.
Management, maintenance and operation system module
Service access module
SPC service processing module
VoIP service processing module
Protocol processing module
