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CY7C955 Datasheet AX ATM-SONET/SDH Transceiver

Manufacturer: Cypress (now Infineon)

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General Description

The Cypress Semiconductor CY7C955 is a Transceiver chip designed to carry ATM cells across SONET/SDH systems.

On the transmit side, ATM cells coming from the Utopia interface are being mapped into SONET/SDH frames and then serialized for transmission over fiber or twisted pair (through an optical module or an equalizer chip).

On the receive side, serial SONET/SDH datastreams coming from an optical module or an equalizer chip are being recovered by the intergrated clock and data recovery phase-locked loop, framed, processed, and presented as parallel ATM cells on the Receive Utopia Interface.

Overview

PRELIMINARY CY7C955 AX™ ATM-SONET/SDH Transceiver.

Key Features

  • WAN and LAN ATM physical layer device.
  • Provides complete physical layer transport of ATM cells at:.
  • STS.
  • 3c/ STM.
  • 1 rate of 155.52 MHz.
  • STS.
  • 1 rate of 51.84 MHz.
  • Compliant with ATM Forum User Network Interface 3.1 specification.
  • UTOPIA ATM interface.
  • ATM cell processing including:.
  • HEC generation/verification.
  • Cell scrambling/descrambling.
  • Rate adaption/idle cell filtering.
  • L.

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