https://declassified.library.utoronto.ca/files/original/2d60c45764c0f9c1cac00f51aa5d4bd2.pdf a0cae8708b4d4f9258463e4c4f91e61e PDF Text Text Document disclosed under the Access to Information Act Document divulgue en vertu de la Loi sur faeces a {'information SECRET 3.250 J£ TD"g0t;8 CD •Comm P) >0 2 7 2 3 « 2 Canadian F o r c e s H e a d q u a r t e r s Ottawa, Ontario*, / ^ Aug 6 5 Commanding Officer Ottawa Wireless Station OTTAWA, Ontario, TRANSATLANTIC COEKDilXCATIOMS HYDRA lo Enclosed are copies of the following correspondences a. Foreign Office F0B/172/61i dated 13 May 6k$ ba Foreign Office Yfl llh/10/6 e0 D Sigs reply HQTS 1250=3© dated 18 Aug 6h$ d„ Foreign Office XH HJi/29/6 dated 18 Dec 6k$ e„ CFHQ Ilessag© XOCP 851 dated 26 Feb 65$ f. Foreign Office DSYH HLh/3/G 2© dated 23 Jul. 6U| dated 11 Mar 65 Alerts Massages Pleas© note and implement agreement to transmit Alerts Messages by Telex in event failure of HF radio and DND 11922© 3<» Prime Minister to President Teletype Conversations Please note that DND 11920 is the circuit providing this facility*. In event af failure of the transatlantic cable (TATl) carrying DM) 11920, alt*imativa arrangements for Prime Minister to President teletype conversations will be arranged using whatever say be avnilableo (MBP WebberJ Colonel fc# Chief of the Defence Staff Copies tos Head of Communications Division Department of External Affairs Director Communications Bmnch National Research Council Headquarters, Canadian Forces Communication System Commanding Officer 701 Communication Squadron Commanding Officer 705 Communication Squadron SEGR&T 000052 �Document disclosed under the Access to Information Act Document divulgue en vertu de la Loi sur faeces a {'informatio \. '\'J\ .(: i. ••©'*" j * : •'.•••'•'••-•:•. '"•' "v>.;; ,••••.•••..•••. (wyi'yn ;•'•.* '-..;•:' -.. ' .'•..,-.' •'• - FOREIGN'OFFICE, s.v/.i. ' V •'.':.> ' -',':• :.--,•• May 13• 1964. .-"..'. '••-.•:• ' H>^-A The unfortunate failures of late in the trans-Atlantic cables which'culminated on Saturday last, May 9, in only the TAT 3 cable. ' surviving for a time, has caused us some concern. This was to ensure that should a "Flash" Alerts situation have arisen during the period when our joint circuit, in TAT 1 was out of service, we # should have been able to meet the reouirement by making use of the G.C.H.Q, circuit (normally in CANT AT)' which has been routed in TAT, 3 'oji.rjoe Apr! 1.^28. ' It. was to this? end that we sought and obtained • locally "the-agreement of G.C.H.^. to our taking their cable if tho 'need arose and serviced the.O.I.C. OTC Leitrim asking him to mako similar provisional- arrangementn for a awitch at your end. ; 2. In the event it .was unnecessary for ua to take tho G.C.H.Q. / circuit aince our own circit was restored after two hours." But / 0 • in view of the likely increase in the number of trans-Atlantic * ./ V/ circuits between LTC and OTC in the future, it seems prudent to '{ • 'connider the relative priorities of each circuit so routed so-' that in the.event of a failure of one or more circuit the two relay stations should be aware of any special priority commitments that must be. taken account on the circuits) surviving. 3. V/e^ have accordingly.passed this question to the appropriate , U.K. authority who will no doubt conault their Canadian and U.S.> colleaguoa as required, . , -, ,,. '•.•••• - •••'•:'• A '• /:?' :~* •'••'" •••'.-• ;'.•''-.'• ":'"•• .'=• \ ; 1 S I G S 2E?.J, (A. Routledge) Colonel P.D/ Smith,.' Royal Canadian Corps of Signals, Army Headquarters, Ottawa 4, Ontario., sTP^<y >•<*$•</. '..< ' •>?y </i.^^y : 'f•'• •; • ^ty/>^->.• *+£• ev~y S E C R E T ~ . • : >: - : — — A//£> •'> rf,lUJ.UI|f"'..!|H, • •* ' 2 #/»f*y * ^ | i^<«tini]i ...iiiill i!i.wnH- ........ <*,^ •» ~ A,\ • • :* 000053 �Document disclosed under the Access to Information Act - j .... IW.un.nt-rfiuplf n» f p •Cffl, ^f |j).l,~....r IW^f A./'^frirjn^ffan I MUWWMh, SECRET FOREIGN OFFICE, S . V / . l . YIIlla/lO/G *•* v»* f*^ »*••• *-"C 0-vv_jr_--£. . ;,. J u l y 2 3 , 196/.*. >v(^V-vv- / £ » Please refer to my letter FOB/172/6V of May-13 about .. ,' the-need to .resolve'questions of conflicting priorities for the U3e of trans-Atlantic.telegraph cable channels under breakdown conditions, 2. V.'e have now given some thought to this question In association with the United Kingdom departments concerned and the .following are the linc3 on which we are thinking. 3. •. At .the outset, I should coy that we hope, and believe,. '. that the Post .Office and C.O.T.C. would do.everything possible ' to help us meet our .urgent commitments. As you will be aware, the risk of multiple loss of channels has been minimised by .routing them, in different systems sprc.ud among the T-hrco trano•• Atlantic cables terminated in this country. In addition the - routing of channels via L.T.C. and O.T.C. ..will provide much • " needed flexibility in the event, of cable breakdowns. However, notwithstanding any arrangements which the carriers may make for restoring service, it is important to agree procedures for dealing-with periods of reduced channel -working. t . i+. .'• Y/e are firmly of the opinion that it is not possible to i.lay down an immutable set of priorities to meet all possible '' contingencies in breakdown conditions.. As you know, with the re-arrangement. of the I-.IOD London/British Embassy Y/aohington .' • cable channel there will be thrco_ Government-rented channels terminated at LTC and OTC. • Tii addition to carryjUl^—CaJaadian, .';• Foreign Office, ^inlntry of Defence London and C-CHO. and - Tripartite Alert traffic, these channels have to -provide, on. \ Call, a telecoiof«--'->'^nr»/> i -i n;rn.,rit,wnf!n -j^t I Q pxnvning Street ;avl the . V/KiTo J O UP. P.. Discussions are in progress v/Ith the Americans .*.' with a view to finding other ways, and means of providing the ; ,.Ho. 10 Downing Streot/Y/hite Hous.e teleconference facility in an emergency. In.the meanwhile we must regard a request for a _ teleconference between No. 10 Downing Street and the V/hite House ; as being of paramount.importance, all other requirements being ; • cpnsldered on their merits at the time, having regard to such • factors as:- , . , .'••-.,- (a) the relative urgency and. the extent of the requirement; (b) the availability of alternative forms of communication, to meet any of the requirements; (c) the estimated period of reduced channel working. \7e think it is quite inappropriate to j>lace the onus for deciding how best to use the remaining channels on the duty engineering staff at L.T.C. and O.T.C, since these staffs cannot be expected to know all the implications. However, it is Important that L.T.C. and O.T.C. should know'to whom they should 'Colonel P. D. Smith, I-.-I.B.E., C D . , .--. Director, . •• •':'; Royal Canadian Corps of Signals, Ottawa, o I .t'y . 1.1 j I . /report 000054 �Document disclosed under the Access to Information Act Document divulgue en vertu de la Loi sur I'acces a /'information M<m,i|i.J..^.,—^^.•---.. ,..,..:..) :• - . - v . * , , • • - - ~ ^ ^ --ftn.^^iwmtiili-.iairi-ri.M.'TiH-M-.l.tn.l.-lnlli- • ^ . W i r l - . m . r t w W r t , , •<>':- report the loss of a channel and from whom they can get instructions how to deal with the situation. The solution we have in mind, so far as the United Kingdom is concerned, is for any loss of channels to be reported by L.T.C to the Head of Shift of the Foreign Office' Signal Office. 'This officer, acting within the framework of previously agreed " • operational guidance, would then consult quickly with the Duty Signal Officer at the I.I.CD., Cub inert-Off Ice and G.C.H.Q. •'Communication Centres to ascertain the current and anticipated requirements and the state of alternative communications. These officers would, of .course, make use of their normal ' . Departmental consultative machinery, as necessary, 'or as laid down in the operational guidance. Having decided how the remaining channels should be used the Head of Shift, Foreign Office Signal Off ice, would advise the D.S.Cs and the duty engineer at L.T.C .accordingly. 'As to the nature of the oxDor.ational guidance, our present thoughts arc that this should be limited to stipulating that 20Downing street/Y/hite House teleconferences, when called for, will have overriding priorit5'' and that the No. 10 and the Joint Intelligence Committee duty officers must always be consulted before any changes in the normal channel switching arrangements are agreed to that may affect the No. 10 Downing Street/White House or the Tripartite Alert requirements,. As to other traffic, the Duty Signal , Officers should.be well aware of the amount and nature of the traffic on hand, and of the availability of alternative routes, and should normally be well able, without consulting their.operational staffs, to agree revised schedules such that all , Departments concerned could clear their traffic having regard to its precedence.. The duty Signal Officer at Canada House would be consulted as necessary. 6» The arrangements outlined at paragraph 5 could not, of course, be introduced and operated without the- full agreement and co-operation from all concerned at your end. As "— we sec it, what is required Is. for. an officer to bo nominated at your oiid with whom the Head of Shift, Foreign Office Signal 0ffi.ee, could deal as necessary, and who, in turn, would paoa any agreed instruction to the engineering staff at O.T.C and to anyone else conceited, • It is clearly imperative that the engineers at L.T.C and O.T.C should be working to the same switching schedules.. - • 7. I should be mo:it grateful to receive your informal opinion on the arrangements outlined above and, In particular, your . Views on how we can ensure the necessary collaboration on the traffic side in the event of trans-Atlantic cable breakdowns. The arrangements outlined in this letter, including -the proposed operational,guidance, will probably have to bo submitted for agreement on our side- to the Cabinet Ofi'ice Combined CommunlcattonoElectronics Committee. .It would, of.course, be made clear in the C C C . paper that the proposed arrangements'Were subject to formal agreement by your side. ^ Clcyy* 'sU-~.' Ce>i^ ^ n (A. Routledge)/ 000055 �••-"•"-•—•'••• From: -"••- . . . . - • —....^... :.-...- ... - , Document disclosed under the Access to Information Act n^DQCMflient.divulgue.en.yt^u^^Loisurracca.dn^orm^mn Colonel ?D Smith, : r> .-. . \^J..:••• '" .•,'-.: .CANADIAN FORCES HEADQUARTERS ' ..••"•",''.. '"' : ;;i':'.;.;^;Doar iT3 12G0-5G (D S l g c ) • •• /^>^ ^ , " - 4, Ontario •; /'(Pi'Aug 64- . j •':' ' ' ,'•-'-'.'• ' • T h i s i s I n r o o l y t o y o u r l e t t e r YII 1 1 4 / 1 0 / 0 ' .'' o f 2 3 r d J u l y 1004 r e g a r d i n g p r i o r i t i e s f o r u s e o f .'-' t r a n a - A t ' J a n t l c t o l e & r a p h c a b l e c h a n n o l 3 u n d e r b r e a k " d o w n conditions* - C o n s u l t a t i o n n b o u t u s e of c l r c u i t n would '.•'•'.."•" mnko d o l n y I n e v i t a b l e . Y.'e b n l i ^ v o t h i s i s u n a c c e p t a b l e . " • : ' . . i n vi^w o f the n a t u r e of ^the t r a f f i o t o bo h a n d l e d * . •..• •' ".-.-• v.'e n ^ r o n t h a t tho c u p o r v l o o r would r o p o r t l o s s of Mo c l r c u l t ( s ) to higher a u t h o r i t y , but f e e l t h a t thla . ' '.'".- s h o u l d n o t d n l a y i m m e d i a t e and a u t o m a t i c a c t i o n by '.' t h e s e n i o r t r u f f l e man a t o a c h p o i n t (London, O t t a w a , . V/aohlngtori) t o e n s u r e t r a f f i c i s ' h a n d l e d e x p e d i t i o u s l y * •/."• . Thla i s p o s s i b l e I f a g r e n n n n t la r e a c h e d now on pre<.... e m p t i n g c i r c u i t s when n e c o c s a i y i n a c c o r d a n c e w i t h ; . •••'.'.'• the following pmendoncet •'.';'••';• a* b • .". - » c* d* *. ! _ - .'''•'.- { j i I \ • "! . ' , " • - , . ' O p e r a t i o n a l Alerfco . Prime M i n i s t o r t o P r e s i d e n t T e l e t y p e o o n v o r a a t l o n s Praotico Alerts All othor t r a f f i o handled according to •'.-•• ' p r e c e d e n c e i n t h o n o r m a l manner* • **/2 3 L~ w S v* K£, P | I I | • 000056 ! �Document disclosed under the Access to Information Act Document divulgueen vertu de la Loi sur faeces a {'information tmttemimtMtuttm*m.to•/*• • yp» fr-J /j.-*. :-;-X %•>.* v?« c » 2 '•* We recognise that a. and b* are of about equal Importance. -.Vo assume that an Alorts message orlglnutod at either London or Washington would be made known to the Prime -lYlnlstor. or Precidont so that oven if a teletype conversation wore In progress the information contained in the Alert would probably bo included In the conversetion* 'There would thus be no need to pre-empt. However, wo have placed operational Alerts first to protect tho'heed .for Car.mda to break into-a teletype conversation.with an Alerts message If .this Is considered necessary.* •Wo nominate the' Supervisor OTC to bo your point of contact. Providing there is njvre/mnnt . bntv/'ien I'.bo London one ..'anhln • ton terminal a, he would bo capable of making wh.nl.ovor switching arrangomerits were necodaury. lio would, of course, have hl.'j inatructlonr, an to whom to notify at Ottawa concerning changes in circuits, but those pooplo need not be consulted If the above proposal concerning pre-emption of circuits la egroed* • / W-U»v—^ ttr A Uout3edga Room 100 F o r e i g n Offioo London S'.V 1 -ENGLAND JAA/wjm $T> ^k.C fit. 5 000057 �m* bcument disclosed under the Access to Information Act mmT5 Document divulgue en vertu de la Loi sur I'acces a I'informati in SECRET FOREIGN OFFICE, S.Y7.1, YH . 1 1 4 / 2 9 / 0 . December 1C, 19&+* ) - I am sorry to have been >o long In replying to your letter .'reference H.Q. i.T.S. 1250-36(D. Sigs.) of August 18 about priorities for the use of transatlantic cable telegraph channels under breakdown conditions. This has been due to the necessity for .the Government Signal Planning Staff to. obtain the reactions of the other United Kingdom Departments concerned to your .proposals and then to obtain'the endorsement of the Combined •Communications Committee. 2. . We have only one minor reservation as regards your proposals, namely in the matter' of Practice 'Alerts. It is our view that it would be bad security and also seriously reduce the value of such tests- if the. handling of practice Alerts traffic by signals •'X>ersonnol was subject to different arrangements from those for an Operational Alerts message. Accordingly we would regard the three separate uses to which channels are put, in order of precedence as:-. . . (a) Tripartite Alerts traffic (i.e. both operational and practice). (b) The Prime Minister to President link. • •';. (c) All other traffic handled according, to precedence. Subject to the foregoing reservations, the Combined Communications Committee has endorsed the prox'osed arrangements, ,, '3»' . You Y'ill appreciate that as regards .'ordinary* traffic your d. - the nominated traffic man,in London wi11 have no 'alternative but quickly to consult the duty signal officers at the other U.K.CommunicationCentres concerned.because some of our channels carry "on-line" encrypted traffic. On these channels the precedences being handled at any time are known only to the two terminal officers concerned. ._ 24-* Y/e note that you have nominated the Supervisor, 0«T;C, to • be the Canadian point of contact. The United Kingdom contact Officer will be the Head of Shift, Foreignf Office Signal Office . '(Telex Ho. 2*4.961, Identity 'PRODROME LOH, or via service meaaagev through O.T.C/L.T.C or Telephone 'Whitehall 8I4J-1.O, Extension 137). The latter officer will.be responsible for ensuring that action at the United Kingdom and Washington terminals is co-ordinated as necessary, 5* It Is suggested that,if you agree, the proposed arrangements should be effective from 12002 on February 1, 1965. /, y r" (A. Routledge) ' Colonel P. D.Smith, H.3.E., C.D., ' Director,: . Royal Canadian'Corps of Signals, _Ottawa* ' -.SISCRK'J; • "•-. 000058 �Document disclosed under the Access to Information Act Document divulgue en vertu de la Loi sur faeces a {'information I!QB 1 2 5 0 - 3 6 TD 501.8 (D Coon P ) BEST AVAILABLE COPY Z / Feb 6 £ ROUttnB CAIJCRCErJD F0REIGH O F F I C E LOHDOW IUGLAND XOCF 8SL lo FOR HR A ROUTLEDGE DIPLOmTIC SERVICE ADIHIilSTRATI FRon COL S i n n , FORCES HQ, 2„ DIRECTOR OF ecu JUDICATIONS EGE PLANS, CAWIAW OTTAWA* REF YH U J . / 2 9 / 6 DATED 1 8 DEC 6k AH) PREVIOUS CORREL- FOR HAUDLINO TRIPARTITE ALERTS IIESSAGES I F CIRCUIT 1 1 9 8 4 HI TAT CUE CABLE 35 OUT OF ACTION* 3o UNDER YOUR PROPOSAL AS IEDIFIED THE rROCEDUBS I S TOjARRAHBB TO INTERRUPT ONE OF THE OTHER DEDICATED CABLE CIRCUIT i»« THE FUNDAIETiTAL PROBLEM MOT COVERED HI PRCP03AL3 TO DATE IS TO ENABLE LTD AND OTC TO TALK TO EACH OTHER IH ABSENCE OF TAT ONE Of CRT-lift TO DECIDE blilCJ OTHER D^DICATX- CIRCUIT TO INTERRUPT 1000059 �Document disclosed under the Access to Information Act Document divulgue en vertu de la Loi sur faeces a {'information BEST AVAILABLE COPY NOTING THAT THESE CIRCUITS ARE PATCHED THROUGH OTC AID LTC TO OTHER SUBSCRIBERS AND USING ON-LINE C I 3 E R * 5 , THE 3IEPLE5T WAY TO PROVIDE THIS ESSENTIAL OJTSRCOi.*NECTION BETWEEN OTC AND LTC IN THESE CIRCUMSTANCES SEEI-fc TO BE TO USE TELEX ALREADY INSTALLED. 6 „ PROCEDURE ON RECEIPT OF WARNINO BY EITHER OTC OR LTC OF AN ALERT lESSAGE WHEN TAT CNE CADLE AMD THEREFORE CIRCUIT X19& ARE OUT OF SERVICE WOULD BE FOR riJITIATri.'C TRAFFIC CENTRE I^EDIATELY TO XTADL3SH TELEX CONNECTION WITH OTHER TRAFFIC CENTRE, 7 , WE ARE INFOftllLS DY TELEX S U P P L l J THAT TELEX DSTL-hEN XHTuEAL AND DON IS N C R i m X CARRIED IN CANTAT BUT THAT lOittVLAL OPERATOR 1000060 �Document disclosed under the Access to Information Act Document divulgue en vertu de la Loi sur faeces a {'information ORIGINAL NOT CLEAR 80 USED TO PASS THE AL \T AL 10» HOWEVER, I F ALL CASUS CABLE CIH M Ail (000061 �ORIGINAL NOT CLEAR H o WE ARE NOT FAMILIAR WITH ROUTING OR OTHER ARRAJXE:X3ftS| FOR PRIMS MDflST IDSNT TELEPRINTER ComXZi.CZ COMSSCTIOtB BUT PRESUME THESE INVOLVE SPECIAL EXTENSION COIJNSCTIONS ON 120 DEDICATED CIRCUITS AND OJCLUDE ON-LINE CIPHERC If PRESUMABLY 35 CABLE iJOKRLLY USED FOR PRIME JUNISTLR TO IHSS3D2NT TELEPRINTER CONFERENCES IS OUT OF SERVICE, TRANSFER TO SOME OTHER. CIRCUIT MIGHT NECESSITATE SWITCHOIG AT BOTH LTC AND 0TC o IN THESE CIRCUMSTANCES INTEacOMMUiilCATlON BETWEEN OTC AND LTC I S AGAIN ESSENTIAL AM) I F AT THIS TIME TAT ONE CARRYING CIRCUIT 1 1 9 2 2 WERE OUT OF SERVICE TELEX WOULD HAVE TO BE USED TO PASS SWITCHING INSTRUCTIONS., I S THERE AMY SECURITY PROBLEM I N USING 000062 �Document disclosed under the Access to Information Act Document divulgue en vertu de la Loi sur faeces a {'information \ i TELEX FOR THIS? 1 3 a REQUEST YOUR COMT-EMTS ON THESE TWO POINTS FIRSTLY USE OF TELEX FOR PASSING ALERTS OR PRACTICE ALERTS I F NORMAL TAT CNE CIRCUIT U 9 2 2 IS OUT OF SERVICE AND SECONDLY USE OF TELEX FCC SETTDJQ UP PRIME MINISTER TO PRESIDENT TELEFRII1TER COHERENCES I F YOUR NORMAL IJOUTE FOR THESE IS EITERRUPTED. U,« Y.'E WILL THEN PROCE2) TO CONSULT AFFECTED US MB THIS EM). l 5 o NOTE NEW AFP0UJTM2NT NAME RESULTINC FRO! I CANADIAN SERVICES IMTEGRATICNo COLONEL SMITH AS DIRECTOR OF COIEIUNTCATICNS PLANS 35 STILL RESPONSIBLE FOR HYDRA* ADDRESS FOR MESSAGES CANFORCEHED WITH TEXT COMMENCING i t * DIRECTOR OF COUt PLANS (W»Ho F i n c h ) L t C o l D C a m P2 foW£&j 20ji7/> Cam? 1000063 �Document disclosed under the Access to Information Act &rli1lBi<.r<W'riff ttftrt ,.«<*•" ,wfliid* •i^td^-auj;.-. f1 .:.--.,., r..pqc.um^"tdiv»!gueeT"^ /} SECRET FM FOREIGN OFFICE .MAR n / 6 5 K/i <• ^ y SECRET . TO EXTERNAL OTTAWA k ROUTINE ONE OF TWO' ' • FLEASE PASS FOLLOWING TO CANFORCEHBD FOR DIRECTOR OF COMM. FLANS. BEGINS.' -. . ' . ' • • , .-...'' - ' '•;.- BSYHH'i/3/G. FOLLOWING FROM ROUTLEDG.E £ S A 0 . YOUR TEL NO XOCP S51 OF 2 6 FEBRUARY. GIVEN THE AVAILAEILITY OF THE HYDRA HF RADIO CIRCUIT WHEN ' CIRCUIT 11922 IN TAT ONE WAS OUT OF ACTION WE SHOULD EXFECT LTC AND OTC TO LIAISE VIA HYDRA AND FOR TRIFARTITE ALERTS MESSAGES TO B.F TRANSMITTED VIA THIS CIRCUIT. 2. IF THE HYDRA HF RADIO. CIRCUIT AND THE CAPLF CIRCUIT IN TAT ONE WERE OUT OF ACTION. SIMULTANEOUSLY THEN WE AGRFE THAT TELEX SHOULD-PE USED TO ENAELE LTC AND OTC TO TALK TO EACH OTHER, AND FOR THE TRANSMISSION OF SERVICE MESSAGES PETWEBN THE DSO AT LTC AND THE HEAD OF SHIFT ON THE COMPINED FO/CRO SIGNAL OFFICE.' • 3o THE MINISTRY OF DEFENCE, LONDON/PRITISH EMBASSY WASHINGTON 'CABLE CIRCUIT IN TAT ONE PROVIDES THE PRIME MINISTER TO PRESIDENT TELECONFERENCE FACILITY. U O r > * C ' , . ' ' SECRET i\\^m»^m!ff'i^mmm»^mmmm^m^m^^H'',m^mM^m^mmmmmm^mmmmmm^ JiW—» •!.• i.Ji1wp^jiWiyi«i|,jiLitjiMim*ywW ' IW»iWN!L '» ' J ."'.I- HW I 000064 �Document disclosed under the Access to Information Act Document divulgue en vertu de la Loi sur I'acces a TinformatiA ,, •!,*•• • «,.., .-„..,., i ..,., - „,--**—~^~.—.....^^.a^^;^,. : , ........... SECRET ' •'•' PAGE TWO AND FINAL k THE FACILITY I S AVILABLE ON DEMAND EY SWITCHING THE CIRCUIT j FROM THE MINISTRY OF DEFENCE TO THE FRIME MINISTER'S OFFICE AT j 1 • THIS END AND FROM THE BRITISH EMPASSY TO THE-WHITE HOUSE . / IN WASHINGTON,, IN THE EVENT OF THE LOSS OF THIS CIRCUIT, AND A CONSEQUENT NEED FOR LTC AND OTC TO TALK TO EACH OTHER EY TELEX TO ARRANGE AN ALTERNATIVE ROUTING, IT SHOULD PF FOSSIBLF TO DO SO WITHOUT EXPLICIT REFERENCE TO THE "PRIME MINISTER/PRESIDENT* LXNKo TELEX COULD NOT ITSELF BF USED FOR FRIME MINISTER/PRESIDENT , TELECONFERENCES, J Ho WE AGREE ALSO THAT IF LTC OR OTC WARNED THE OTHER BY TELEX OF •'-; AN IMPENDING ALERTS MESSAGE, THIS MESSAGE COULD BE TRANSMITTED . EY TELEX* 5V.GPO CONFIRM THAT TELEX FROM LONDON HAS ALTERNATIVE ROUTES IN THE EVENT OF BREAKDOWN. ENDS* ' ;•• • 1222 ' • ••' ' :••'"' . MAR -•65 •: SECRET 000065 � 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 HY00280 Title A name given to the resource Transatlantic Communications Hydra Date A point or period of time associated with an event in the lifecycle of the resource 08/13/1965 Source A related resource from which the described resource is derived Fixed Communications - Hydra Telegraph Relay System - Relocation of Hydra - Plans and Policy, RG24, S-2723-2, Vol. 1, 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 Emergency planning, Emergency communications, Telex, transatlantic cables, radio communications, teletype lines, Tripartite Alerts Description An account of the resource Series of correspondence forwarded by M.H. Webber to Commanding Officer, Ottawa Wireless Station, copies to Head of Communication Division, Department of External Affairs, CBNRC, HQ CFCS, 701 Comms Sqn, 705 Comms Sqn. Bulk of correspondence is between Alan Routledge, Foreign Office UK and P.D. Smith, D Sigs, pertaining to transatlantic cable facilities used for Tripartite Alerts traffic and teletype conversations between 10 Downing Street and the White House. Webber recommends that Alerts messages be transmitted by Telex if DND 11922 circuit and HF radio fails. Should DND 11920 fail (the White House/10 Downing Street teletype circuit), any other means available should be used to establish White House/10 Downing link. 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