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5203A/bna…02…FIX/1000/PSP/0038
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FIKS SYSTEM SPECIFICATION
…02……02…FK7809
4.3.3 T̲h̲e̲ ̲I̲n̲t̲e̲r̲a̲c̲t̲i̲v̲e̲ ̲T̲e̲r̲m̲i̲n̲a̲l̲ ̲M̲o̲n̲i̲t̲o̲r̲
4.3.3.1 F̲u̲n̲c̲t̲i̲o̲n̲
The ITM provides to terminal-oriented application processes
a set of services that are common to interactive terminals
regardless of the specific application. These include
procedures for the user log on and log off sequences;
the entering of commands that initiate terminal processes;
the entering of textual data for storage on message
preparation, edit and remarks files; the cancelling
of any transaction procedure inexecution fdor a given
terminal; and the recovery of input to message preparation
files and restart of terminal processes that were in
execution at the time of a system malfunction.
The services are provided by the following modules:
- P̲r̲o̲c̲e̲s̲s̲ ̲S̲t̲a̲r̲t̲ ̲M̲o̲d̲u̲l̲e̲ (PSM)
which supports the functions:
- Subsystem initialization
- Terminal handling
Blocking and unblocking of terminals
Queue status line updating
Interface between terminal processes and
the Printer Interface Process (PIP).
- T̲e̲r̲m̲i̲n̲a̲l̲ ̲C̲o̲m̲m̲a̲n̲d̲ ̲M̲o̲d̲u̲l̲e̲ (TCM)
which supports the functions:
- Get (and interprete) terminal command
- Execute interactive procedures
Log-on
Log-off
- T̲e̲r̲m̲i̲n̲a̲l̲ ̲I̲/̲O̲ ̲M̲o̲d̲u̲l̲e̲ (TIOM)
which supports the functions:
- Create/dismantle channels
- Transfer data
- Control screen (VDU)
- Wait operations
- Send AMOS message
- E̲r̲r̲o̲r̲ ̲M̲o̲d̲u̲l̲e̲ (EM)
which supports the functions:
- Interactive error handling
- Reporting of errors to SFS
- V̲D̲U̲ ̲h̲a̲n̲d̲l̲e̲r̲ (VDUH)
which supports the function:
- Transfer data and control codes to the VDU
terminals.
4.3.3.2 S̲u̲b̲s̲y̲s̲t̲e̲m̲ ̲B̲l̲o̲c̲k̲ ̲D̲i̲a̲g̲r̲a̲m̲
Figure 4.3.3.2-1 illustrates the co-operation between
the modules in the terminal process, when interactive
procedures goes on.
When a number with small letters (e.g. (1a)) it indicates
that an exception may happen.
Abbreviations:
S/SA Supersivor/Supervisor Assistants
MPO Message Preparation Operator
PSM Process Start Module
TCM Terminal Command Module
EM Error Module
TIOM Terminal I/O Module
MES Message Entry Subsystem
PIP Print Interface Process
B̲l̲o̲c̲k̲ ̲D̲i̲a̲g̲r̲a̲m̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
The first terminal logged-on could be one of the supervisor/supervisor
assistants terminals (S/SA terminals)
1 - 4 Log-on sequence on S/SA terminal
5 PSM is informed
6 - 7 PIP is informed
8 - 9 Queue status line is displayed
10 Return to TCM
When the message preparation operator (MPO) logs-on
his terminal and calls an operational procedure.
51 - 51 Log-on sequence on MPO terminal
55 PSM is informed
56 - 57 PIP is informed
58 - 59 Queue stastus line is displayed (only if
the terminal is a VDU)
60 Return to TCM
61 - 64 TCM receives the operator command
65 The appropriate MES/SFS procedure is called
66 - 69 MES/SFS carries out the procedure
70 Return to TCM
At any time the S/SA are allowed to block or unblock
a terminal. In the following the block terminal command
is chosen.
11 - 14 TCM receives the S/SA command "block terminal"
15 The appropriate SFS procedure is called
16 - 19 SFS is starting the procedure
17b PSM is informed
18b - 19b PIP is informed
20b - 22b The terminal process is ordered to terminate
the current procedure.
23b - 24b Return to SFS
16 - 19 SFS is finishing the procedure
20 Return to TCM
If not blocked by the S/SA, the MPO can log-off his
terminal as follows (the S/SA log-off in the same way).
71 - 74 (21-24) TCM carries out the log-off procedure.
75 (25) PSM is informed
76 - 77 (26-27) PIP is informed
78 - (28) Return to TCM
E̲r̲r̲o̲r̲s̲
5e, 15e, 25e
Abnormal situations
55f, 65f, 75f
6e, 16e, 26e
Issue error code
56f, 66f, 76f
8e, 18e, 28e
Analyse result
58f, 68f, 78f
Figure 4.3.3.2-1
ITM Subsystem, Block Diagram
4.3.3.3 D̲e̲s̲i̲g̲n̲ ̲O̲v̲e̲r̲v̲i̲e̲w̲
The ITM Subsystem executes with one process for the
Process Start Module (PSM) and one interactive terminal
process for each interactive terminal logged on. (VDU
and TP).
An interactive terminal process executes the program
containing the entire modules of Message Entry Subsystem
(MES) and the Supervisor Function Subsystem (SFS) together
with all the ITM modules except for the Process Start
Module (illustrated in figure 4.3.3.3-1).
The Message Entry Subsystem and the Supervisory Function
Subsystem is implemented as procedures called by the
Terminal Command Module.
Terminal data shared between terminal processes and
other processes (e.g. PSM, PIP) are placed in Terminal
Control Blocks (TCB). The TCBs are located in Critical
Region.
See Figure 4.3.3.3-1 and 4.3.3.3-2 ITM software configuration.
Figure 4.3.3.3-1
ITM Subsystem, Design Overview
Figure 4.3.3.3-2
ITM Subsystem, Design Overview
4.3.3.3.1 P̲r̲o̲c̲e̲s̲s̲ ̲S̲t̲a̲r̲t̲ ̲M̲o̲d̲u̲l̲e̲ ̲(̲P̲S̲M̲)̲
The PSM process is common to all the terminal processes.
PSM supports the following functions:
1. Initialization
2. Terminal handling
Blocking and unblocking of terminals
Queue status line updating
Interface between terminal processes
and the Printer Interface Process (PIP).
1̲.̲ ̲ ̲I̲n̲i̲t̲i̲a̲l̲i̲z̲a̲t̲i̲o̲n̲
At initialization time the PSM creates a terminal control
block (TCB) for each terminal and load the data areas
common to all the terminal processes, from the initial
data files to the critical region. Then PSM creates
a channel to each VDU upper screen. At last PSM sends
a log-on message to PIP, for each paper tape puncher
(PTP) at the MEDE.
2̲.̲ ̲ ̲T̲e̲r̲m̲i̲n̲a̲l̲ ̲H̲a̲n̲d̲l̲i̲n̲g̲
The PSM handles the terminal on high level. This means,
the PSM receives and handles the following events:
Terminal is logged-on
Terminal is logged-off
Block terminal
Unblock terminal
Security interrogation
Timeout
T̲e̲r̲m̲i̲n̲a̲l̲ ̲i̲s̲ ̲l̲o̲g̲g̲e̲d̲-̲o̲n̲
Dependent on terminal type and log-on mode the terminal
is marked "ready" for updating of the queue status
lines and the PIP is informed.
T̲e̲r̲m̲i̲n̲a̲l̲ ̲i̲s̲ ̲l̲o̲g̲g̲e̲d̲-̲o̲f̲f̲
Dependent on terminal type the terminal is marked "not
ready" for updating of queue status lines and the PIP
is informed.
B̲l̲o̲c̲k̲ ̲t̲e̲r̲m̲i̲n̲a̲l̲
The terminal is marked blocked, and the actual terminal
process is informed. Depending on terminal type the
terminal is marked "not ready" fdor updating of queue
status lines and the PIP is informed.
U̲n̲b̲l̲o̲c̲k̲ ̲t̲e̲r̲m̲i̲n̲a̲l̲
The terminal is marked logged-off, and the actual terminal
process is informed.
S̲e̲c̲u̲r̲i̲t̲y̲ ̲i̲n̲t̲e̲r̲r̲o̲g̲a̲t̲i̲o̲n̲
The actual TCB is marked for security interrogation.
The interrogation mark is checked by the terminal process
each time the terminal goes to PROC mode.
T̲i̲m̲e̲o̲u̲t̲
The VDU terminals which are marked "ready" for updating
of the queue status lines are updated.
4.3.3.3.2 T̲e̲r̲m̲i̲n̲a̲l̲ ̲C̲o̲m̲m̲a̲n̲d̲ ̲M̲o̲d̲u̲l̲e̲ ̲(̲T̲C̲M̲)̲
The TCM in the terminal process supports the following
functions:
1. Initialization/Restart
2. Command handling
Module branching
Interactive LON/LOF procedures.
1̲.̲ ̲ ̲I̲n̲i̲t̲i̲a̲l̲i̲z̲a̲t̲i̲o̲n̲/̲R̲e̲s̲t̲a̲r̲t̲
At initialization time and after a restart the relations
between terminal processes, terminal number and terminal
control blocks are updated, and a channel is created
to the terminal.
2̲.̲ ̲ ̲C̲o̲m̲m̲a̲n̲d̲ ̲H̲a̲n̲d̲l̲i̲n̲g̲
The TCM in the terminal process handles the terminal
on operational procedure level. This means, the TCM
issues the prompt "PROC" and analyses the "PROC" response
and branches to the appropriate MFS/SFS/ITM module.
The "PROC" response is one of the commands used by
the message preparation opertor or the supervisor/supervisor
assistants.
The analyse of the "PROC" response consists of checking
the response against the operator authority, and against
the terminal type.
The interactive procedures log-on/off (LON/LOF), the
queue status display (QST) and the security interrogation
at the terminal is handled by the ITM itself.
In order to log-on a terminal, the operator must give
his user-id and password. The operator has 3 attempts
to give the correct user-id and password. If he fails
the log-on is unsuccessful
Successful/unsuccessful log-on/off and unsuccessful
security interrogation is logged on the transaction
log.
Unsuccessful log-on/off and unsuccessful security interrogation
causes an alarm to the N/M supervisor and the terminal
to be blocked.
If the operator calls a procedure above his authority,
the call is rejected.
4.3.3.3.3 T̲e̲r̲m̲i̲n̲a̲l̲ ̲I̲/̲O̲ ̲M̲o̲d̲u̲l̲e̲
Communication to the terminals, and to PSM is handled
by the Terminal I/O Module (TIOM). TIOM consists of
procedures which can be called by the other modules
in the terminal process. The TIOM procedures are:
1. Create channel
2. Dismantle channel
3. Transfer data
4. Control screen
5. Wait operation
6. Send message to PSM
C̲r̲e̲a̲t̲e̲ ̲c̲h̲a̲n̲n̲e̲l̲
The procedure creates a channel to the terminal associated
to terminal process.
D̲i̲s̲m̲a̲n̲t̲l̲e̲ ̲c̲h̲a̲n̲n̲e̲l̲
The procedure dismantles the earlier created channel.
T̲r̲a̲n̲s̲f̲e̲r̲ ̲d̲a̲t̲a̲
To terminal
Depending on terminal type, the procedures insert
specific terminal codes and transmit the codes
and data to the terminal via the I/O system.
From terminal
Data received from the terminal is returned to
calling module.
C̲o̲n̲t̲r̲o̲l̲ ̲s̲c̲r̲e̲e̲n̲
The procedure is only used to VDU terminals. The control
information (e.g. clear screen, address cursor, part
page mode) is converted to specific VDU codes, and
transmitted to the terminal via the I/O system.
W̲a̲i̲t̲ ̲o̲p̲e̲r̲a̲t̲i̲o̲n̲
The procedure is used to wait for an earlier initiated
transfer call, or to wait for an AMOS message from
the PSM (Block, unblock).
S̲e̲n̲d̲ ̲A̲M̲O̲S̲ ̲m̲e̲s̲s̲a̲g̲e̲ ̲t̲o̲ ̲P̲S̲M̲
the procedure assembles a standard message and sends
it to the PSM.
4.3.3.3.4 E̲r̲r̲o̲r̲ ̲M̲o̲d̲u̲l̲e̲ ̲(̲E̲M̲)̲
The EM supports the other modules in the ITM part of
the terminal process when error codes shall be sent
to the terminal or when alarms shall be sent to the
local mede supervisor.
The error codes could give the following information
to the operator:
Syntax fault
Fault prompt response
Resource problems
I/O fault
The alarm is sent when:
Fault authority
Fault SH password
Fault password
4.3.3.3.5 V̲D̲U̲ ̲H̲a̲n̲d̲l̲e̲r̲ ̲M̲o̲d̲u̲l̲e̲ ̲(̲V̲D̲U̲H̲)̲
The VDUH consists of procedures called by the TIOM
and PSM when control data or text data is sent to VDU
terminals.
The VDUH procedures are:
1. Transmit screen text.
2. Transmit control codes.
Transmit screen text.
The procedure insert screen control codes before
and after the text, and sends the codes and text
to the VDU terminal.
Transmit control codes.
The procedure converts the input control parameters
to specific VDU dependent control codes and sends
the codes to the VDU terminal.
4.3.3.3.6 I̲n̲t̲e̲r̲a̲c̲t̲i̲v̲e̲ ̲T̲e̲r̲m̲i̲n̲a̲l̲s̲
The following devices are defined in the FIKS interactive
environment.
- VDUs with connected Receive only printers
- Teleprinters
- Paper Tape Puncher
- Paper Tape Reader
Terminal services are summarized below.
a. A VDU with a RO printer must be handled as 3 separate
units operating simultaneously
1. Interactive keyboard/screen VDU controlled
by the ITM.
2. Non-interactive 3-top line controlled by the
ITM.
These lines contain the queue status lines,
and are updated each 60 seconds.
3. Non-interactive RO terminal controlled by a
print process.
b. A teleprinter (Keyboard-send-receive) is alternately
handled as an interactive keyboard entry device
under control of the ITM, and as a RO device controlled
by the print process.
The queue status is printed before each "PROC",
and each 60 seconds when the terminal is idle (logged-on
but not active).
c. A paper tape punch is handled like a non-interactive
RO terminal, which is always logged-on.
d. A paper tape reader is handled like a non-interactive
input device, which is always logged-on. The device
is fixed allocated a specific VDU terminal.
4.3.3.3.7 T̲e̲r̲m̲i̲n̲a̲l̲ ̲O̲p̲e̲r̲a̲t̲o̲r̲s̲
Three categories of terminal operators are defined
namely:
- The N/M Supervisor
- The N/M Supervisor Assistant
- The Message Preparation Operator.
T̲h̲e̲ ̲N̲/̲M̲ ̲S̲u̲p̲e̲r̲v̲i̲s̲o̲r̲
The N/M supervisor is the master operator at the MEDE.
He will be able to use all types of procedures available
in the MEDE including special security procedures.
The supervisor may only log on as such on terminals
having supervisor classification. A supervisor is identified
as such through his security profile on the USP file.
Only one supervisor may be active at a given time.
T̲h̲e̲ ̲N̲/̲M̲ ̲S̲u̲p̲e̲r̲v̲i̲s̲o̲r̲ ̲A̲s̲s̲i̲s̲t̲a̲n̲t̲(̲s̲)̲
The N/M supervisor assistant(s) are operators with
supervisory classification. They may execute all types
of procedures available at the MEDE except security
profile handling. The supervisor assistant may only
log-on as such at terminals having supervisory classification.
Only two supervisor assistants may be active at a time.
T̲h̲e̲ ̲M̲e̲s̲s̲a̲g̲e̲ ̲P̲r̲e̲p̲a̲r̲a̲t̲i̲o̲n̲ ̲O̲p̲e̲r̲a̲t̲o̲r̲
The message preparation terminal operator will be able
to use procedures associated with the message handling.
Before a terminal user is granted access to the MEDE,
he performs a log-on procedure. In the response to
prompts from the PSM he supplies a user-id and a log-on
password. From this his security profile is found (held
on disc) and checked. The security profile also contains
his claasification, which is the classification he
gets on the terminal.
All operators can operate from any terminal on the
NODE/MEDE with the classification stated in his user
security profile.
4.3.3.4 V̲i̲s̲u̲a̲l̲ ̲T̲a̲b̲l̲e̲ ̲o̲f̲ ̲C̲o̲n̲t̲e̲n̲t̲s̲
Figure 4.3.3.4-1 depicts the groups of function that
the ITM is designed to provide. The functions are supported
by the modules depicted.
Figure 4.3.3.4-1
ITM Subsystem, Visual Table of Contents
4.3.3.5 S̲u̲b̲s̲y̲s̲t̲e̲m̲ ̲O̲v̲e̲r̲v̲i̲e̲w̲ ̲H̲I̲P̲O̲ ̲D̲i̲a̲g̲r̲a̲m̲s̲
Figure 4.3.3.5-1 to 4.3.3.5-2.2 shows the overview
functions, which have to be implemented in the ITM
subsystem.
Figure 4.3.3.5-1
ITM Subsystem, HIPO Diagram
Figure 4.3.3.5-2.1
ITM Subsystem, HIPO Diagram
Figure 4.3.3.5-2.2
ITM Subsystem, HIPO Diagram
