This TruthValue enables or disables Quality Level Mode on the BITS 8 Port Group, which when enabled makes the port peer SSM slow-protocol PDUs on receive and periodically transmit QL TLV information on transmit, and when disabled makes the receive side terminate and discard such PDUs instead. Admins enable QL Mode so the network can automatically track and act on the quality level of this BITS timing source, supporting automatic failover to better clocks. For example, an admin enables bits8PortGroupQLModeEnabled on a BITS group feeding multiple network elements so those elements can automatically detect if this timing source's quality degrades and switch to a better one.