数字交换 [计] digital switching ; DS DigitalSwitching ; [计] digit switching ; PCM-SWITCH

程控数字交换 Program Controling of Digital Exchange ; program control digital switching

数字交换机 Digital Switch ; digital exchange ; DXT

交换数字广播 SDB Switched Digital Data Interconnect ; erconnect

数字电话交换局 digital telephone exchange ; digital telcphone switching system

数字电话交换机 Digital Telephone Exchange TXD

数字程控交换机 Digital SPC Switch ; PBX-D

数字交换系统 Digital Switched System ; digital exchange system

数字交换网络 DSN ; digital switch network