英语翻译H.323 Terminal,is an endpoint on the network which provi

英语翻译
H.323 Terminal,is an endpoint on the network which provides for real-time,two-way communications with
another H.323 terminal,Gateway,or Multipoint Control Unit.A terminal may provide speech only,speech and
data,speech and video,or speech,data and video.The block functional structure of an H.323 terminal is
shown in the Figure 3.
· H.323 Gateway (GW),is an endpoint on the H.323 network which provides for real time,two-way
communications between H.323 Terminals and other ITU Terminals connected,for example,to PSTN,ISDN,
broadband ISDN (ATM),or QoS enhanced LANs.The purpose of the Gateway is to reflect the characteristics
of a network endpoint to a Switch Circuits Network (SCN) endpoint,and the reverse,in a transparent way.
Functions like translation between transmission formats and between communications procedures must be
provided.
· Multipoint Control Unit (MCU),is an endpoint on the network which provides the capability for three or
more terminals and Gateways to participate in a multipoint conference.It may also connect two terminals in a
point-to-point conference which may be later developed into a multipoint conference.The MCU consists of
two parts:a mandatory Multipoint Controller (MC) which provides capability negotiation between all terminals
to achieve common levels of communications and optional Multipoint Processors (MP),which performs mixing
or switching of audio,video and data.This functionality could be integrated in an H.323 terminal.
· GateKeeper (GK),is an H.323 entity on the network that provides call control services to the H.323
endpoints.This element is the key block of the H.323 architecture for development of services and for the
application of this technology in a medium-large environment.In principle the GK is an optional block of the
architecture -that was decided in order to boost the development of H.323 terminals without the requirement
of a complex element-,but without this element the model is quite limited.GK provides important services
like:address translation and directory services,admission and bandwidth control,call control signalling or call
authorization.

H.323 终端机,是在为即时的,双行道的沟通提供的网络上的 endpoint
另外的 H.323个终端机,出入口或多点控制单位.一个终端机只可能提供演讲,演讲和
数据,演讲和录象机 ,或演讲,数据和录象机.区段 H 的功能结构.323个终端机是
在图 3 中显示.
· H.323 出入口 (GW),是在 H 上的 endpoint .323个提供真正的时间以来的网络,双行道的
在 H 之间的沟通.323 终端机和其他的 ITU 终端机连接,举例来说,到 PSTN,综合服务数字网,
宽频综合服务数字网 (自动柜员机),或 QoS 提高了区域网络.出入口的目的要反映特性
一个网络,开关线路网络 (SCN) endpoint 的 endpoint 和相反,以一透明的方式.
功能相似的翻译在传输格式之间而且在沟通程序之间一定是
提供.
· 多点控制单位 (MCU),是在提供能力给的网络上的 endpoint 三或
较多的终端机和出入口参与一个多点会议.它也可能连接二个终端机在一
可能是比较迟的进入一个多点会议之内发展的越过原野的会议.MCU 所组成
二个部份:一个提供在所有的终端机之间的能力谈判的强制性的多点控制器 (MC)
达成通常程度的沟通和可选择的多点处理器 (议员),运行混合
或声音,录象机和数据的转变.这一个功能性在 H 可能被整合.323个终端机.
· 看门人 (GK),是 H .在提供呼叫控制服务给 H 的网络上的 323个实体.323
endpoints.这一种元素是钥匙 H 的区段.323 建筑学为服务的发展和为那
媒体- 大的环境这一种技术的申请.大体而言 GK 是一可选择范围的那
建筑学 - 那被决定为了要推进 H 的发展.没有需求的 323个终端机
一个合成物元素-,但是没有这一种元素模型被相当限制.GK 提供重要的服务
像:向翻译和目录服务,许可和带宽控制演说,呼叫控制作信号或呼叫
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