![电话交换机之间的连接方式](data:image/png;base64,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)
| 发布日期:[2011-10-22] 共阅[1043]次 | | 世界上最稀有的跑车 一、最常用的两台程控电话交换机之间通信接入方案
此方案是把两台集团电话交换机的分机线与中继线相互对接,即一台电话交换机A的分机线接入另一台电话交换机B的中继线,另一台电话交换机B的分机线接入这台电话交换机A的中继线,相
互交叉接入。
此方案必须具备:两台集团电话交换机要有多余的分机端口和中继端口线(一般是2-4条线),两台电话交换机同时相互之间拨打取决于相互之间接了多少条分机线或中继线.
常用的两台电话交换机接入对接方案如图:
例如:
电话交换机楼上A的""分机线是8014,8015接入到楼下B的""中继板"端号是第03、04上,而电话交换机楼下B的""分机号码是622,623接入到楼上A的""中继板"端号是第03、经典对联大全04;楼上A拨打B
,出局设为""9"', 楼上B拨打A,出局设为""6"',;两台电话交换机设为间接局。
电话交换机A拨打B:杭州西湖的资料 先拨9,再拨B交换机的分机号码,
电话交换机B拨打A: 先拨6,再拨A交换机的分机号码.
二、典型数字程控用户交换机对接通信接入方案(两台交换机用E1数字中继接入,实现两合一)
该方案条件是必须两台是数字程控交换机,需配E1数字中继(PCM 2信令),将在数字程控交换机A上的E1数字中继(PCM 2M信令),通过75Q同轴电缆线连结方式(或远距离通过光端机由
光纤连结方式)到数字程控交换机B的E1数字中继上;这种方式是数字E1对接方式,两台数字交换机之间可以同时30路用户通话。
该方案连结方式说明:一种采用同轴电缆直接就可以连结只能在100米内。另一种是两台数字程控用户交换机相隔距离远,采用光纤连结的方式,通过光端机实现两台数字程控交换机E1对
接。
该方案互相对接拨打方法:两台数字交换机可以直接拨号,设不同的字头来分。如:A台为8000-8100,B台为7000-7888,A台拨B台数字交换机方法是: 分机提机直接拨7000,就可以了。
三、不采用两台程控交换机对接改为一台程控电话交换机,加光综合传输复用器方式
采用集团电话交换机或数字程控交换机+光综合复用设备组成. 利用话路复用器可以使一个集团公司或一个系统单位共用一台程控用户交换机,不仅便于管理和维护,而且还可以降低成本
,电信运营商可以作为远端模块使用。
用光缆传输而不需要通信电缆,话路复用器也可利用n*64K的传输方式一部分传语音,一部分传以太网数据或其它业务,并且直接同具有中国一号信令、中国七号信令或PRI信令的E1接口
相连接,实现2M的远端接入。特别适用于有光缆铺设而无电缆铺设,或语音需要保密(如部队)的场合。
两台程控电话交换机接入方案说明:(只要有网线)
有IP网络接入的地方,不管是VPN专网还是因特网,都可以多种方式组建VoIP电话系统,相互间免费(视频)通话。
基于IP网络多种接入方式解决两台交换机通话:
分支机构各自部署IPPBX融合平台系统,通过SIP中继组网;支付宝支付密码忘了怎么办
IAD远程接入到总部服务器
SIP话机、PCA软件远程注册到总部服务器;
出入中继共享,统一企业号码
全网电话统一编号,短号直拨,免费通话
全网系统通信录智能同步,所有分机自动获取
异地分机、软件终端(CM-IMS,ZOIPER,X-lite等)享受总部分机相同业务功能
两台集团电话交换机组网对接 四大美女是谁两台电话交换机组网对接 两台程控交换机组网对接
集团电话光纤对接 电话交换机光纤组网 二手房购房合同程控交换机对接 数字交换机E1光纤对接组网 | |
|
|
版权声明:本站内容均来自互联网,仅供演示用,请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198,我们将在24小时内删除。
发表评论