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rick merritt
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Other apporaches
rick merritt   9/2/2014 11:04:02 AM
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Yesterday Nokia Networks announced it is working with Bombardier to deploy a system for a part of the Spanish raliway:

"Nokia Networks is deploying an ERTMS* compliant GSM-R network that provides reliable voice communication between train drivers and the operation center. Additionally, the new radio network also enables faster deployment of ERTMS level 2 safety systems on high-speed train lines." (Emphasis mine)


Sounds like a different technoogy for a similar app. Anyone know?

 

Susan Rambo
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Important work
Susan Rambo   9/2/2014 6:40:12 PM
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Keep up the good work. This seems important as we get more high-speed rail systems or maybe even self-driving cars that my hook together in rail systems for long distance travel? WIth high speed rail coming into California soon, it will help to have these details worked out. (Though I assume high speed rail will be on its own separate track.)

Sanjib.A
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Interoperability is the key
Sanjib.A   9/2/2014 11:37:02 PM
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"...the bill requires the interoperability of PTC communications systems, so that a locomotive on any railroad can operate on any other railroad's track using the same control systems..."

Interoperability of such systems shall be mandated as there are systems from different manufacturers put together into the service, those shall be compatible to each other in order to safeguard lives. I do not understand why such key requirement is not mandated by the legislation.



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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