中国联通 China Unicom
中国移动China Mobile
网络容量 network capacity
交换容量exchange capacity
扩容Capacity Expansion
平滑升级smooth upgrade
工作频率Radio Frequencies
接收灵敏度Receive Sensitivity:
数据Data Options
传输速率Data Rate
电源部分Power supply
数据接口Data Interface
天线接口Antenna Interface
传输速率Baud Rate
用户交互界面Ur Interface
认证Certifications
网络数据传输数率 net data transfer rate
联通无限U-Max
旗下subordinate
品牌 trademark
U-Info 互动视界
U-Magic 神奇宝典
U-Net 掌中宽带
U-Mail 彩e
U-Map 定位之星
U-Sms 联通在信
应解放长春
用服务Application Service
产业价值链industrial Value chain
战略目标strategic objective
渠道channel
转型transition/Transformation
推广extension
针对aim at
电信telecommunication
整合conformity
市场渗透率 market penetration factor
微观的microcosmic
科学技术science and technology
地理环境geographic environment
宏观的macroscopical
供应链supply chain
产品种类product variety
价格水平price level
销售方式modes of sale
1.PCM原理
抽样量化与编码:sampling,quantizing and coding
话路:speech channel幅值: amplitude value
抽样频率: sampling frequency
抽样速率: sampling rate脉冲流: stream of puls
重复率: repetition rate 编码过程: coding process&n我怀念
bsp;
模拟信号: analog signal
传输质量: transmission quality
数字通信: digital communication
数字传输: digital transmission
含噪声的环境: noisy environment
传输路由: transmission path
信噪比 :signal-to-noi ratio
信号电平 :signal levels噪声功率: noi power
地面系统: terrestrial system
二进制传输: binary transmission
反向操作: rever operation
8-位码序列: 8-digit quence
接受端: receiving terminal 帧格式 :frame format
同步字 :synchronization word
实现这三项功能的方案 :the schemes for performing the three functions
一串幅值: a ries of amplitude values
电话质量的话路 a speech channel of telephone quality
一个8位二进制码的序列: a quence of 8-binary digits
理论上的最小抽样频率 :a minimum theoretical sampling frequency
占据着300Hz到3.4kHz频率范围的话路: a voice channel occupying the range 300Hz to 3.4kHz
每个样值8-位码: 8-digits per sample value
汽车点火系统的打火: the sparking of a car ignition system
重复率为64kHz的脉冲流: the stream of the puls with a repetition rate of 64kHz
真实信号与噪声信号的关系: relationship of the true signal to the noi signal
由卫星上接受到的信号 :the signal received from a satellite
一条特定消息中的全部信息 :the complete informatian about a particular message
被传信号的波形 :the shape of the transmitted signal
由传输路由引入的衰减: the attenuation introduced by transmission path
将抽样的幅值转换成一串脉冲的单元 :the unit that converts sampled amplitude value to a t of puls
涉及到第一路，第二路及其他各路的序列: a quence relating to channel 1,2 and so on
被称为同步字的独特码序列: a unique quence of puls called synchronization word
地面系统 :terrestrial system
脉冲的“有”或“无” : the prence or abnce of the puls
高速的电子开关: a high-speed electronic switch
时分多路复用器 :the time division multiplexer
时分多路复用 :Time Division Multiplexer
2.异步串行数据传输
串行接口 rial interface
显示终端 CRT terminal
发送器与接收器 transmitter and receiver
数据传输 data transmission
数据流 data stream
闲置状态 the idle state
传号电平 mark level
空号电位 space level
起始位 start bit
停止位 stop bit
T秒的持续时间 duration of T conds
奇偶校检位 parity bit
错误标志 error flag
传输错误 transmission error
下降沿 fallinf edge
符号间的空格 intersymbol space
接收机的定时 receiver timing
本地时钟 local clock
磁带 magnetic tape
控制比特 control bit
逻辑1电平 logical 1 level
二进制数据 binary data
明显的缺点 obvious disadvantage
异步串行数据传输 asynchronous rial data transmission
最为流行的串行接口 the most popular rial interface
所传送的数据 the transmitted data
发送器与接收器的时钟 the clocks at the transmitter and receiver
电传机的时代 the era of teleprinter
一个字符的点和划 the dots and dashs of a character
符号间空格持续时间的三倍 three times the duration of intersymbol space
被称为字符的比特组 the group of bits called characters
由7或8个比特的信息组成的固定单元 the invariable units comprising 7 or 8 bits of information
由接收机本地产生的时钟 a clock generated locally by the receiver
在字符后所收到的奇偶校检位 the received parity bit following the character
起始位的下降沿 the falling edge of the start bit
数据链路面向字符的特性 the character-oriented nature of the data link
3.数据通信
地下电缆 underground cable
通信卫星 communication satellite
微波设备 microwave facilities
调制器与解调器 modulator and demodulator
缓冲器 buffer
定时信号 timing signals
同步脉冲 synchronization puls
时隙 time slot
移位寄存器 shift register
传输媒体 transmission medium
线形衰弱 linear attenuation
信息安全 information curity
键盘 keyboard
数据终端 data terminals
某种类型的数据转换设备 some type of data conversion equipment
视频显示终端 visual display terminal
称为数据调制解调器的双向数据发送接收机 two-way data transmistter-receiver called a data modem
全双工的数据传输系统 full-duplex data trandmission system
