DEAR MR(Sanitized)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A001600020053-5
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 6
• Document Creation Date: December 28, 2016
• Document Release Date: April 19, 2000
• Sequence Number: 53
• Publication Date: January 4, 1964
• Content Type: LETTER

Approved For Release 2000/06/07 :CIA-RDP78B04747A091600020053-5
Declass Review, NIMA/DoD
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Approved For ~elease 2000/06/07 :CIA-RDP78B04747A001600020053-5
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 Approved For Release 2000/06/07 :CIA-RDP78B04747A001600020053-5
4 Januar~- 194
Ccaulci ~u please provide us wf#h the cable c~annes#ar c~dertn~ infvrma#ian
may purchase the matir-g cvnne~ctar.
~# is cwr understandir~ that na twc~ wires of any ~-~' the twisted pairs are #cr be
ce~mman at the plcstter~-nd of then cabte. ~~ #his ur~decstanding c4rrec#'~ And
in light of #his goes#ic~r,, how is p~x~raph b.'l.5 of the spe+~ifisa#it~n, referred
tc+ c~ave~ to interpret~i? Raragraph b. "1 ?~ st~x#ss that..,
"~'he d-c resin#ance of the ~rau,~c~ return fa? a cabl~+ shall n?t
exceed fJ. ~ ems ~e
Who# range Qf camman made vc~lta~+ss can be axpec#ed !a +~xiat be#vw
#wisted pair and hQUSe pr+c~tnd?
Lcu~lc~.yau pl~-ase prcr~+ide us ,nrit~h the ca~ale cc~nr~ectcr pin ~signment list.
~.rppcssed to be grounc~d~' And which ground is meant= cc~mpu#er
d"~
c
un
round, acxmpu#e~r ahc~ssls ~rcunci~ crr h+n~usa gr
y
or~,
e~di#anal lrtfcurr~ca
,such of the twisted emirs is cesmmc~n at the ccmprstear ~snd esf the cable.
ou tell us whether csr nest cane w#rer
ccsuld
tl
speclficatlan ref+~rred to abgv?~ we fend the falls~wing paragraphs:
Rara tg ?? 2.~. "ln the. #~ir~y '~erc~' eta#e, un c~t~avt circui#
~ated in ~corn~ter ar peripheral equipmen#) must
l~ ca ble of sup~i-yT a mini-mum of 3 milliamperes #o ~anX one
Input circuit in another mquipm?nt."
andfi
1'c,~assraph rS.~.S~. "then line mus# #~ #ermina#~-d in lt5 characteristic
impedance sa as #Q event re~flec#inn."
t to campy with the two reaquiremen#s stated '+ ctbovea
ttem
p
~~ {.~~ a
p~~raphs, which cm #ha surface wawld seerri #o be contradicter we
west the fQllswing interconnection scheme:
Approved For Release 2000/06/07 :CIA-RDP78B04747A001600020053-5
 Ap~?r~r~~l?For Relea000/p6/07 ;CIA-RDP78B04747A00100020053-5
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Approved For Release 2000/06/07 :CIA-RDP78B04747A001600020053-5
 Approved For Relea,~2000/06/07 :CIA-RDP78B04747A00'~,D020053-5
#s P~~ ~~ ~ ~~ nprat ~rnp~nce ' ~h ?~f 3~ ~r~p~a~ a c-r~~s~#s
{~rrh~eh r+~it~ ~r~axe ~~ t+a ~ine5 ~ tha ~~~'~ ~~t.~i CK~i~fvt~
O~r~~, to ~~r~at~ thcr~ ~ 1, ~ ~ to i~~ntt cwr+~ ~ ~~ ~~ch
~~ }~ l~r~~ tt~ t~ tF~c~ ~ ~~~t+p~r+~< ~~p~~~~#~t11y, ~vc~ t~ttnct t+~ ~t
tmetety ~4, cahm~< }
#~ ~~ chara~tra~rtsti~c 1~~~~ ~# a ~t ~s ~rr+~aaub~+~c#~:y l~vv~? #hc~
~1~~ton at 1~e p1~#~er e~ of tir~a rv~~~ ~~ n~ ~s
if i~h~x sclt~e ~~ ~~pt~le a~c#~ar i~` r ~esrstc~d~s~~i ~a +c~:~
we ~raald d~a~gn # output Jrnpeck~-~e s~sr e~tpu~ a~npt~~~r which
~?UtFtlT t~A'SA R~~U~~T ~~r~s ~ m~o-lch ~~ercctear~~#-~c trr~p~d~m~e
~f~~ct~~~ fr~n ~~ ca~puter t~,rmin~~ w~ul ~~ ~+~ cor~seyu~n~
rd ~si~e~ th~~ ~~~f~er ~~ thct ~ ~~nt~-~.tr~~ irnpeance,
txe #~- the ~rthec err a silo tw$s~+~d ~~, w~sul
he ptQtt+~ i~ tutn~d ~~ ~~ ~c~xce wi#h
cph ~