U-SNAP: There have been a variety of incompatible standards
for HAN. This lack of standardization in HAN Utility has driven major AMI suppliers and product manufacturers
to develop a solution, namely Utility Smart Network Access
Port (U-SNAP). The main requirement is the existence
of an interface to connect any type of product to a
HAN. U-SNAP basically enables the standardization of a
connector and serial interface and identifies the hardware
interface, physical dimensions, data transfer, message contents
and protocol specifics for HAN devices to provide
many communication protocols to connect HAN devices
to smart meters