Which of the following statements is true?

The assertion that the Idle Signal (a) (0000111) is used for FEC Phasing Signal 1 is accurate. In digital communications, specific idle signals are defined for various purposes, including synchronization and establishing particular state conditions within the communication system. FEC, or Forward Error Correction, utilizes distinct signal patterns to help maintain data integrity during transmission.

By defining 'Idle Signal (a)' in this context, the communication system can ensure that it can identify the FEC Phasing Signal 1, which plays a crucial role in maintaining proper timing and alignment of data streams. It is important for identifiers in a communications protocol to be distinct and well-understood, facilitating reliable communication while minimizing errors.

Understanding the role of idle signals can be essential for any technician or engineer working with digital communication systems, as these signals often serve as default states or placeholders to ensure the system is ready to transmit or receive data effectively.