Besides , the 2 mbits paths of different trunks are totally carried by digital cross connection ( dxc41 cross connect system ) . all this contributes to the reduced workload and investment , expedited installation and simplified capacity expansion and maintenance 同时传输网减少了大量的下2mbits支路的复用设备，各局向的2mbits通路的交叉连接全部由数字交叉（即dxc41交叉机）承载。
The simultaneous transmission or processing the individual parts of a whole , such as the bits of a character or the characters of a word . when characters are dealt with simultaneously ( not one after another ) , the transmission is serial by character and parallel by bit 指一个整体的各部分(一个字符的各位,一个字的各字符)同时传输或同时进行处理,当字符同时(而不是一个接一个地)处理时,则是按字符来串行、按字符的各位来并行地进行传输。
To boost the development of broadband access , beijing telecom has launched its adsl service to transmit voice and data signals on one twisted pair . as a rate asymmetric copper line access technology , adsl enables an uplink rate of 640kbps and a downlink rate of 1 . 5 to 8mbps on one subscriber line Adsl是一种新的在一对双绞线上同时传输电话业务与数据信号的技术，它属于速率非对称型铜线接入网技术，并且可以在一对用户线上进行上行640kbits 、下行达1
Wavelength division multiplexing ( wdm ) is a promising approach that can use the enormous bandwidth of the optical fiber . a single fiber can be employed for multiple data streams simultaneously . all - optical networks employing the concept of wdm are considered as the transport networks for the future 波分复用技术( wdm )允许在一根光纤中同时传输若干路不同波长的光信号,具有实现简单和易于扩展的特点,是目前充分利用光纤容量的方法中最具吸引力的候选者。
Through this local system , manager can access to the higher level of governmental network system about safety production information . this local system also makes it possible to simultaneously transmit video / audio signals and collect data information through the same hardware device . in addition to its other functions , this system contains a management center that creatively introduced some advanced function model such as the call center , rescue plan for the emergency accidents 本文充分结合安全生产领域的特定要求，对分布式数字监控系统在安全生产管理中的应用进行了深入研究，首次提出把政府安全生产监督管理功能与企业安全生产监控系统相集成，构建了市(县)级安全生产管理系统，形成覆盖全市(县)的安全生产监控管理数字网络系统；并可进入更上层的政府安全生产信息网络系统；同时实现了通过同一硬件装置同时传输视频音频及实时采集的数据信息：在管理中心还创造性地引入了呼叫举报中心、应急救援决策中心，使该系统能够切实为安全生产管理部门服务。
There ’ re some shortcomings in the past audio system . firstly , audio channel is connected with an audio cable ; secondly , the installation in multi - room or long distance environment is complex ; thirdly , extra hardware and cable is needed in the management and monitoring of the audio content ; lastly , the audio routing is manually operated or by expensive audio routers , also , the reconfiguration of the audio system is complicated and time - consuming . in comparison with the past audio system , audio and control data can coexist in cat - 5 cable using etheraudio router ; the devices can be separatedly monitored through the ethernet ; audio can be transmitted to single destination or different destination ; audio routing can be easily finished by modifying address 传统的音频系统中,音频轨道都要与一条音频电缆相连;多房间、长距离安装复杂;音频内容的管理和监控都需要附加硬件设备和电缆;音频路由需要人工接线或昂贵的音频路由器,系统的重新配置也是复杂而耗时的过程。 etheraudio音频路由器可以利用5类线同时传输音频和控制数据;音频设备可以通过以太网独立监控;音频数据可以传输到单个或多个目的地;音频路由可以通过更改地址信息轻易地完成。
Mobile communication technology has been gained flourish development last several tens year , it has been developed from the first generation simulation communication system manifested by audio transferring to the second generation gsm digital communication system and gprs data t system manifested by data and audio transferring simultaneously and to the third generation mobile communication system 移动通信技术近几十年来蓬勃发展，已由第一代以语音为主的模拟通信系统发展到第二代gsm数字通信系统和正兴起可同时传输数据与语音的gprs数据传输系统以及第三代移动通信系统。
But with the high - speed development of tele - medical life signal monitoring technology , many problems emerged , such as no compatibility caused by nonstandard format ; incorrect diagnoses caused by data losing and delay ; incapable of transmitting different kinds of life signal at the same time ; the demand of transfer , etc . consequently , in order to enhance the efficiency and quality of life signal monitoring further , some proprietary regulation must be set down 但在远程生命信号监测技术高速发展的同时,也暴露出一些问题,比如格式不规范导致的不兼容,数据延迟或丢失引起的错误诊断,无法同时传输多种类型的生命信号,病人需要一定的移动性,等等。因此,要进一步提高生命信号监测的效率和质量,就必须制定一些专有规则。
This network fire fighting broadcasting system can use existing network resource availably and implement the speech communication in the networking buildings in the garden area . it can implement the broadcasting to various buildings at the same time , and it also can implement the broadcasting with multichannel different speech data . the speech data may be the audio files or the microphone input speech 本网络消防广播系统能够有效的利用现有的网络资源,实现对园区内联网大楼的语音传输,能实现同时对各大楼的广播,且能实现在系统中同时传输多路不同的音频码流,音源可以是音频文件或麦克风语音输入。
In view of drive - response chua ' s circuit chaotic synchronization system , chaos synchronization self - maintenance is put forward in this thesis , it solves the present problem of how to stimulatingly transmit useful signal and chaos synchronization control signal in the same one channel , as a result , it establishes the groundwork of putting chaos into practical application of engineering and communication field 本文针对驱动?响应式chua电路混沌同步系统，提出混沌同步系统的自保持特性，解决了目前在混沌保密通信中，如何在同一信道中同时传输明文信息和混沌同步控制信号，为混沌同步在工程、通信领域的实际应用奠定了基础。
