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HD7880C Hole Drilling Machine  transmits up to 30 channels of voice, 2 channels of Ethernet and 4 channels of E1 over a pair of fiber (or one single fiber).With all FXO/FXS modules soldered to the main board, this model is more cost-effective than modular ones and also has a more stable performance. Besides, 4 E1 channels are able to provide users with extra 120 channels for 64Kbps voice/data signal transmission, which makes IDM-30EN also very expandable.