Universal Personal Telecommunication (UPT) - Access Devices Dual Tone Multi Frequency (DTMF) Sender for Acoustical Coupling to the Microphone of a Handset Telephone
The mechanical and acoustical characteristics of a UPT DTMF access device which is acoustically coupled to the microphone of a handset telephony terminal.
Equipment Engineering - Environmental Conditions and Environmental Tests for Telecommunications Equipment; Part 1-2: Classification of Environmental Conditions Transportation
Transmission and Multiplexing (TM)- High Bitrate Digital Subscriber Line (HDSL) Transmission System on Metallic Local Lines HDSL Core Specification and Applications for 2048 KBIT/S Based Access Digital SE
