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What are the pin assignments after conversion from unbalanced to balanced for the E1 port of the BNC connector on the U1900 unified gateway E1/T1 trunk

After the unbalanced cable of the E1 port is converted to a balanced cable, the pin assignments are as follows:
BNC: RX <-->RJ45: 1 and 2
BNC: TX <-->RJ45: 4 and 5
For more information, see the Quick Installation Guide of the U1900 series unified gateway.

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What are the pin assignments after conversion from unbalanced to balanced for the E1 port of the BNC connector on the U1900 unified gateway E1/T1 trunk

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