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In a ring-structured data communication network applicable to distributed processing, data processing software at ring nodes may invoke a monitor mode of operation.
English (United States)
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Active Ring Monitor Mode
In a ring-structured data communication network applicable to distributed
processing, data processing software at ring nodes may invoke a monitor mode
In this mode, ring interfacing (adapter) equipment at a receiving node
discards messages incoming from the ring which have either a "broadcast"
destination address or an origin address different from the local address
assigned to the station, with certain exceptions. The "broadcast" messages are
messages which are intended for reception at all stations or all stations in a
group of stations. The exceptions are externally originated messages indicating
a status inquiry relative to the respective station or an open/short condition on the
ring. Consequently, stations operating in this mode are effectively timed to
receive (and monitor) only their own transmissions.
Any station attempting to communicate with a station in active monitor mode
will receive a busy response and post an exception interruption to its respective
data processing software. The monitor mode can be terminated by a reset signal
from the respective processor, an explicit command from the respective
processor, an open/short broadcast signal sent by another station, or a message
which the station transmits to itself through the ring.
While in the active monitor mode, a station can request status and error log
information from other stations on the ring, thereafter circulate a frame instructing
itself to terminate...