ETSI EN 300 450-接入和终端（AT）；普通和特殊质量语音带宽双线模拟租用线路（A2O和A2S）；终端设备接口-国家数字标准馆

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Access and Terminals (AT); Ordinary and Special quality voice bandwidth 2-wire analogue leased lines (A2O and A2S); Terminal equipment interface 接入和终端（AT）；普通和特殊质量语音带宽双线模拟租用线路（A2O和A2S）；终端设备接口

发布日期： 2001-07-01

接口终端设备侧的规范和合规性测试程序。在收到TC安全部门的联络后，修订ETS 300 450，以改进安全相关文本。

Specification of the terminal equipment side of the interface and test procedures for compliance. Revision of ETS 300 450 to improve the safety related text following a liaison received from TC Safety.

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发布单位或类别：国际组织-欧洲电信标准协会

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ETSI EN 300 453

Access and Terminals (AT); Ordinary and Special quality voice bandwidth 4-wire analogue leased lines (A4O and A4S); Terminal equipment interface
接入和终端（AT）；普通和特殊质量的语音带宽四线模拟租用线路（A4O和A4S）；终端设备接口

ETSI EN 300 451

Access and Terminals (AT); Ordinary quality voice bandwidth 4-wire analogue leased line (A4O); Connection characteristics and network interface presentation
接入和终端（AT）；普通质量语音带宽四线模拟租用线（A4O）；连接特性和网络接口演示

ETSI EN 300 448

Access and Terminals (AT); Ordinary quality voice bandwidth 2-wire analogue leased line (A2O); Connection characteristics and network interface presentation
接入和终端（AT）；普通质量语音带宽双线模拟租用线（A2O）；连接特性和网络接口演示

UNE-ETS 300450-1997

BUSINESS TELECOMMUNICATIONS (BTC). ORDINARY AND SPECIAL QUALITY VOICE BANDWIDTH 2-WIRE ANALOGUE LEASED LINES (A2O AND A2S). TERMINAL EQUIPMENT INTERFACE.
商业电信（BTC）普通和特殊质量语音带宽双线模拟租用线路（A2O和A2S）终端设备接口

ETSI ETS 300 450

Business TeleCommunications (BTC); Ordinary and Special quality voice bandwidth 2-wire analogue leased lines (A2O and A2S); Terminal equipment interface
商业电信（BTC）；普通和特殊质量语音带宽双线模拟租用线路（A2O和A2S）；终端设备接口

UNE-ETS 300453-1997

BUSINESS TELECOMMUNCATIONS (BTC). ORDINARY AND SPECIAL QUALITY VOICE BANDWIDTH 4-WIRE ANALOGUE LEASED LINES (A4O AND A4S). TERMINAL EQUIPMENT INTERFACE.
商业电信（BTC）普通和特殊质量的语音带宽四线模拟租用线路（A4O和A4S）终端设备接口

ETSI ETS 300 453

Business TeleCommunications (BTC); Ordinary and Special quality voice bandwidth 4-wire analogue leased lines (A4O and A4S); Terminal equipment interface
商业电信（BTC）；普通和特殊质量的语音带宽四线模拟租用线路（A4O和A4S）；终端设备接口

Access and Terminals (AT) - Ordinary and special quality voice bandwidth 2-wire analogue leased lines (A2O and A2S) - Terminal equipment interface (Endorsement of the English version EN 300450 V 1.2.1 (2001-07) as German Standard)
接入和终端（AT）.普通和特殊质量语音带宽双线模拟租用线路（A2O和A2S）.终端设备接口（作为德国标准认可英文版EN 300450 V 1.2.1（2001-07））

Access and Terminals (AT) - Ordinary and special quality voice bandwidth 4-wire analogue leased lines (A4O and A4S) - Terminal equipment interface (Endorsement of the English version EN 300453 V 1.2.1 (2001-07) as German Standard)
接入和终端（AT）.普通和特殊质量语音带宽4线模拟租用线路（A4O和A4S）.终端设备接口（作为德国标准认可英文版EN 300453 V 1.2.1（2001-07））

Business TeleCommunications (BTC); Ordinary and Special quality voice bandwidth 4-wire analogue leased lines (A4O and A4S); Attachment requirements for terminal equipment interface
商业电信（BTC）；普通和特殊质量的语音带宽四线模拟租用线路（A4O和A4S）；终端设备接口附件要求

UNE-TBR 17-1997

BUSINESS TELECOMMUNICATIONS (BTC). ORDINARY AND SPECIAL QUALITY VOICE bandwidth 4-wire analogue leased lines (A4O and A4S). Attachment requirements for terminal equipment interface.
商业电信（BTC）普通和特殊质量的语音带宽四线模拟租用线路（A4O和A4S）终端设备接口的附件要求

Business TeleCommunications (BTC); Ordinary and Special quality voice bandwidth 2-wire analogue leased lines (A2O and A2S); Attachment requirements for terminal equipment interface
商业电信（BTC）；普通和特殊质量语音带宽双线模拟租用线路（A2O和A2S）；终端设备接口附件要求

UNE-TBR 15-1997

BUSINESS TELECOMMUNICATIONS (BTC). ORDINARY AND SPECIAL QUALITY VOICE BANDWIDTH 2-WIRE ANALOGUE LEASED LINES (A2O AND A2S). ATTACHMENT REQUIrements for terminal equipment interface.
商业电信（BTC）普通和特殊质量语音带宽双线模拟租用线路（A2O和A2S）终端设备接口的附件要求

ETSI EN 300 452

Access and Terminals (AT); Special quality voice bandwidth 4-wire analogue leased line (A4S); Connection characteristics and network interface presentation
接入和终端（AT）；特殊质量语音带宽四线模拟租用线路（A4S）；连接特性和网络接口演示

ETSI EN 300 449

Access and Terminals (AT); Special quality voice bandwidth 2-wire analogue leased line (A2S); Connection characteristics and network interface presentation
接入和终端（AT）；特殊质量语音带宽双线模拟租用线路（A2S）；连接特性和网络接口演示

Access and Terminals (AT) - Ordinary quality voice bandwidth 2-wire analogue leased line (A2O) - Connection characteristics and network interface presentation (Endorsement of the English version EN 300448 V 1.2.1 (2001-07) as German Standard)
接入和终端（AT）.普通质量语音带宽2线模拟租用线路（A2O）.连接特性和网络接口表示（作为德国标准认可英文版EN 300448 V 1.2.1（2001-07））

Access and Terminals (AT) - Ordinary quality voice bandwidth 4-wire analogue leased line (A4O) - Connection characteristics and network interface presentation (Endorsement of the English version EN 300451 V 1.2.1 (2001-07) as German Standard)
接入和终端（AT）.普通质量语音带宽4线模拟租用线路（A4O）.连接特性和网络接口表示（作为德国标准认可英文版EN 300451 V 1.2.1（2001-07））

Access and Terminals (AT) - Special quality voice bandwidth 2-wire analogue leased line (A2S) - Connection characteristics and network interface presentation (Endorsement of the English version EN 300449 V 1.2.1 (2001-07) as German Standard)
接入和终端（AT）.特殊质量语音带宽2线模拟租用线路（A2S）.连接特性和网络接口表示（作为德国标准认可英文版EN 300449 V 1.2.1（2001-07））

Access and Terminals (AT) - Special quality voice bandwidth 4-wire analogue leased line (A4S) - Connection characteristics and network interface presentation (Endorsement of the English version EN 300452 V 1.2.1 (2001-07) as German Standard)
接入和终端（AT）.特殊质量语音带宽4线模拟租用线路（A4S）.连接特性和网络接口表示（认可英语版EN 300452 V 1.2.1（2001-07）为德国标准）

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