YTD428_07 YAMAHA [YAMAHA CORPORATION], YTD428_07 Datasheet - Page 15

• Manufacturer Part Number: YTD428_07
• Description: IDSU ISDN DSU for Terminal Equipment
• Manufacturer: YAMAHA [YAMAHA CORPORATION]

4. DETAILS OF FUNCTIONS
4.1 U Reference Point Section
This block amplifies the receive signal amplitude to the maximum dynamic range.
This block makes an A/D conversion of the received signal and transfers it to the line termination block.
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
The following functions provide the necessary functions for TTC Standard JT-G961 (TCM operation) and the
NT function described in TTC Standard JT-I430.
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.
Variable Amplifier
ADC
Peak Hold
Circuit Termination Block
Line Termination Block
Rate adaptation and frame assembly / disassembly at the U and T reference points
State transition control
U reference point drive control
T reference point receive timing control
Loopback control
YTD428 supports loopback 2 and loopback C for testing and maintenance.
These loopback tests are under local switch control.