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⟦3bc9adf56⟧ Wang Wps File
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Notes: CPS/TCN/078
Names: »5072A «
Derivation
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…02…CPS/TCN/078
…02… MP/840705…02……02…
CAMPS
LOAD TEST
…02…ISSUE
2…02…CAMPS
b) The channel capacity for channels occupied by message
printout (reception) is assumed to be 120 IA5 characters
per second.
c) The total busy second character flow rate from
a CAMPS of maximum equipment configuration will
for channels occupied by Message Reception be max.
4200 chars/second.
d) The throughput in this section is specified for
a CAMPS of maximum equipment configuration as defined
in 3.4.1.2.1.
For a CAMPS of less than maximum configuration
the throughput shall be reduced in the same way
as in 3.4.1.2.2 using VDUs (120 chars/s), TPs (10
char/s) and medium speed teleprinters (120 char/s).
TABLE OF CONTENTS
1 GENERAL ........................................
4
1.1 PURPOSE ....................................
4
1.2 APPLICABLE DOCUMENTS .......................
4
2 EXTRACT FROM CAMPS SYSTEM REQUIREMENTS .........
5
3 CALCULATION OF LOAD ............................
12
3.1 VDU LIMITATION .............................
12
3.2 CONNECTIVITY LIMITATION ....................
13
4 CONCLUSION .....................................
14
1̲ ̲ ̲G̲E̲N̲E̲R̲A̲L̲
1.1 P̲U̲R̲P̲O̲S̲E̲
This document contains a calculation of a reduced load
as specified in the CAMPS System Requirements for a
busy hour and the basis for this calculation.
1.2 A̲P̲P̲L̲I̲C̲A̲B̲L̲E̲ ̲D̲O̲C̲U̲M̲E̲N̲T̲S̲
a) CAMPS System Requirements
CPS/210/SYS/0001, Issue 3.15.
2̲ ̲ ̲E̲X̲T̲R̲A̲C̲T̲ ̲F̲R̲O̲M̲ ̲C̲A̲M̲P̲S̲ ̲S̲Y̲S̲T̲E̲M̲ ̲R̲E̲Q̲U̲I̲R̲E̲M̲E̲N̲T̲S̲
The following extracts from the CAMPS System Requirements
forms the basis for calculation of the message load
for the load test part of the In-Plant Software Test.
3.4.1.2 M̲e̲s̲s̲a̲g̲e̲ ̲T̲r̲a̲f̲f̲i̲c̲ ̲T̲h̲r̲o̲u̲g̲h̲p̲u̲t̲
3.4.1.2.1 G̲e̲n̲e̲r̲a̲l̲
a) The equipment of the maximum configuration shall
be capable of handling traffic simultaneously on
the connected channels.
b) Requirements in this document on throughput and
response time are in effect only when no channel
is loaded more than 0.7 erlang (busy hour average).
c) The channel capacity used to calculate the channel
load is as specified in 3.4.1.2.2 - 3.4.1.2.8.
d) Channels used in operator communication with computer
are assumed to be idle 60% of the time due to operator
keying and loaded by the transmission to computer
or computer response 40% of the time.
e) The arrival distribution of requests for transmission
on channels where requests are queued is a Poisson
distribution with a mean corresponding to busy
hour load.
f) The arrival of requests for transmission on channels
where requests are not queued (e.g. operator interactions)
is assumed to be randomly distributed within the
time the channel is not occupied.
g) Peak load on channels shall be equal to busy second
load.
h) Stand alone teleprinters (i.e. medium speed and
low speed teleprinters) shall be sufficiently manned/open
for output to avoid exessive queing of messages
and other items for print out.
i) Terminal positions shall be sufficiently attended
and the user shall remove messages and other items
queued sufficiently fast to avoid excessive queing
of messages and other items.
j) Sufficiently manned/attended and sufficiently fast
above means that given an allocation of SCDs to
terminal positions, given allocation of stand alone
printers to SCDs and terminal positions and given
the busy hour traffic to be distributed to the
SCDs no terminal position and no stand alone teleprinter
shall be occupied by display/print out in more
than 70%. A terminal position/a stand alone teleprinter
is occupied if one or more entries are in queue.
k) On external channels a CAMPS with maximum equipment
configuration shall at most support an equivalent
(1 equivalent message = 1500 chars) message traffic
of:
C̲r̲i̲s̲i̲s̲ ̲&̲ ̲E̲x̲e̲r̲c̲i̲s̲e̲
…02……02……02…M̲s̲g̲.̲ ̲T̲o̲ ̲C̲A̲M̲P̲S̲…02…M̲s̲g̲.̲ ̲F̲r̲o̲m̲ ̲C̲A̲M̲P̲S̲
…02…24 hours…02…3000…02……02…900…02…
…02…Busy hour…02… 600…02……02…180…02…
P̲e̲a̲c̲e̲ ̲T̲i̲m̲e̲
…02……02……02…M̲s̲g̲.̲ ̲T̲o̲ ̲C̲A̲M̲P̲S̲…02…M̲s̲g̲.̲ ̲F̲r̲o̲m̲ ̲C̲A̲M̲P̲S̲
24 hours 600 200
Busy hour 120 40
The above figures include comments from/to CCIS
& SCARS, but not VDU pages.
l) During crisis and Exercise CAMPS shall in Busy
Hours receive 30 messages from CCIS, the composition
and handling of which shall be as follows:
- 10 comments which shall each be presented on
a VDU once
- 10 messages which shall be forwarded to a release
position. (The release notification is forwarded
to the release officer)
- 10 messages which shall be presented once at
a VDU, whereafter each message shall be presented
to 5 coordinators and be subject to one edit.
Finally it shall be presented for release.
- Above 20 released messages shall give rise
to 20 x 3 presentations to VDU and 20 x 1 presentations
to printer as subject to local distribution
of outgoing messages.
- 3 of the released messages shall be transmitted
on point-to-point networks.
- 17 of the released messages shall be transmitted
on TARE networks.
m) During crisis and exercise CAMPS shall in busy
hours receive 10 messages from SCARS, the composition
and handling of which shall be as follows:
- 5 comments which each shall be presented to
a VDU once.
- 5 messages which are released and shall be
subject to local distribution and transmission
as outlined below.
- 5 messages shall be subject to local distribution
with 5 x 3 presentations to VDUs and 5 x 1
presentations to printers.
- 5 messages shall be transmitted on TARE networks
(i.e. no transmissions to Point-to-Point network).
n) During crisis and exercise CAMPS shall in busy
hours receive 60 messages from Point-to-Point networks,
the handling of which shall be as follows:
- 60 messages are terminated at CAMPS with 60
x 3 presentations to VDUs and 60 x 1 presentations
to printers (i.e. no relay traffic).
o) During crisis and exercise CAMPS shall in busy
hours receive 500 messages from TARE networks,
the handling of which shall be as follows:
- 470 messages are terminated at CAMPS with 470
x 3 presentations to VDUs and 470 x 1 presentations
to printers.
- 30 messages which are released shall be subject
to local distribution and transmission as outlined
below.
- 10 of the above messages shall be subject to
local distribution with 10 x 3 presentations
to VDUs and 10 x 1 to printers
- 25 of the above messages shall be transmitted
to CCIS
- 5 of the above messages shall be transmitted
to SCARS
p) During crisis and exercise CAMPS shall in Busy
Hours receive 45 VDU PAGES for update of max. 300
pages stored at CAMPS as follows:
- 30 pages from CCIS
- 15 pages from SCARS
q) Messages transmitted via Point-to-Point networks
shall in average result in 4 separate transmissions.
For messages transmitted via other networks the
average is one transmission.
r) During Peace Time there is the same relative distribution
of message types and their handling as for crisis
and exercise situations.
s) Busy minute traffic flowrate is 2 times the busy
hour traffic figures for outgoing traffic and applies
to message traffic flow from start of release until
dispatch of message.
t) Busy minute traffic flowrate is 3 times busy hour
traffic figures for incoming traffic and shall
apply to message flow until first storage of messages.
u) On all channels a CAMPS with maximum equipment
configuration shall support a busy second throughput
of 7140 character/s from CAMPS and 1615 character/s
to CAMPS.
v) For CAMPS sites with less equipment than the maximum
configuration the throughput requirements shall
be reduced accordingly.
x) The maximum CAMPS site is defined assuming the
wired capacity in section 3.4.1.7 for the SHAPE
SITE.
The maximum CAMPS site has a maximum input/output
of:
NICS TARE (6 channels) ....... 750 char/s
CCIS ......................... 240 char/s
SCARS ........................ ̲2̲4̲0̲ ̲c̲h̲a̲r̲/̲s̲
............................. 1230 char/s
y) In configuration with 4 NICS TARE channels:
NICS TARE 4/6 x 750 ........... 500 char/s
CCIS ......................... 240 char/s
SCARS ......................... 2̲4̲0̲ ̲c̲h̲a̲r̲/̲s̲
.............................. 980 char/s
z1) Throughput figures for maximum CAMPS site in terms
of max. character flow rates for TRC and Point-to-Point
networks. Refer section 3.4.1.2.2q and section
3.4.1.2.6.
z2) At a non maximum configured CAMPS the figures for
throughput in this section shall be reduced accordingly
(e.g. for 4 NICS TARE Channels equipped by 980/1230).
3.4.1.2.2…02…M̲e̲s̲s̲a̲g̲e̲ ̲P̲r̲e̲p̲a̲r̲a̲t̲i̲o̲n̲ ̲a̲n̲d̲ ̲R̲e̲l̲e̲a̲s̲e̲
a) The busy second character flow from/to a CAMPS
of maximum equipment configuration employing formats
applicable to messages not yet released shall never
exceed:
…02… To CAMPS ....................... 200 Chars/sec
…02… From CAMPS ..................... 1400 Chars/sec
b) A comment will in average be of 69 characters excluding
heading information.
c) During crisis and exercise 60 messages shall be
prepared in busy hours at CAMPS VDUs.
d) The above 60 messages shall in average be sent
for coordination once with 2 addressees (= 2 copies).
e) Above 60 messages shall in average be edited once.
f) 2 comments are generated in average per message
above.
g) Additionally 10 comments are generated in connection
with coordination of CCIS originated messages.
h) The above 130 comments are subject to 130 x 1 VDU
presentations.
i) During crisis and exercise busy hours traffic flow
figures for comments prepared additionally for
transmission to SCARS and to CCIS are negligable.
j) Comments shall in average be subject to 0.5 edit.
k) With addition of 60 messages entered via OCR to
the 60 messages drafted from VDUs a total of 120
messages originated from CAMPS shall be subject
to local distribution with 120 x 3 presentations
to VDU and 120 x 1 presentations to printers.
l) A total of 125 messages (60 from VDUs, 60 from
OCR, 5 from PTR) generated locally at CAMPS shall
during crisis and exercise busy hours be transmitted
via Point-to-Point networks (18 messages, each
with 4 separate transmissions) and TARE networks
(107 messages with one transmission each).
m) Messages will in average be subject to 1.2 presentations
for release.
n) During crisis and exercise busy hours traffic flow
figures for VDU pages prepared at CAMPS for transmission
to CCIS and SCARS are negligable.
o) Maximum operator keying rate is assumed to be 10
IA5 character/s.
p) the channel capacity for transmission from VDU
to system and for system response output is 120
IA5 characters per second.
q) The throughput in this section is specified for
a CAMPS of maximum equipment configuration as defined
in 3.4.1.2.1.
Throughput requirements in this section shall for
a CAMPS of less than maximum configuration be reduced
as follows:
M̲a̲x̲.̲ ̲c̲o̲n̲f̲i̲g̲u̲r̲a̲t̲i̲o̲n̲:̲
VDU (32) 32 x 120 chars/s
TPs (incl. TRC and
Point-to-Point
circuits) 24 x 10 char/s
r) For a CAMPS with less than max. configuration the
theoretical flow shall be calculated as above and
the throughput requirements in this section be
reduced accordingly.
3̲ ̲ ̲C̲A̲L̲C̲U̲L̲A̲T̲I̲O̲N̲ ̲O̲F̲ ̲L̲O̲A̲D̲
3.1 V̲D̲U̲ ̲L̲I̲M̲I̲T̲A̲T̲I̲O̲N̲
Based on this extract from CAMPS System Requirement
it is possible to make calculation of a reduced load
which fits the actual baselined configuration of the
load test system.
First a matrix displaying the number of messages being
displayed, released, prepared, and edited as function
of the input source.
display release prepare edit
msg 6 x 10 20 10
CCIS
com 10
msg 3 x 5
SCARS
com 5
TP msg 3 x 60
TARE msg 3 x 480
msg 3 x 60 72 60 60
Local VDU
com 130 130 65
Local OCR msg 3 x 60 72
̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲
̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲
TOTAL msg…02… 2055 164 60 70 2349
com 145 130 65
340
The number of messages and comments to be displayed
on the VDUs is 2349 + 340 = 2689 equivalent messages.
Format overhead is in average 1500 chars in a receive
format, which gives a ratio of 1:2 between the number
of characters in the message and the total number of
characters.
Delta VDUs run in block mode. This protocol reduces
the efficient baudrate by 50%.
The requirements state that terminals are not loaded
more than 0.7 erlang.
These three statemets giv a maximum throughput to the
VDU of 21 chars/sec. as calculated below:
1̲2̲0̲0̲ ̲b̲a̲u̲d̲s̲ x 5̲0̲ ̲m̲e̲s̲s̲a̲g̲e̲s̲ x 5̲0̲ ̲d̲e̲l̲t̲a̲ ̲r̲a̲t̲i̲o̲n̲ x 0,7= 21
chars/
10 bit/char 100 format 100
sec.
This is equivalent to 50 messages per hour as calculated
below:
2̲1̲ ̲c̲h̲a̲r̲s̲ ̲x̲ ̲3̲6̲0̲0̲ ̲s̲/̲h̲o̲u̲r̲ = 50 msg/hour
1500 char/msg
When this is combined to the number of messages to
be displayed on 32 VDUs the maximum input load on a
maximum configurated CAMPS site is as calculated below
assuming that no message is buffered for longer time:
3̲2̲ ̲V̲D̲U̲s̲ x 5̲0̲ ̲m̲s̲g̲/̲h̲o̲u̲r̲ x 6̲0̲0̲/̲b̲u̲s̲y̲ ̲h̲o̲u̲r̲ =357 msg per
busy hour
2689 msg/hour
For a 26 VDU configuration the equivalent load is:
3̲5̲7̲ ̲x̲ ̲2̲6̲ = 290 equivalent messages in a busy hour
32 ===
This figure assumes an equally distributed load on
all VDU's.
3.2 C̲O̲N̲N̲E̲C̲T̲I̲V̲I̲T̲Y̲ ̲L̲I̲M̲I̲T̲A̲T̲I̲O̲N̲
When the requested number of messages is used on a
CAMPS site with reduced connectivity the following
calculation can be made:
MAX. NO OF ACTUAL NO OF
CONNECTIVITY M̲S̲G̲.̲:̲ C̲O̲N̲N̲E̲C̲T̲I̲V̲I̲T̲Y̲:̲ EQVIVALENT R̲A̲T̲I̲O̲
T̲o̲ ̲C̲A̲M̲P̲S̲:̲ T̲o̲ ̲C̲A̲M̲P̲S̲:̲
6 NT 500 4 333
67%
24 TP 60 16 40
67%
2 SC ̲4̲0̲ 2 ̲4̲0̲ 100%
600 413
From CAMPS From CAMPS
32 VDU 60 26 49
81%
1 OCR 60 1 60 100%
1 PTR 5 1 5 100%
NT-Relay 30 20
67%
SC-Relay ̲2̲5̲ ̲2̲5̲ 100%
180 159
4̲ ̲ ̲C̲O̲N̲C̲L̲U̲S̲I̲O̲N̲
The required load on the baselined CAMPS configuration
for the load test is to be calculated as the minimum
of the two set of equivalent message loads calculated
in section 3.1 and 3.2. This gives a required busy
hour message load of 290 messages.
