300 - Standards For Long Haul Communications System Design Standards Applicable To The Defense Communications System 310A - Subsystem Design And Engineering Standards For Technical Control Facilities 311 - Technical Design Standards For Frequency Division Multiplexers 313 - Subsystem Design And Engineering Standards And Equipment Technical Design Standards For Long-Haul Communications Transversing Microwave Line-of-Sight (LOS) Radio And Tropospheric Scatter Radio 315 - Subsystem Design/Engineering & Equipment Technical Design Standards For Wire Systems 331 - Interoperability and Performance Standard for Video Teleconferencing 340 - Equipment Technical Design Standards for Voice Orderwire Multiplex 341 - Non-Diversity Digital Data 2400 bits per second 342 - Standards for Long Haul Communications Equipment Technical Design Standards for Voice Frequency Carrier Telegraph (FSK) 344 - Non-Diversity Digital Data 1200 bits per second 346 - Standards for Long Haul Communications-Equipment Technical Design Standards for Analog End Instruments and Central Office Ancillary Devices 347 - Equipment Technical Design Standards for Digital End Instruments and Ancillary Device