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同步數(shù)字系統(tǒng)：synchronous digital hierarchy

國際標準：international standard

信號格式：signal format

網(wǎng)絡節(jié)點接口：network node interface

支路信號：tributary signals

數(shù)字交叉連接：digital cross-connection

網(wǎng)絡管理：network management

網(wǎng)絡維護：network maintenance

網(wǎng)絡運營者：network operators

傳輸速率：transmission rate

支路映射：tributary mapping

靈活性：flexibility

用戶業(yè)務：subscriber services

覆蓋層：overlay levels

制造商：manufacturer

同步傳輸幀：synchronous transmission frame

線路終端復用器：line terminal multiplexer

分插復用器：add-drop multiplexer

再生中繼器：regenerator

靈敏度：sensitivity

虛容器：virtual container

成幀字節(jié)：framing bytes

段開銷：section overhead

端到端傳輸：end-to-end transmission

誤碼監(jiān)視：error monitoring

信號處理節(jié)點：signal processing nodes

凈負荷：payload

指針：pointer

同步傳輸系統(tǒng)：synchronous transmission system

覆蓋NNI 的標準：the standard covering the NNI

國際標準接口：the international standard interface

直接同步復用：direct synchronous multiplexing

靈活的通信聯(lián)網(wǎng)：flexible telecommunication networking

點對點的傳輸技術：point-to-point transmission technology

先進的網(wǎng)絡管理：advanced network management

不同廠家提供的設備：the equipment supplied by different manufacturers

提供的靈活性：the flexibility provided by SDH

同步復用設備的運營者：operator of synchronous multiplexers

電信聯(lián)網(wǎng)：telecommunication networking

支路信號：tributary signals

維護能力：maintenance capabilities

統(tǒng)一的電信網(wǎng)絡基礎結構：unified telecommunication network infrastructure

組件：building blocks

終端復用器：terminal multiplexer

貫通方式：through-mode fashion

同步數(shù)字交叉鏈接：synchronous DXC

可變帶寬：varying bandwidth

各個支路信號：individual tributary signals

傳輸系統(tǒng)：transport system

光載體：optical carrier

二維圖形：2-dimensional map

傳輸次序：the order of transmission