Train Access Point Signal Attenuation for MU Cable Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Communication networks in train consists face signal degradation issues due to the lack of shielding and twisting in MU cables, leading to weak signal strength at distant locomotives, which can be exacerbated by increasing transmit signal strength, potentially overloading components closer to the source.
Innovation Solution
The implementation of an access point with a communications processor, attenuators, and voltage clamps to selectively attenuate and amplify signals, ensuring reliable communication across the network by managing signal strength and preventing component overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmit signal strength is increased to overcome signal degradation in distant locomotives, then the signal strength at distant locomotives is improved, but the components of locomotive computer systems close to the origin of the signal are overloaded
Solution Approach 1:
The patent implements different attenuation levels at different locations along the MU cable. Access points closer to the signal origin apply higher attenuation (e.g., 10 dB) while those farther away apply lower attenuation (e.g., 3 dB). This localized differentiation of signal treatment ensures that each locomotive receives an appropriate signal strength tailored to its position in the consist, preventing component overload at near locations while maintaining adequate signal strength at distant locations.
2Device complexity
If MU cables are used for network data communication, then an existing infrastructure is utilized, but signal degradation occurs due to lack of shielding and twisting
Solution Approach 1:
The patent implements attenuation functionality at each access point before signals are transmitted through the MU cable network. By proactively reducing signal strength at the source and at intermediate points, the system compensates for the inherent signal degradation characteristics of unshielded/untwisted MU cables. This preliminary action prevents signal overload at near locations while ensuring sufficient signal strength reaches distant locomotives, thereby enabling reliable communication over the existing infrastructure.
Data Source
AI summary
An access point for a communication network is disclosed. The access point may have a communications processor configured to receive signals from a different access point of the communication network, and at least a first attenuator configured to selectively attenuate the signals before they are received by the communications processor. The access point may also have a voltage clamp configured to limit a strength of the signals before they are received by the at least a first attenuator, and a second attenuator configured to attenuate all signals before they are received by the voltage clamp.