通信工程专业英语课文翻译

Technology of Modern Communication

Text A: Bluetooth

Bluetooth wireless technology is a short-range communications technology intended

to replace the cables connecting portable（轻便的） and fixed devices while

maintaining high levels of key features of Bluetooth technology are robustness（稳健）, low power, and low cost .The Bluetooth specification defines a uniform

structure for a wide range of devices to connect and communicate with each other.

蓝牙无线技术是一种小范围无线通信技术，旨在保持高安全级的基础上，在便携式设备与固定设备之间实现无线连接。蓝牙技术的主要特点是稳健，低功耗和低成本。蓝牙规范定义了一个统一的结构，适用范围广的设备连接并相互沟通。

Bluetooth technology has achieved global acceptance such that any Bluetooth enable

device, almost everywhere in the world, can connect to other Bluetooth enabled

devices in proximity. Bluetooth enabled electronic devices connect and communicate

wirelessly through short-range, ad hoc（特别） networks known as piconets Each device

can simultaneously communicate with up to seven other devices within a single piconet.

Each device can also belong to several piconets simultaneously. Piconets are

established dynamically and automatically as Bluetooth enabled devices enter and

leave radio proximity.

蓝牙技术已取得全球认可，使得任何支持蓝牙的设备，几乎在世界各地，可以连接到其他支持蓝牙的邻近装置。蓝牙功能的电子设备连接并通过短距离无线通信，特别网络，被称为微微网。每个设备可以同时在一个单一的微微网最多七个其他设备进行通信。每个设备也可以同时属于几个微微网。微网是动态和自动建立蓝牙功能的设备进入和离开无线电近炸。

A fundamental Bluetooth wireless technology strength is the ability to

simultaneously handle both data and voice transmissions .This enables users to enjoy

variety of innovative solutions such as a hands-free headset （耳机）for voice calls,

printing and fax capabilities, and synchronizing PDA , laptop, and mobile phone

applications to name a few.

一个基本的蓝牙无线技术的力量是同时处理数据和语音传输的能力，这使得用户可以享受各种创新的解决方案，如免提耳机进行语音通话，打印和传真功能，并同步PDA，笔记本电脑，以及手机应用仅举几例。

Core system

The Bluetooth core system, defined by Bluetooth specification, is a common service

layer protocol which covers four lower layers in seven layer protocol. Service

Discovery Protocol (SDP) and the overall profile requirements are defined by Generic Access Profile (GAP) A complete Bluetooth application requires a number of

additional services and higher layer protocols that are defined in the Bluetooth

specification

核心系统

蓝牙核心系统，通过蓝牙规范中定义的，是一种常见的服务层协议，它包括在7层协议四个较低层。服务发现协议（SDP）和整体轮廓的要求是由通用访问模式（GAP）定义一个完整的蓝牙应用程序需要的一定数量的在蓝牙规范中定义额外的服务和更高层协议。

The lowest three layers are sometimes grouped into a subsystem known as the Bluetooth

controller（蓝牙控制器）. This is a common implementation involving a standard

physical communications interface（通信接口） between the Bluetooth controller and

remainder of the Bluetooth system including thdeL2CAP,service layers and higher

layers （known as the Bluetooth host）. Although this interface is optional ,the

architecture is designed to allow for its existence and characteristics .The

Bluetooth specification enable interoperability between independent Bluetooth

enabled systems by defining the protocol messages exchanged between equivalent

layers ,and also interoperability between independent Bluetooth sub-systems by

defining a common interface between Bluetooth controllers and Bluetooth hosts.

最低的3层有时被分为称为蓝牙控制器的子系统。这是一个常见的实现涉及到蓝牙控制器和蓝牙系统，包括thdeL2CAP ，服务层和更高的层（被称为蓝牙主机）的其余部分之间的物理标准通信接口。虽然这个接口是可选的，该架构的设计允许它的存在和特性。蓝牙规范定义的协议报文交换的对等层之间实现互操作性（互用性，协同工作的能力）的独立蓝牙系统之间，也通过定义蓝牙控制器和蓝牙主机之间的通用接口独立的蓝牙子系统之间的互操作性。

A number of functional blocks are shown and the path of services and data between

these. The functional blocks shown in the diagram are informative; in general the

Bluetooth specification does not define the details of implementation except where

this is required for interoperability.

若干功能模块被示出并在它们之间的服务和数据的路径。在图中所示的功能块是信息;在一般的蓝牙规范没有定义实现的细节除非这是必需的互操作性。

Standard interactions are defined for all inter-device operation, where Bluetooth

devices exchange protocol signaling according to the Bluetooth specification. The

Bluetooth core system protocols are the radio (RF（射频) protocol , link control

(LC) protocol, link manager (LM) protocol and logical link control and adaptation

protocol (L2CAP), all of which are fully defined in subsequent parts of the Bluetooth

specification. In addition, the service discovery protocol (SDP) is a service layer

protocol required by all Bluetooth applications.

标准的交互定义的所有设备间的操作，根据蓝牙规范，其中的蓝牙设备交换协议信令。蓝牙核心系统协议是无线电（RF（射频））协议，链路控制（LC）协议，链路管理器（LM）协议和逻辑链路控制和适配协议（L2CAP） ，所有这些在以后的部分被完全定义蓝牙规范。此外，该服务发现协议（SDP）是由所有的蓝牙应用所需的服务层协议。

The Bluetooth core system offers services through a number of service access points

that are shown in the diagram as ellipses（椭圆）. These services consist of the

basic primitives that control the Bluetooth core system. The services can be split

into three types. There are device control services that modify the behavior and