a reference pilot applied where a group is assembled and which accompanies the group over the system up to the point where it is broken down into its constituent elements
NOTE 1 – Various frequencies have been standardized by the CCITT for group reference pilots within the frequency band of a basic group.
NOTE 2 – In certain cases, two reference pilots may be applied where a basic group is assembled.
NOTE 3 – Similar definitions can be given for: "supergroup reference pilot", "mastergroup reference pilot", "supermastergroup reference pilot", "15-supergroup assembly reference pilot" or "hypergroup reference pilot".
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