ETSI EN 300 451-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-国家数字标准馆

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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

发布日期： 2001-07-01

接口的公共网络侧规范和专线服务的性能，包括ETS 300 451合规性修订的测试程序，以在TC safety联络后改进安全相关文本。

Specification of the public network side of the interface and the performance of the leased line service, including test procedures for compliance Revision of ETS 300 451 to improve the safety related text following a liaison 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 300 450

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

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 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

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

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

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））

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 300451-1997

BUSINESS TELECOMMUNICATIONS (BTC). ORDINARY QUALITY VOICE BANDWIDTH 4-wire analogue leased line (A40). Connection characteristics and network interface presentation.
商业电信（BTC）普通质量语音带宽4线模拟租用线路（A40）连接特征和网络接口演示

ETSI ETS 300 451

Business TeleCommunications (BTC); Ordinary quality voice bandwidth 4-wire analogue leased line (A4O); Connection characteristics and network interface presentation
商业电信（BTC）；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

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））

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

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

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 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) - 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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