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| GB/T 7720-1987 Technical requirements and test methods for semi-automatic toll terminal equipment (English Version) |
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Detail of GB/T 7720-1987
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Introduction of GB/T 7720-1987
本标准适用于长途电话半自动对端设备。该设备作为终端设备用于两城市的长途电话局间，通过长途直达电路，实现长途电话半自动接续，也可经长途电话在交换机纳入全国长途自动电话网。
Contents of GB/T 7720-1987