CHAPTER iil, SECTION 8 led with faster over-all service and more fully secured facilities. This circuit was used as an alternate for H&N when the normal ACAN Practically all the overseas teletype traffic at Jobsite was routed through the Army Command and Administrative Net (ACAN), via the relay stations in Hawaii, San Francisco and Eniwetok. The ACAN net enabled traffic to be exchanged with all CONUS points, including service with commercial telegraph and cable companies. A supplementary ‘through circuit”-Los Alamos to PPG-equipped with Sampson devices permitted traffic to be handMESSAGES Sent Received Relayed Services Total channels were jammed with traffic. When such messages were received at Los Alamos, they were refiled into the ACAN net for all CONUS addresses. Teletype traffic at Jobsite reached peak activity during the months of April and May. Traffic for these two months is detailed elow: APRIL MAY 2,513 2,765 3,097 555 160 6,325 3,238 1,071 148 7,222 PRECEDENCE Operation Immediate 1.7 per cent 11.2 per cent Priority 32.1 " 32.1 ” Deferred 6.7 ” 5.3 =” Routine 59.5 ” 32.1 ” CLASSIFICATION Secret Confidential Unclassified 1.7 per cent 9.7 88.6 “ ” 6.3 per cent 14.2 79.5 ” ” HANDLING TIME Incoming Outgoing Relayed Average 2.1 minutes 4.0 ” 2.2 ” 2.7 ” 2.7 minutes 5.2 ” 1.1 ” 3.0 ” 13,487 16,837 183 16,954 14,028 3,639 DAILY AVERAGE GROUP COUNT Outgoing Incoming Relayed Telecons Services Communications from the Home Office to Jobsite were one of the functional responsibilities of the Office Services Section. During the early stages of the Operation, two operators sufficed for all communications traffic, but in July 1955, an additional operator was required. On 10 February 1956, unattended teletype service was provided for the receipt of messages transmitted via the ACAN network. Messages were thus received during non-working hours and available for delivery upon the return of operators to Page 3-46 596 ° 503 215 duty. The peak of Home Office traffic was i: February 1956 when a total of 3,150 messages were handled for the month. An overseas voice channel between th PPG, Hawaii, and the ZI was first activated * December 1954 by the Armed Forces. To date, because of technical difficulties in this circuit. transmission between Jobsite and Honolulu h been only fair and between Jobsite and t! ZI, unsatisfactory; the circuit was therefore seldom. used.