"hotline", as it would come to be known, was established after the signing of a "Memorandum of Understanding Regarding the Establishment of a Direct Communications Line" on June 20, 1963, in Geneva, Switzerland, by representatives of the Soviet Union and the United States. Political criticism The Republican Party criticized the hotline in its 1964 national platform; it said the Kennedy administration had "sought accommodations with Communism without adequate safeguards and compensating gains for freedom. It has alienated proven allies by opening a 'hot line' first with a sworn enemy rather than with a proven friend, and in general pursued a risky path such as began at Munich a quarter century ago." Technology and procedure The Moscow–Washington hotline was intended for text only; speech might be misinterpreted. Leaders wrote in their native language and messages were translated at the receiving end. Teletype The first generation of the hotline used two full-time duplex telegraph circuits. The primary circuit was routed from Washington, D.C. via London, Copenhagen, Stockholm and Helsinki to Moscow. TAT-1, the first submarine transatlantic telephone cable carried messages from Washington to London. A secondary radio line for back-up and service messages linked Washington and Moscow via Tangier. This network was originally built by Harris Corporation. In July 1963 the United States sent four sets of teleprinters with the Latin alphabet to Moscow for the terminal there. A month later the Soviet equipment, four sets of East German teleprinters with the Cyrillic alphabet made by Siemens, arrived in Washington. The hotline started operations on August 30, 1963. Encryption A Norwegian-built device called Electronic Teleprinter Cryptographic Regenerative Repeater Mixer II (ETCRRM II) encrypted the teletype messages using a shared one-time pad. Each country delivered keying tapes used to encode its messages via its embassy abroad. An advantage of the one-time pad was that neither country had to reveal more sensitive encryption methods to the other. Satellite In September 1971, Moscow and Washington decided to upgrade the system. The countries also agreed for the first time when the line should be used. Specifically, they agreed to notify each other immediately in the event of an accidental, unauthorized or unexplained incident involving a nuclear weapon that could increase the risk of nuclear war. Two new satellite communication lines supplemented the terrestrial circuits using two U.S. Intelsat satellites, and two Soviet Molniya II satellites. This arrangement lasted from 1971 to 1978; it made the radio