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⟦504b84d25⟧ Wang Wps File
Length: 3067 (0xbfb)
Types: Wang Wps File
Notes: ECP No. 009
Names: »1043A «
Derivation
└─⟦d10d3ed68⟧ Bits:30006014 8" Wang WCS floppy, CR 0055A
└─ ⟦this⟧ »1043A «
WangText
…02…CPS/ECP/009
…02…BHB/810611…02……02…#
OPTION FOR EXCEEDING 1 MA ON CAMPS I/F CABLES
…02……02…CAMPS
1̲ ̲ ̲P̲R̲O̲P̲O̲S̲E̲D̲ ̲C̲H̲A̲N̲G̲E̲:̲
Extend the worthing of CPS/210/SYS/0001 Section 3.4.5.1
d) to include the following:
In special cases where a line current of more than
one milli-ampere is felt necessary then the ontractor
must submit his specific proposal for approval by ACE
COMSEC.
The revised section 3.4.5.1 d) will then be (including
proposed change):
3.4.5.1 d) All electrical interconnections for data between
the equipment will use low level keying systems,
i.e. 6-0-6 volts at currents less than one milli-ampere.
All the remaining control lines should conform
to CCITT Recommendation V28.
In special cases where a line current of more than
one milli-ampere is felt necessary then the contractor
must submit his specific proposal for approval
by ACE COMSEC.
In the following a short summary of the discussions
between CR and SHAPE leading to the ECP, is presented:
1) The CR proposal is based on the IFB requirement
that the electrical specification on channels to
terminals and external circuits shall be according
to CCITT recommendation V24/V28. The recommendation
V28 is used for cable lengths up to 50 feet.
2) During the early CAMPS Progress meetings it occurred
that the cable lengths would exceed 50 feet in
a number of cases in the sites. It was pointed
out by CR that here we had a problem area. The
problem was discussed, and no solution was found
to eliminate the problem.
References:
a) CAMPS PMOM 2 (19/20 June 1980 Section 14)
b) CAMPS Site Equipment, drawing No. 1-152, Issue
1.
3) In the meeting at CR in October 80, where the Tempest
Solution including the use of EMI-racks was discussed,
it was pointed out by Mr. Philip Becker from CR's
Tempest Consultant (Atlantic Research Corporation,
ARC) that a driver/receiver circuit allowing for
cable lengths exceeding 50 feet (up to 900 feet)
was known by ARC. ARC's experience was that this
circuit could be used in Tempest installations,
even if it could not meet the 1 mA-requirement
of the CMAPS SRS (see above).
It was decided that CR/ARC should furnish ACE COMSEC
with a rational on this driver/receiver concept
in order to make it possible for ACE COMSEC to
judge if this was a way to eliminate the 50 feet
problem area.
Reference:
a) CAMPS MOM, CAMPS Meeting No. 2 30-31 Oct. 1980.
4) On a meeting at SHAPE, Mr. Philip Becker turned
over to ACE COMSEC the promised rational in INTERIM
Report No. 3.
This report was reviewed by ACE COMSEC, and it
was decided that CR should request for this actual
ECP in order to open for the improved design.
The immediate reaction of ACE COMSEC was that they
would be able to accept the design proposed in
INTERIM report No. 3 based on the revised 1 mA-requirement.
References:
a) MOM, meeting at SHAPE 810512
