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Entry/Exit Check of an MDS in an SLG Field
The codes shown below are used in the diagram on the following page:
These MDS states are possible at an SLG:
MDS not present
MD
new/next MDS present
MDN
current or old (no longer current) MDS present
MDA
command present (has been issued by the FC 56)
BD
command not present (has not yet been issued by the FC 56)
BD
command in progress (a command is now being executed)
BIA
"Next MDS bit" set in the filehandler (NEXT command had been issued by the
ND
FC 56). The processing of all subsequent commands takes place only with the
next/new MDS.
"Next MDS bit" not set in the filehandler (NEXT command has not yet been issued
ND
by the FC 56).
EAKO = MDS_IO_control
Î Î Î
Filehandler action
Î Î Î
Status at an SLG station
6-8
FC 56
J31069-D0155-U001-A0-7618
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