SNAX/HLS Management Programming Manual

Standard SNAX/HLS Definitions
Common Definitions
6–40 104708 Tandem Computers Incorporated
ZFSM–BSM
reports the SNAX/HLS implementation of FSM_BSM. This finite state machine
reflects the bracket state manager states. SNAX/HLS uses the bracket state
manager rules appropriate to the half session.
This field has the following enumerated values:
ZHLS–VAL–FSM–BSM–BETB
indicates that the session is between brackets. If brackets are used by the
session, any request chains sent or received in this state (exception for certain
DFC requests) must have the begin brackets (BB ) bit set.
ZHLS–VAL–FSM–BSM–INB
indicates that the session is in brackets. A request has previously been seen
bearing the BB bit. Request chains in this state must not bear the BB bit;
however, they might bear the end brackets indicator (EBI), indicating the end
of the bracket.
ZHLS–VAL–FSM–BSM–NULL
indicates that this FSM is not yet initialized or is not used in the current
session.
ZHLS–VAL–FSM–BSM–P–BB
indicates that a beginning of brackets is pending. The bidder has asked for
and received permission to start a bracket. In SNA terms, it means a positive
response to a BID request has arrived. The next chain should bear the BB bit.
ZHLS–VAL–FSM–BSM–P–INB
indicates a state entered when the bidder sends a BB request in BETB state
without first issuing a BID request. This is one way to begin a bracket;
however, the bidder must tolerate a reject. The first speaker grants permission
to the bidder to start a bracket when the bidder sends a positive response to
the BB request
ZHLS–VAL–FSM–BSM–P–TERM–R
indicates a request carrying EB (end bracket) indicator has been received,
while a transaction (SNA bracket) is in progress (bracket state INB). The
bracket is terminated (transition to between bracket state, BETB) at the end of
the chain, or if a definite response is requested when that response to the EB
chain is sent. If the EB chain is cancelled, the bracket state reverts to INB.