
Features
--Provides Analog Transmission Line Interface for T1 and E1 Applications --Drop-in Replacement for CS61574 with the Following Enhancements: **Lower Power Consumption
**Transmitter Short-Circuit Current Limiting
**Greater Transmitter Immunity to Line Reflections
**Software Selection Between 75Ω and 120Ω E1 Output Options **Internally Controlled E1 Pulse Width
**B8ZS/HDB3/AMI Encoder/Decoder
General Description
The CS61577 is a drop-in replacement for the CS61574, and combines the complete analog transmit and receive line interface for T1 or E1 applications in a low power, 28-pin device operating from a +5V supply. The CS61577 supports processor-based or standalone operation and interfaces with industry standard T1 and E1 framers.
The receiver uses a digital Delay-Locked-Loop which is continuously calibrated from a crystal reference to provide excellent stability and jitter tolerance. The receiver includes a jitter attenuator optimized for minimum delay in switching and transmission applications. The transmitter provides internal pulse shaping to insure compliance with T1 and E1 pulse template specifications.
Applications
--Interfacing Network Equipment such as DACS and Channel Banks to a DSX-1 Cross Connect
--Building Channel Service Units
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