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

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

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

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

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

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

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

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

Business TeleCommunications (BTC); Ordinary quality voice bandwidth 2-wire analogue leased line (A2O); Connection characteristics and network interface presentation
商业电信（BTC）；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

1996-02-01

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

BUSINESS TELECOMMUNICATIONS (BTC). ORDINARY QUALITY VOICE BANDWIDTH 2-wire analogue leased line (A20). Connection characteristics and network interface presentation.
商业电信（BTC） 普通质量语音带宽双线模拟租用线路（A20） 连接特征和网络接口演示

1997-11-20

Business TeleCommunications (BTC); Special quality voice bandwidth 4-wire analogue leased line (A4S); Connection characteristics and network interface presentation
商业电信（BTC）；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

1996-02-01

Business TeleCommunications (BTC); Special quality voice bandwidth 2-wire analogue leased line (A2S); Connection characteristics and network interface presentation
商业电信（BTC）；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

1996-02-01

BUSINESS TELECOMMUNICATIONS (BTC). SPECIAL QUALITY VOICE BANDWITH 4-WIre analogue leased line (A4S). Connection characteristics and network interface presentation.
商业电信（BTC） 带有4线模拟租用线路（A4S）的特殊质量语音带 连接特征和网络接口演示

1997-11-20

BUSINESS TELECOMMUNICATIONS (BTC). SPECIAL QUALITY VOICE BANDWIDTH 2-Wire analogue leased line (A2S). Connection characteristics and network interface presentation.
商业电信（BTC） 特殊质量语音带宽双线模拟租用线路（A2S） 连接特征和网络接口演示

1997-11-20