The Primary Rate Access Clock Generator and Transceiver PRACT (PEB 22320) is a monolithic CMOS device which implements the analog receive and transmit line interface functions to primary rate PCM carriers. It may be programmed or hard wired to operate in 1.544-Mbit/s (T1) or 2.048-Mbit/s (CEPT) carrier systems.

特性 Features

? ISDN line interface for 1544 and 2048 kbit/s (T1 and CEPT)

? Data and clock recovery

? Transparent to ternary codes

? Low transmitter output impedance for a high return loss with reasonable protection resistors (CCITT G.703 requirements for the line input return loss fulfilled)

? Adaptively controlled receiver threshold

? Programmable pulse shape for T1 applications

? Jitter specifications of CCITT I.431 and BELLCORE TR-NWT-000499 publications met

? Wander and jitter attenuation

? Jitter tolerance of receiver: 0.5 UI s

? Implements local and remote loops for diagnostic purposes

? Monolithic line driver for a minimum of external components

? Low power, reliable CMOS technology

? Loss of signal indication for receiver

? Clock generator for system clocks