PLUGIN Handbook 2019

ERVAC MIL-STD-1553B Technical data he digital data bus was designed in the early 1970’s to replace analog point-to-point wire bun- dles between electronic instrumentation. The latest version of the serial local area network (LAN) for military avionics, currently known as MIL-STD-1553B, was issued in 1978. After 35+ years of familia- rity and reliable products, the data bus continues to be a popular militarized networking solution. Connector Types : There are several types of connectors used for such a bus and at the coupler stubs, the most common of which is the concentric twinax connector. These connectors typically have three bayonet coupling slots (plugs) or lugs (jacks) known as TRB type, which have the same envelope size as a coaxial BNC connector. The center contact is high (positive) connected to the twinax blue wire and the cylindrical contact is low (negative) connected to the twinax white wire. The outer body of the connector is the overall shielding. № Description Material ① Contact body Gold plated Brass ② Insulator Teflon ③ Contact pin 30 μ ″ Gold plated Beryllium Copper ④ Insulator Teflon ⑤ Insulator Teflon ⑥ Body Nickle plated Brass ⑦ Lock ring Nickle plated Brass DRAWING LIST Since the MIL-STD-1553B does not specify the type of connector to use in data bus abpplications, the connectors must be compatible with the cable required by the speci cation which are listed below. Cable Type Two-conductor twisted pair Capacitance 30 pF/ft. max Twist 4 per ft. min Characteristic Ω (Z0) 70 to 85 ohms @ 1 MHz Attenuation 1.5 dB/100 ft. @ 1 MHz max Shielding 75% coverage min. Stub Voltage 1.0V to 14.0 minimum signal voltage (transformer coupled) 1.4V to 20.0V minimum signal voltage (direct coupled) MIL-STD-1553B Data Bus Requirements Communications Line 53