plesiochronous 中文意思是什麼
plesiochronous
解釋
近乎同步-
Before the 1990s, the digital transmission equipment was based on the technical standards of plesiochronous digital hierarchy ( pdh ). in order to connect the switch to pdh transmission equipment, the switch side needs lots of terminal equipment of the primary rate, i. e., 2048 kbits ( 2m ) switching terminal circuits in compliance with itu - t standards ( e. g. s1240 s dtm trunk module and axe10 s etc module ) and ansi - standard - based 1544 kbits ones
在90年代初期以前，數字傳輸設備是建立在pdh （ plesiochronousdigitalhierarchy ）技術標準上，為了連接交換機到pdh傳輸設備上，在交換機側需要大量的符合基群速率的終端設備，即符合itu - t標準的2048kbits （ 2m ）交換終端電路（如s1240的dtm中繼模塊， axe10的etc模塊）和符合ansi標準的1544kbits交換終端電路等。 -
Pdh plesiochronous digital hierarchy
準同步數字體系 -
Pdh : plesiochronous digital hierarchy
準同步數字系列 -
Plesiochronous digital hierarchy
準同步數字架構 -
Training - based simulation model and algorithm of plesiochronous digital hierarchy fiber communication system
基於訓練的準同步數字系列光纖通信系統模擬模型與演算法 -
The sdh ( synchronous digital hierarchy ) is originally developed from the pdh ( plesiochronous digital hierarchy )
它是目前光纖通信系統中應用最廣泛的數字傳輸體制。 -
Sdh ( synchronous digital hierarchy ) has some primary advantages such as synchronous multiplexing, standard optical interface and strong network management compared with pdh ( plesiochronous digital hierarchy )
同步數字體制（ sdh ）與傳統的偽同步數字體制（ pdh ）相比，有三大核心優勢，即同步復用、標準光介面和強大的網管能力。
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