半连接是指PABX中输出或输出连接的一部分，特指数字接口与PABX测试点之间单向64kbit/s路径连接，用于传输特性的测量和规范，包括传输损耗、噪声、失真和串扰等参数。
| 标准号 & 类别 | 标准名称 | 发布 |
|---|---|---|
| ETSI ES 201 168-2000 规范 |
语音处理,传输和质量方面(STQ).用于专用网,公共交换网或IP网关的互连的数字专用小交换机的传输特性(版本1.2.1) Speech Processing, Transmission and Quality Aspects (STQ); Transmission Characteristics of Digital Private Branch eXchanges (PBXs) for Interconnection to Private Networks, to the Public Switched Network or to IP Gateways (V1.2.1)
测试点 |
2000 欧洲电信标准协会 |
| ETSI ETS 300 439 ed.1 (1996-12)-1996 规范 |
Business TeleCommunications (BTC); Transmission characteristics of digital Private Branch eXchanges (PBXs)
测试点 |
1996-12-01 欧洲电信标准协会 |
| ETSI I-ETS 300 005 ed.1 (1991-08)-1991 试验标准 |
商业电信（BT） 数字专用自动交换机（PABX）的4线模拟接口的传输特性 Business Telecommunications (BT); Transmission characteristics at 4-wire analogue interfaces of a digital Private Automatic Branch Exchange (PABX)
|
1991-08-01 欧洲电信标准协会 |
| ETSI I-ETS 300 006 ed.1 (1991-08)-1991 规范标准 |
商业电信（BT） 数字专用自动交换机（PABX）数字接口的传输特性 Business Telecommunications (BT); Transmission characteristics at digital interfaces of a digital Private Automatic Branch Exchange (PABX)
数字接口 |
1991-08-01 欧洲电信标准协会 |
| ITU-T Q.552-1996 试验 |
数字交换机 2 线模拟接口的传输特性 Q 系列：开关和信令 数字交换机 传输特性（第 15 研究组；42 页） Transmission Characteristics at 2-Wire Analogue Interfaces of Digital Exchanges - Series Q: Switching and Signalling - Digital Exchanges - Transmission Characteristics (Study Group 15; 42 pp)
混合器 |
1996-11-01 国际电信联盟 |
| ITU-T Q.552-2001 试验 |
Transmission Characteristics at 2-Wire Analogue Interfaces of Digital Exchanges Series Q: Switching and Signalling Digital Exchanges - Transmission Characteristics Study Group 15
|
2001 国际电信联盟 |
| ITU-T Q.553-1996 试验 |
数字交换机 4 线模拟接口的传输特性 Q 系列：开关和信令数字交换机 传输特性（第 15 研究组；19 页） Transmission Characteristics at 4-Wire Analogue Interfaces of Digital Exchanges - Series Q: Switching and Signalling Digital Exchanges - Transmission Characteristics (Study Group 15; 19 pp)
|
1996-11-01 国际电信联盟 |
| ITU-T Q.553-2001 试验 |
Transmission Characteristics at 4-Wire Analogue Interfaces of Digital Exchanges - Series Q: Switching and Signalling Digital Exchanges - Transmission Characteristics Study Group 15
|
2001 国际电信联盟 |
| ITU-T Q.554-1994 规范 |
数字交换机数字接口的传输特性 数字交换机（第 15 研究组；6 页） Transmission Characteristics at Digital Interfaces of Digital Exchanges - Digital Exchanges (Study Group 15; 6 pp)
|
1994-01-01 国际电信联盟 |
| ITU-T Q.554-1996 规范 |
Transmission Characteristics at Digital Interfaces of Digital Exchanges - Series Q: Switching and Signalling Digital Exchanges - Transmission Characteristics Study Group 15; 11 pp
数字接口 |
1996 国际电信联盟 |
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