Grading standard for quality of carrier telephone equipment . 120 - channel carrier telephone small core coaxial cable equipment 载波电话设备质量分等标准.小同轴电缆120路载波电话设备
2.
Grading standard for quality of carrier telephone equipment . 960 - channel carrier telephone small core coaxial cable equipment 载波电话设备质量分等标准.小同轴电缆960路载波电话设备
3.
Grading standard for quality of carrier telephone equipment . 300 - channel carrier telephone small core coaxial cable equipment 载波电话设备质量分等标准.小同轴电缆300路载波电话设备