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Test of Bit Errors
Off-line test method
1. select a traffic channel (E1, E3, T3, E4 or STM-1)
2. Connect the TX and RX ports of BER tester with the RX and
TX PDH/SDH interfaces of this equipment respectively
3. Perform inloop to the PDH/SDH interface of the opposite
station (e.g., perform hardware self-loop at the DDF)
4. Test the bit error
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