Sr People

In: Business and Management

Submitted By eagleyes125
Words 1718
Pages 7
电信基础知识题库
(以下题目可以按填空、判断或简答方式出题,也可以经过变化成为选择题)
1、语音信号数字化过程中,采用的是的量化方法是非均匀量化。
2、PCM30/32路系统中,每个码的时间间隔是488ns 。
3、PCM30/32路系统中,TS0用于传送帧同步信号,TS16用于传送话路信令。
4、PCM30/32路系统中,复帧的重复频率为500HZ,周期为2ms。
5、程控交换机的硬件可分为话路系统和中央控制系统两部分,整个交换机的控制软件都放在控制系统的存储器中。
6、一般二氧化硅光纤的零色散波长在1310nm左右,而损耗最小点在1550nm波长左右。
7、G.652光纤是零色散波长在1310nm的单模光纤。
8、光缆的基本结构由缆芯、加强元件和护套组成。
9、常用的光缆结构形式有层绞式光缆、束管式光缆、骨架式光缆和带状式光缆。
10、在网状网的拓扑结构中,N个节点完全互连需要N(N-1)/2 条传输线路。
11、在星型网的拓扑结构中,N个节点完全互连需要N-1 条传输线路。
12、ATM技术是电路交换技术和分组交换技术的结合。
13、根据98年发布的《自动交换电话(数字)网技术体制》,我国电话网分为三级。
14、根据新的电话网体制,我国长途电话网分为二级。
15、当电话网全网为三级时,两端局之间最大的串接电路段数为5段,串接交换中心最多为6个。
16、新体制中一级长途交换中心(DC1)为省(自治区、直辖市)长途交换中心,其职能主要是汇接所在省(自治区、直辖市)的省际长途来去话务和一级交换中心所在地的长途终端话务。
17、一级长途交换中心(DC1)之间以基干路由网状相连。
18、根据话务流量流向,二级长途交换中心(DC2)也可与非从属的一级长途交换中心DC1建立直达电路群。
19、一级长途交换中心DC1可以具有二级长途交换中心的职能。
20、本地网路由的选择顺序为:直达路由、迂回路由、最终路由。
21、数字本地网中,原则上端至端的最大串接电路数不超过3段。
22、根据CCITT的建议,国内有效号码的长度不超过12位,国际有效号码长度不超过15位。
23、我国电话网目前采用的编号方式为不等位编号。
24、No.7信令中,消息传递部分由低到高依次包括信令数据链路、信令链路功能和信令网功能三个功能级。
25、国内No.7信令网采用由HSTP、LSTP和SP组成的三级信令网。
26、常见的同步基准信号有2048Kbits/s 和2048KHz。
27、我国的No.7信令网为三级网络结构。
28、我国No.7信令网中,第一级HSTP间采用A、B平面连接方式,A、B平面内部各个HSTP网状相连,A和B平面成对的HSTP相连。
29、每个LSTP通过信令链至少要分别连接至A、B平面内成对的HSTP。
30、LSTP至A、B平面两个HSTP的信令链路组之间采用负荷分担方式工作。
31、每个SP至少连至两个STP。
32、SP至两个STP的信令链路应采用负荷分担方式工作。
33、两个信令点间的话务群足够大时,可设置直达信令链,采用直联方式。
34、我国信令网分为33个主信令区。
35、我国国内的信令点编码为24位。
36、直拨PABX应分配给信令点编码。
37、信令数据链路的传输速率为2048Kbits/s。
38、STP设备的基本进网要求规定,独立型STP信令链路数量不小于512条链路。
39、STP设备的基本进网要求规定,独立型STP信令处理能力不小于80000MSU/s。
40、STP设备的基本进网要求规定,独立型STP信令链路组数量不小于256。
41、STP设备的基本进网要求规定,独立型STP路由区不小于1024。
42、STP设备的基本进网要求规定,综合型STP信令处理能力不小于10000MSU/s ,最大信令链路数量不小于128。
43、信令路由的选择规则是首先选择正常路由,当正常路由故障不能使用时,再选择替换路由。
44、高效直达电路群上的话务可溢出到其他电路群上去,低呼损直达电路群上的话务不允许溢出到其他电路群上去。
45、本地网为网状网结构时,所有端局与长途局间必须设置基干电路群,所有端局间必须设置低呼损直达电路群。
46、本地网为集中汇接方式时,所有端局与长途局间必须设置基干电路群,所有端局和汇接局之间必须设置低呼损直达电路群。话务量大的两端局之间可设置直达电路(高效或低呼损)。汇接局和长途局之间可设置低呼损直达电路群。…...

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