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- Primary Rate Interface (PRI) is an ISDN interface for primary rate access , which consists of a single 64-kbps D channel plus 23 (T1) or 30 (E1) B channels for voice or data. 主速率接口是一个适用于主速率通道的ISDN接口，它是由一个单个的64-kbps的D通道再加23个（T1）或30个（E1）语音或数据B通道构成的。
- primary rate access 一次群速率接入
- This paper describes an interface architecture of ISDN basic rate access interface(2B+D)for existing switching systems. 本文主要描述为交换机提供(2B+D)基本速率入口的 ISDN 接口的结构.
- Interfaces for the 1544 kbit/s primary rate and for the 2048kbit/s primary rate are described. 本建议描述了1544kbit/s一次群速率和2048kbit/s一次群速率的接口。
- Because SS7 has more intelligent capabilities than User-Network Interface protocols such as ISDN Primary Rate Interface, SS7 can help ease congestion across the Internet. 由于七号信令比诸如ISDN的基础速率接口等用户网络接口协议更具智能功能，所以七号信令有助减轻因特网上的拥挤。
- Because SS7 has more intelligent capabilities than User-Network Interface protocols such as ISDN Primary Rate Interface,SS7 can help ease congestion across the Internet. 由于七号信令比诸如ISDN的基础速率接口等用户网络接口协议更具智能功能，所以七号信令有助减轻因特网上的拥挤。
- A long distance phone company can provide ANI which may arrive over the D channel of an ISDN primary rate interface circuit or via a dedicated single line before the first ring. 美国有各种ANI，长话公司能提供ANI，它可在ISDN基本速率接口电路的D信道上到达，或在首次振铃之前通过专用线到达。
- ISDN Basic Rate Access Interface for Existing Switching Systems 现有程控交换机的ISDN基本速率接口
- A Study on the Technology for ISDN Basic Rate Access ISDN基本速率接入技术研究
- The disease is still in its primary stage. 这疾病仍然在初发阶段。
- The little boy left primary school at eleven. 这个小男孩十一岁时小学毕业。
- Primary memory is known as random access memory(RAM) and simple named memory. 主存储器又称为随机存取存储器，简称内存。
- Sure. We are friends since primary school. 当然，我们从小学就是朋友了。
- I started primary school when I was 5 years old. 我五岁时开始读小学。
- A primary cause of Tom's failure is his laziness. 懒惰是汤姆失败的主要原因之一。
- Primary school teachers use a lot of visual aids. 小学教师使用大量的视觉教具。
- Love and hatred are primary emotions. 爱和恨是基本的情感。
- The Democratic primary was held this month. 民主党候选人初选於本月举行。
- Primary education comes under the umbrella of local government. 小学教育受地方政府的保护。
- He only accepted the primary education off and on in his childhood. 他小时候只断断续续地接受过初等教育。
