Introduction - Motorola BSR 64000 Reference Manual

POS Commands

Introduction

The Synchronous Optical Network (SONET) standard provides for data transmission
over fiber optic cable and high-bandwidth utilization and efficiency over Internet
links. The SONET standard defines industry interface standards at the physical layer
of the OSI seven-layer model. This standard defines a hierarchy of interface rates that
allow data streams at different rates to be multiplexed. SONET establishes Optical
Carrier (OC) levels from 51.8 Mbps to 2.48 Gbps. Prior rate standards used by
different countries specified rates that were not compatible for multiplexing.
Synchronous Digital Hierarchy (SDH), the international equivalent of SONET,
defines a standard rate of transmission at 155.52 Mbps. With the implementation of
SONET/SDH, communication carriers throughout the world can interconnect existing
digital carrier and fiber optic systems.
15-1