https://declassified.library.utoronto.ca/files/original/01c9d9a01d5c38c2eeeb2fa01c55dcaa.pdf f5c92f5c9e9e27e79a6cb7c976361389 PDF Text Text Document.dis_Jos£(punder the Access to Information Act • /Fowfirtent divulgue iMHvertu de la Loi sur I'acces a finformat xformation LlffYy ' * r - / ^ yy ft:/ l R i «i T ft I % WL§ U '216-4 ACP 121 Cl2l/8(DCom) MEMORANDUM 16 Got 63 Ref^.)CJT 11-10-375-49 A . I . C-121/8 22 May 63 (E Chairman MPSC ACP 121 - Communication I n s t r u c t i o n s General Message Precedence Categories ^-^ fjy 1 This HQ has noted the following item appended to t h e Minutes of the 135th Meeting of t h e fiAK S i g n a l s T r a f f i c Committee. "4 GCHQ (Government Communications HQ) h a s agreed t h a t t h e B r i t i s h S i g i n t oommunioations network must oonform to -the new U . S . system for the f o l l o w i n g r e a s o n s t (a) I t i s i n t e g r a t e d with t h e U . S . C r i t i c a l I n t e l l i g e n c e oommunioations network (CUTI :.,:•• )# some 6by of a l l t r a f f i o handled b e i n g of 0 . 8 . o r i g i n or f o r r e l a y i n t o t h e U . S . network. (b) Without conformity confusion would r e s u l t a t both and t r a f f i c h a n d l i n g l e v e l s . (c) Less than 1% of B r i t i s h Slgia,t t r a f f i o , i n encrypted form, i s c a r r i e d on U.K. .^ervioe o h a n n e l s , t h e r e n » i n e j _ ^ / b e i n g c a r r i e d on e x c l u s i v e c i r c u i t s / c h a n n e l s . (d) During the p a s t deoade S i g i n t t r a f ' i o precedences have beoome devalued to the e x t e n t t h a t PKICftlTY has a l m o s t become the normj the r e v a l u a t i o n e f f e c t e d by the U. . system i s d e s i r a b l e because i t w i l l r e s t o r e the precedenc remaining i n use t o near p a r a t y w i t h o t h e r B r i t i s h u s a g e , (e) Conformity would i n any case beoome n e c e s a a ry b e f o r e l o n g , f o r r e a s o n s of automation whioh a r e now m o t i v a t i n g the Q.I staff 0 2 From t h e f o r e g o i n g i t would appear tiiat the U.K. comments r e c e i v e d under Reference ( a ) . GCHQ had no i n p u t to (AM MaoKenzie; RCAF Member I 2-6149 oo RCN Member MPSC Array Member MPSC tyu lY^Y <y y " • M y , 000154 � Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Hydra Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context HY00177 Title A name given to the resource ACP 121 - Communication Instructions General Message Precedence Categories Date A point or period of time associated with an event in the lifecycle of the resource 10/16/1963 Source A related resource from which the described resource is derived Hydra Communications - Policy, RG24, 1250-36 Vol. 2, Library and Archives Canada (LAC) Creator An entity primarily responsible for making the resource Department of National Defence Rights Information about rights held in and over the resource Canadian Crown Subject The topic of the resource ACP 121, communication standards Description An account of the resource Memorandum from A.M. Mackenzie (RCAP member, MPSC) to Chairman, MPSC, Army member, MPSC pertaining to GCHQ agreement to conform to U.S. message precedence standards. Publisher An entity responsible for making the resource available Canada Declassified Type The nature or genre of the resource Text Format The file format, physical medium, or dimensions of the resource PDF Language A language of the resource en