电信专业英英词典C-7

　　Channel

　　A channel is a single communications path in a transmission medium connecting two or more points in a network, each path being separated by some means; e.g., spatial¹ or multiplex separation, such as frequency or time division multiplexing. "Channel" and "circuit" are often used interchangeably, however circuit can also describe a physical configuration² of equipment that provides a network transmission capability³ for multiple channels. The characteristics of channels and circuits are determined⁴ by the network equipment and media used to support them.

　　Channel Service Unit (CSU)

　　Channel Service Units (CSUs) and Data Service Units (DSUs) are required to connect digital customer premises⁵ equipment (CPE) to carrier networks. A CSU is network channel terminating equipment (NCTE) attaching as CPE to telephone company's digital circuits, and protecting the network from harm. Other CSU functions include line conditioning and equalization, error control (e.g., bipolar signal violations), and the logical ability to respond to local and network loop back circuit testing commands. See Data Service Units (DSU).

　　Circuit Associated Signaling

　　Circuit Associated Signaling is a technique that uses the same facility path for voice and signaling traffic. Historically this approach was selected to avoid the costs of separate channels for signaling and because the amount of traffic generated by signaling is small compared to voice, minimizing the chance for mutual⁶ interference. Circuit associated signaling can be contrasted with some common-channel signaling systems that use completely separate packet switched networks for signaling traffic.

　　Circuit Switching

　　Circuit switching is a process that establishes connections on demand and permits the exclusive use of those connections until released. Packet and message switching, primarily used in data communications networks are alternative switching techniques.

　　City Wide Digital Centrex

　　A city wide digital centrex is a capability to serve multiple business locations within a single NXX (exchange code), using multiple LEC central office Centrex switches. Outside callers are unaware⁷ that multiple business locations are involved.

　　CLEC

　　Competitive Local Exchange Carrier, most commonly referred to as Competitive Local Exchange Carrier.

　　CLLI

　　Common Language Location Identifier

　　CMIP

　　common management information protocol⁸

　　Coaxial Cable

　　Coaxial Cable (also called coax⁹ cable or coax) consists of an insulated central conductor surrounded by a second cylindrical¹⁰ conductor that is clad with an insulating sheath. The outer conductor usually consists of copper¹¹ tubing or copper braid.

　　COC

　　central office connections

1 spatial   

adj.空间的，占据空间的

参考例句：

• This part of brain judges the spatial relationship between objects.大脑的这部分判断物体间的空间关系。
• They said that time is the feeling of spatial displacement.他们说时间是空间位移的感觉。

2 configuration   

n.结构，布局，形态，(计算机)配置

参考例句：

• Geographers study the configuration of the mountains.地理学家研究山脉的地形轮廓。
• Prices range from $119 to $199,depending on the particular configuration.价格因具体配置而异，从119美元至199美元不等。

3 capability   

n.能力；才能；(pl)可发展的能力或特性等

参考例句：

• She has the capability to become a very fine actress.她有潜力成为杰出演员。
• Organizing a whole department is beyond his capability.组织整个部门是他能力以外的事。

4 determined   

adj.坚定的；有决心的

参考例句：

• I have determined on going to Tibet after graduation.我已决定毕业后去西藏。
• He determined to view the rooms behind the office.他决定查看一下办公室后面的房间。

5 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。

6 mutual   

adj.相互的，彼此的；共同的，共有的

参考例句：

• We must pull together for mutual interest.我们必须为相互的利益而通力合作。
• Mutual interests tied us together.相互的利害关系把我们联系在一起。

7 unaware   

a.不知道的，未意识到的

参考例句：

• They were unaware that war was near. 他们不知道战争即将爆发。
• I was unaware of the man's presence. 我没有察觉到那人在场。

8 protocol   

n.议定书，草约，会谈记录，外交礼节

参考例句：

• We must observe the correct protocol.我们必须遵守应有的礼仪。
• The statesmen signed a protocol.那些政治家签了议定书。

9 coax   

v.哄诱，劝诱，用诱哄得到，诱取

参考例句：

• I had to coax the information out of him.我得用好话套出他掌握的情况。
• He tried to coax the secret from me.他试图哄骗我说出秘方。

10 cylindrical   

adj.圆筒形的

参考例句：

• huge cylindrical gas tanks 巨大的圆柱形贮气罐
• Beer cans are cylindrical. 啤酒罐子是圆筒形的。

11 copper   

n.铜；铜币；铜器；adj.铜(制)的；(紫)铜色的

参考例句：

• The students are asked to prove the purity of copper.要求学生们检验铜的纯度。
• Copper is a good medium for the conduction of heat and electricity.铜是热和电的良导体。