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⟦6926d7e07⟧ Wang Wps File
Length: 4154 (0x103a)
Types: Wang Wps File
Notes: FIX/1000/PSP/0038,SYST.SP
Names: »5284A «
Derivation
└─⟦e48583e73⟧ Bits:30006141 8" Wang WCS floppy, CR 0514A
└─ ⟦this⟧ »5284A «
WangText
…0f…
5284A/bna…02…FIX/1000/PSP/0038
…02…JL/850529…02……02…
FIKS SYSTEM SPECIFICATION
…02……02…FK7809…0e…
4.1.1.3.11 O̲u̲t̲b̲o̲u̲n̲d̲ ̲N̲o̲d̲a̲l̲ ̲S̲w̲i̲t̲c̲h̲i̲n̲g̲
The MDS makes an entry in the Nodal Switch Subsystem's
input queue which requests route selection and transmission
of the message to the network (43). The MTCB index
number which refers to the message is entered in the
NSS's "transport queue" which serves the precedence
level requested when the message was prepared.
The enqueued MTCB contains the file address and length
of the message. If the Storage and Retrieval Subsystem
enters the message into the HDB before the NSS accesses
the MTCB, the new address of the message is recorded
in the appropriate field of the MTCB. The MTCB also
contains the identifiers of the MEDEs which serve the
addressee-terminals.
NICS addresses and messages directed to the active
and standby SCC's are assigned appropriate routing
identifiers.
4.1.1.3.11.1
O̲u̲t̲b̲o̲u̲n̲d̲ ̲T̲r̲u̲n̲k̲ ̲Q̲u̲e̲u̲i̲n̲g̲
Employing the QACCESS and MTCB Monitors, the NSS examines
the routing mask of the message whose precedence is
highest in the Transport Queue. It then references
its preferred routing table to select the appropriate
trunk for transmission.
If the neighbouring node selected for the preferred
route is unavailable, then a secondary node is selected
from the routing table.
The message is then associated with a transmission
serial number for each copy to be forwarded to neighbouring
nodes. Serial numbers are assigned within a precedence
level and are entered into the list of unacknowledged
messages, accompanied by the MTCB index number of the
message.
Control blocks containing a set of disk file references
to the message are constructed. The references essentially
are disk addresses dividing the message into packets
suitable for transmission.
Also included in the control block of the message is
a reference to the routing data needed to construct
the binary header of the message.
These control blocks are entered into the Trunk Queue.
The is one Trunk Queue dedicated to each trunk. Each
queue contains one subqueue for each precedence level.
4.1.1.3.11.2
O̲u̲t̲b̲o̲u̲n̲d̲ ̲P̲a̲c̲k̲e̲t̲ ̲T̲r̲a̲n̲s̲m̲i̲s̲s̲i̲o̲n̲
A message is selected for transmission on a trunk where
there is an entry waiting in a neighbouring node's
input buffer.
The first packet of the message is read from the file
that is referenced in the control block of the trunk
queue (44). The binary header of the message is justified
in the first packet to form an unencrypted packet.
The Input/Output System is called to initiate the transfer
of the packet from the CR80 memory buffer to the Red
TDX System's private memory (45). The I/O request is
initiated by the Nodal Switch Subsystem as direct output
to a logical line.
If a negative acknowledgement is received, then the
message is retransmitted (44a).
After the last packet has been sent and receipt of
the message has been acknowledged, the serial number
of the message is removed from the list of unacknowledged
messages. The MTCB Monitor is called to release the
MTCB of the message. If the message was being read
by the NSS from an Intermediate Message File (relay
messages) or from the Preparation Data Base, the file
will be released by the Monitor (45).
4.1.1.3.12 M̲e̲s̲s̲a̲g̲e̲ ̲T̲e̲r̲m̲i̲n̲a̲l̲ ̲L̲o̲g̲o̲f̲f̲
A message terminal operator removes an interactive
terminal from service by requesting that the ITM log
off the terminal (46). The operator enters the user
id and the password that were provided when the terminal
was last logged onto the MEDE.
If the terminal is a VDU, then logoff removes from
service the receive-only printer that is connected
to the VDU. Messages addressed to the ANOs represented
by the terminal continue to be enqueued by the MDS
into the print queues of the terminal. MEDE supervisory
terminal operators have the control option of rerouting
this traffic to another terminal.
