本文档介绍了采用DS3传输的电视传输服务信道的性能特征。性能参数表示为传输服务信道端点之间的单个编码和解码。适当时，提供性能定义和测量方法。提供电气接口定义是为了促进最终用户、服务提供商和运营商之间的兼容性。

This document addresses the performance characteristics of television transmission service channels employing DS3 transport. The performance parameters are expressed for a single encoding and decoding between the end points of a transmission service channel. Performance definitions and measurement methods are provided where appropriate. Electrical interface definitions are provided to facilitate compatibility between end users, service providers, and carriers.