
【国外标准】 Pulse transmission of backward signals A-3, A-4, A-6 or A-15. Multifrequency signalling equipment
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2025-06-10
- ITU-T Q.442
- 现行
- 定价:
- 在线阅读
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适用范围:
暂无
标准号:
ITU-T Q.442
标准名称:
Pulse transmission of backward signals A-3, A-4, A-6 or A-15. Multifrequency signalling equipment
英文名称:
标准状态:
现行-
发布日期:
2025-11-01 -
实施日期:
出版语种:
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