YTD428 데이터 시트보기 (PDF) - Yamaha Corporation

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YTD428

IDSU ISDN DSU for Terminal Equipment

Yamaha Corporation 

DETAILS OF FUNCTIONS

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4. DETAILS OF FUNCTIONS

4.1 U Reference Point Section

s Variable Amplifier

This block amplifies the receive signal amplitude to the maximum dynamic range.

s ADC

This block makes an A/D conversion of the received signal and transfers it to the line termination block.

s Peak Hold

This block is performed during the initial training so that the gain of the Variable amplifier block is set to

make best communication condition.

4.2 Circuit Termination / Line Termination Section

s Circuit Termination Block

The following functions provide the necessary functions for TTC Standard JT-G961 (TCM operation) and the

NT function described in TTC Standard JT-I430.

q Rate adaptation and frame assembly / disassembly at the U and T reference points

q State transition control

q U reference point drive control

q T reference point receive timing control

q Loopback control

YTD428 supports loopback 2 and loopback C for testing and maintenance.

These loopback tests are under local switch control.

s Line Termination Block

The line termination provides the f equalization which compensates the DLL (Digital Local Line) loss and the

amplitude distortion, and the BT equalization which compensates the waveform distortion caused by the

bridged tap.

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