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lan based onstar and class 2?


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mauri197 
Copper - Posts: 80
Copper spacespace
Joined: October 24, 2006
Location: United States
Posted: November 07, 2006 at 10:44 PM / IP Logged  
what is the difference btween lan based onstar and class 2
outtaluck72 
Copper - Posts: 155
Copper spacespace
Joined: August 04, 2003
Location: United States
Posted: November 08, 2006 at 8:04 AM / IP Logged  

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.

1lowgalant 
Copper - Posts: 116
Copper spacespace
Joined: September 15, 2005
Location: United States
Posted: November 08, 2006 at 6:41 PM / IP Logged  
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.
Whatever you do, DO NOT let the white smoke leak out of the wires.....
sparkie 
Platinum - Posts: 2,061
Platinum spacespace
Joined: November 06, 2003
Location: Canada
Posted: November 08, 2006 at 6:51 PM / IP Logged  
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.
sparky
1lowgalant 
Copper - Posts: 116
Copper spacespace
Joined: September 15, 2005
Location: United States
Posted: November 08, 2006 at 8:09 PM / IP Logged  
very nice explaination, sparkie.
Whatever you do, DO NOT let the white smoke leak out of the wires.....
mauri197 
Copper - Posts: 80
Copper spacespace
Joined: October 24, 2006
Location: United States
Posted: November 10, 2006 at 9:39 AM / IP Logged  
tanx for the feedback

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