ESMR
ESMR (Enhanced Specialized Mobile Radio) : An enhancement to SMR technology, allowing two-way radio service with the capability to provide wireless voice telephone service to compete against cellular. It uses TDMA technology to put six voice conversations into one 25KHz UHF radio channel in the 806-821MHz band. ESMR can be deployed on a cellular basis, and supports hand-off, like cellular radios. ESMR was developed by Nextel and Geotek. ESMR will support low-speed data, as well as voice.
