Functional Overview
The VSC9142 is a dual mode SONET/SDH to Packet/ATM framing device that integrates the physical layer components of 2.5 Gbps clock and data recovery and serialization/deserialization into a single device. In the Packet over SONET (POS) mode, this device can be used in equipment interconnecting IP/PPP/HDLC data over public or private SONET/SDH networks. Similarly, in the ATM over SONET (ATM) mode, this device can be used in equipment interconnecting ATM switches. In addition, the VSC9142 can be used in various applications involving LAPS (X.85/Y.1321) and Ethernet over SONET/SDH protocols.

FEATUREs
• Dual Mode STS-48c/STM-16c to Packet/ATM Framing Device for User Network Interface and Network Node Interface Applications
• Integrated 2.5 Gbps Clock and Data Recovery and Serial Clock and Data Output with Power-Down Feature
• Selectable Reference Clock Frequencies and Sources for Transmit and Receive datapaths
• Terminates and Generates Full SONET/SDH Section, Line, and Path Layers
• Dedictated Ports for Section/Line Overhead Access (Extraction/Insertion)
• Extensive SONET/Packet/Cell Performance Monitoring Features
• Programmable Packet/Cell Filtering and Discarding Functionalities
• Industry Compliant Drop Side Packet/Cell Interface for Single-PHY Applications
• 4-bit OIF Compliant Line Interface to be usedfor STS-192 applications
• +1.8V and +3.3V Power Supplies
• Compliant with SONET and SDH Requirements as Stated in ANSI T1.105, Bellcore GR-253-CORE and ITU-T G.707 Documents
• Compliant with PPP in HDLC-like Framing and Mapping into SONET/SDH as Defined in IETF RDFC 1619/1661/1662/2615