
T400 Controller Facilities Manual
667/EB/20200/000 Page 9-18 Issue 9
am and the real Introduction time of the Plan. The controller then brings the C.L.F.
plan into synchronisation based upon this.
(N.B. It may take up to 3 cycles of a plan to achieve synchronisation, and plans must
be carefully constructed to ensure synchronisation can be achieved.)
Thus, if all controllers in an area are configured as this Option, they will always remain
in synch with each other regardless of when a plan is actually introduced because
everything is based on a theoretical introduction time of 2.00 am.
(See also 9.9.8 for further details.)
9.3.11 UTC Parallel Stage Streaming Facilities
UTC mode can be active on any or all of the streams. If there are force bits present on
any stream then the UTC active lamp will illuminate on the manual panel. Each stream
can respond to its force bits independently of the other streams. If, however, it is
required to have Master-Master UTC Linking, i.e. for UTC mode to operate on any
stream, force bits are required to be present for all streams, then the UTC mode may
be disabled on the relevant streams by Special Conditioning until the correct force bits
are available.
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