Published
The present document specifies the data link message and parameter codings for the PSTN subscriber line protocol to support display and related services sent by the Local Exchange (LE). The data transmission in the subscriber line protocol is accomplished by using asynchronous voice-band Frequency-Shift Keying (FSK) signalling.
PUBLISHED
SSH EN 300 659-3 V1.3.1:2001
60.60
Standard published
Jun 29, 2023