电信专业英英词典I-1

 

　　I-MAC

　　isonchronous media access controller

　　IDN

　　integrated digital network

　　IEC

　　International Electrotechnical Commission

　　Impairments

　　Impairments is the (e.g., transmission channel and signal impairments) degradation¹ caused by practical limitations of channels, (e.g., signal level loss or attenuation², echo, various types of signal distortion, etc.) or interference induced from outside the channel (such as power-line hum or interference from heavy electrical machinery). The measurement of transmission impairments is an important aspect of predicting whether or not telecommunications systems will sustain the business applications they are intended to support. Signal-to-noise ratio, percent distortion, frequency response, and echo are measurements that define impairments most noticeable by users in analog³ voice systems.

　　Inbound Signaling

　　Inbound signaling uses not only the same channel path as the voice traffic, but the same frequency range (band) used for the voice traffic.

　　Independent Telephone Company (ITC)

　　ITC is a local exchange carrier that is not one of the 22 divested⁴ Bell-operating companies. ITCs are not generally subject to the restrictions⁵ of the MFJ, although some of the larger ones are bound by separate consent decrees. Southern New England Telephone and Cincinnati Bell are generally considered ITCs from a regulatory point of view.

　　Integrated Services Digital Network (ISDN)

　　ISDN consists of a set of standards being developed by the CCITT and various U.S. standards setting organizations. The CCITT formal recommendations, adopted in October, 1984, first defined ISDN as ". . . a network, in general evolving from a telephony integrated digital network, that provides end-to-end digital connectivity to support a wide range of services, including voice and non-voice, to which users will have access by a limited set of standard multipurpose user- network interfaces⁶." The concept of user access to an existing integrated digital network (IDN) underlies⁷ the ISDN.

　　Inter-LATA Services

　　Inter-LATA services are revenues, functions, etc., that relate to telecommunications originating in one LATA and terminating outside that LATA. An interexchange carrier (IXC) is a company which provides telecommunications services between LATAs. (the domain⁸ of IXCs).

　　Intermediate Cross Connects

　　In a premises⁹ distribution system, intermediate cross connects are cross-connects located telecommunications closets.

1 degradation   

n.降级；低落；退化；陵削；降解；衰变

参考例句：

• There are serious problems of land degradation in some arid zones.在一些干旱地带存在严重的土地退化问题。
• Gambling is always coupled with degradation.赌博总是与堕落相联系。

2 attenuation   

n.变薄；弄细；稀薄化；减少

参考例句：

• The attenuation distance and transmittance are connected together, they influence each other. 衰减距离attenuation)和能见度(transmittance)是联系在一起的，并相互影响。 来自互联网
• Attenuation of light is in the form of absorption. 光是以吸收的形式衰减。 来自辞典例句

3 analog   

n.类似物，模拟

参考例句：

• The analog signal contains high-frequency video information,which helps make up the picture.模拟信号包括有助于构成图像的高频视频信息。
• The analog computer measures continuously,without proceeding step by step.模拟计算机不是一步一步地进行，而是连续地进行量度。

4 divested   

v.剥夺( divest的过去式和过去分词 )；脱去（衣服）；2。从…取去…；1。（给某人）脱衣服

参考例句：

• He divested himself of his jacket. 他脱去了短上衣。
• He swiftly divested himself of his clothes. 他迅速脱掉衣服。 来自《简明英汉词典》

5 restrictions   

约束( restriction的名词复数 )； 管制； 制约因素； 带限制性的条件（或规则）

参考例句：

• I found the restrictions irksome. 我对那些限制感到很烦。
• a snaggle of restrictions 杂乱无章的种种限制

6 interfaces   

界面( interface的名词复数 )； 接口（连接两装置的电路，可使数据从一种代码转换成另一种代码）； 交界； 联系

参考例句：

• If the class needs to be reprogrammed, new interfaces are created. 如果class需要重新程序设计，新的interfaces创建。
• Interfaces solve this problem of evolving code. Interfaces解决了代码升级的问题。

7 underlies   

v.位于或存在于（某物）之下( underlie的第三人称单数 )；构成…的基础（或起因），引起

参考例句：

• I think a lack of confidence underlies his manner. 我认为他表现出的态度是因为他缺乏信心。 来自《简明英汉词典》
• Try to figure out what feeling underlies your anger. 努力找出你的愤怒之下潜藏的情感。 来自辞典例句

8 domain   

n.(活动等)领域，范围；领地，势力范围

参考例句：

• This information should be in the public domain.这一消息应该为公众所知。
• This question comes into the domain of philosophy.这一问题属于哲学范畴。

9 premises   

n.建筑物，房屋

参考例句：

• According to the rules,no alcohol can be consumed on the premises.按照规定，场内不准饮酒。
• All repairs are done on the premises and not put out.全部修缮都在家里进行，不用送到外面去做。