Chapter
Erro! Estilo não definido.
Erro! Estilo não definido.
4-13
4.2.3.2 Operating Principles of ATIGN
The operating principles of ATUG board are shown in Fig. 4.2-3.
HDLC channel
CPU
ADSL module
Backplane
HDLC controller
G. Link bus
Ethernet processor
ATM/IP transfer module
Fig. 4.2-3 Operating Principles of ATIGN
ATIGN consists of the CPU module, HDLC controller, Ethernet processor, ATM/IP
switching module, and ATSL module. Each module provides the following functions:
1. The CPU module completes the control over boards and the communication
with SCBF;
2. The HDLC module is used to manage HDLC channels.
3. The Ethernet processor implements switching between ports within boards and
provides the G.Link bus responsible for switching and convergence between
ATIGN and other boards in the system.
4. ATM/IP switching module converts ATM protocols into IPs.
5. The ADSL module consists of the filter, line driver, and MAC, and implements
32 channels of ADSL user access.
