IEEE 1390-1995

This standard describes a utility telemetry service (UTS) architecture operated over the switched telephone network. The UTS architecture described is a basic transport architecture capable of supporting many different applications. Telemetry calls may be initiated from either the utility/enhanced service provider (ESP) or the telemetry interface unit (TIU) on the end userA?s premise. The two access methods defined for this service are _Central office service unit (COSU) access method and _Direct dial access method The two TIU transmission methods defined for this service are _Off-hook transmission method and _On-hook transmission method. The architecture covered in this standard is described in terms of a basic utility meter reading/controlling service. However, any number of other applications can be delivered using the telemetry transport service. These other applications are not covered in this standard.