Functional Overview
The VSC9111 is a SONET/SDH transport overhead terminating transceiver. It may be used as an interface between four STS-12/STM-4 data streams or sixteen STS-3/STM-1 data streams and a single STS-48 data stream. It also supports transport overhead processing for STS-48c data streams. When used in conjunction with a high-speed MUX/DEMUX transceiver, this device provides a complete solution for migrating from STS-12/ STS-3 to STS-48 interfaces in SONET/SDH/ATM multiplexers and terminals. The basic features of the receive and transmit datapaths and features of other interfaces are listed below.

FEATUREs
• Integrated SONET/SDH Transport Overhead Terminating Transceiver for use in STS-48/ STM-16 Applications
• Performs Byte Interleaved Multiplexing of STS-12/STM-4 and STS-3/STM-1 SONET/ SDH Drop Side Data Streams
• Supports STS-48c/STM-4-16c Operation
• 16 bit PECL Interface to High-speed MUX/ DEMUX Transceivers
• Generic 8-bit Microprocessor Interface
• Prepared for STS-192/STM-64 Applications
• +3.3V Power Supply
• +5V Tolerant TTL I/O
• Compliant with SONET and SDH Requirements as Stated in ANSI T1.105, Bellcore GR-253-CORE and ITU-T G.707 Documents
• 0.35 Micron CMOS Technology
• Provides JTAG TAP Controller Conforming to the IEEE 1149.1 Standard
• Thermally Enhanced 352 BGA Package