Atmel AVR2070 User Manual

 

8240B-AVR-06/09 

Route Under Mac (RUM) is a small 802.15.4 protocol developed by Atmel. This 
protocol routes packets at the MAC layer, as opposed to the application or IPv6 layer, 
which would be a route over scheme.  The under comes from the fact that routing is 
done at a low level. This has a number of advantages: 

•  Routers and end nodes can be simpler, and therefore less expensive.  These 

nodes manage almost no routing information. 

•  The coordinator knows all pertinent information about every node in its PAN, 

which means special “guessing” routing algorithms are not needed. 

•  Higher level code does not have to be concerned with routing, and has only 

to send a packet to a destination address. 

The main components of the stack include RUM, and IPv6 / 6LoWPAN. The complete 
stack features the following highlights: 

•  Small object size.  A minimal build, with only RUM and a tiny example 

application, is about 6KB for an AVR end node. 

•  Self-forming network. Nodes power up, find a network, and associate to it. 
•  Self-healing network.  Nodes re-associate upon a failure to communicate. 
•  Multi-hop routing. Nodes can be multiple hops away from the coordinator. 
•  Source Code Included. Free for use and free to modify if used with Atmel 

hardware. 

•  Designed to be a base platform for customer applications. 
•  Very configurable, with the ability to add or remove features at compile time.  

Features include 6LoWPAN frames, end node sleeping, and a terminal mode. 

•  Portable to almost any Atmel processor.