The PTN3900 device needs to complete the access and processing of E1 signals through the processing board, service daughter card, and interface board. Which of the following boards is not involved in the
PTN can support in-band DCN. At this time, the port needs to enable the DCN function, so PTN equipment cannot be managed by in-band DCN during CESservices.A. TrueB. FalseAnswer: B
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