现行

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

2001-07-01

现行

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

2001-07-01

现行

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

2001-07-01

现行

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

2001-07-01

现行

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

1997-11-20

现行

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

1996-02-01

现行

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

2001-07-01

现行

ETSI TBR 017

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

1997-01-01

现行

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

1997-07-15

现行

DIN EN 300453

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））

2002-01-01

现行

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

1997-11-20

现行

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

1996-02-01

现行

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

1997-11-20

现行

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

1996-02-01

现行

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

2001-07-01

现行

ETSI TBR 015

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

1997-01-01

现行

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

1997-07-15

现行

DIN EN 300450

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））

2002-01-01

现行

DIN EN 300448

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））

2002-01-01

现行

DIN EN 300452

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）

2002-01-01