lan based onstar and class 2?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=85316
Printed Date: April 28, 2024 at 6:45 AM
Topic: lan based onstar and class 2?
Posted By: mauri197
Subject: lan based onstar and class 2?
Date Posted: November 07, 2006 at 10:44 PM
what is the difference btween lan based onstar and class 2
Replies:
Posted By: outtaluck72
Date Posted: November 08, 2006 at 8:04 AM
Onstar is just a function of the car. the question would be what's the difference between LAN and Class II? LAN is just a different way the car communicates with its components. Class II is slower then LAN. It's also another way the car manufacturers try to make installing aftermarket components (Aftermarket radios, alarm systems, ect...) more a pain in the butt for the installer. I don't think they intentionally did this but you never know.
Posted By: 1lowgalant
Date Posted: November 08, 2006 at 6:41 PM
the whole point for all the new data systems is to save space and make in vehicle component communications faster. as for the saving space, a couple of wires are now doing the work that it used to take 10 or 15 wires to do which saves wiring and weight. LAN is indeed a faster and more reliable system than the class II data system, kinda like chryslers CANBUS system. onstar has nothing to do with these systems in general.
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Whatever you do, DO NOT let the white smoke leak out of the wires.....
Posted By: sparkie
Date Posted: November 08, 2006 at 6:51 PM
GMLAN and Class II are just two types of data bus circuits in GM vehicles. Vehicles prior to 2006 all used Class II data to allow the Onstar module to communicate to other modules in the vehicle. Some 2006 and newer vehicles have Onstar modules that communicate on the GMLAN system. The GMLAN system has two parts to it. A low speed LAN circuit and a high speed LAN circuit. The low speed is designed for devices that don't have a high priority or need for real time communication, like audio systems, Onstar, windows, etc. The high speed bus is designed for engine mangement which requires a very high speed data rate. The Class II data bus can't deliver this real time data need as it is much slower and can't carry as much data. The same thing is happening in other types of communication. This is similar to systems now using fibre optics to allow a higher data transfer rate.
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sparky
Posted By: 1lowgalant
Date Posted: November 08, 2006 at 8:09 PM
very nice explaination, sparkie.
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Whatever you do, DO NOT let the white smoke leak out of the wires.....
Posted By: mauri197
Date Posted: November 10, 2006 at 9:39 AM
tanx for the feedback
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