Specifications

Chapter 1 Introduction Installation and Operation Manual
1-6 Functional Description ASMi-31 Ver. 3.0
1.3 Functional Description
This section contains functional descriptions of the ASMi-31 circuit blocks, shown
in
Figure 1-3 .
PLL
CPU
68032
Data & Add Bus
External Clock
Master
Clock
Digital
Interface
LCD
Line
Power
Overvoltage
Protection
Power
Supply
Hybrid Echo
Cancellation
Memory
PEB - 2070
IOM-2
U-Interface
Data
Data
LCD LEDs
BERT
Figure 1-3. ASMi-31 Block Diagram
• Digital interface – An interchangeable module which translates the received
and transmitted data from TTL levels to any combination of DTE interfaces
supported by the modem.
• CPU MC68302 – This processor handles the following functions:
 Derive command information from and to management channel via
D-channel to change the status and the configuration of the remote unit
(ASMi-31).
 Handle the serial bus protocol for the U-interface.
 Monitor and command.
 Activate and deactivate alarms and diagnostics signals.
 Receive data incoming from the DTE interface, either encapsulated or
rate adapted (for rates lower than 64 kbps), and send the data by serial
bus to the U-interface. Compute the same in the reverse direction.
 Drive LEDs to indicate status and failure conditions.
 Read and carry out command signals arriving from the DTE interface.