What is the longest Stub Length?
Posted on June 10, 2009
Filed Under FAQ |
MIL-STD-1553B specifies that the longest stub length is 20 feet for transformer coupled stubs, but can be exceeded. With no stubs attached, the main bus looks like an infinite length transmission line with no disturbing reflections. When a stub is added, the bus is loaded and a mismatch occurs with resulting reflections. The degree of mismatch and signal distortion due to reflections are a function of the impedance presented by the stub and terminal input impedance. To minimize signal distortion, it is desirable that the stub maintain a high impedance. This impedance is reflected back to the main bus. At the same time, however, the impedance must be kept low so that adequate signal power will be delivered to the receiving end. Therefore, a tradeoff between these conflicting requirements is necessary to achieve the specified signal-to-noise ratio and system error rate performance (for more information, refer to MIL-HDBK-1553A).
Comments
Leave a Comment
If you would like to make a comment, please fill out the form below.
Recently
- Custom Military Cable Assemblies – Trusted Quality
- Why Buy Trompeter Products From MilesTek?
- What is the legacy of the MIL-STD-1553?
- What are the Physical Characteristics of MIL-STD-1553B?
- What are the Integral Hardware Pieces of a Typical Data Bus?
- Are Bus Couplers Necessary?
- What Type of Bus Couplers are Available?
- Why Does the Bus Need Termination?
- Should the Stub Ports be Terminated?
- What is the Characteristic Impedance of the Bus?