DS/ETS 300659-1
Public Switched Telephone Network (PSTN) - Subscriber line protocol over the local loop for display (and related) services - Part 1: On hook data transmission
| Organization: | DS |
| Publication Date: | 10 June 1997 |
| Status: | inactive |
| ICS Code (Telephone networks): | 33.040.35 |
scope:
This first part of ETS 300 659 specifies the subscriber line protocol for the support of PSTN display services at Local Exchange (LE) in "on hook" state. The subscriber line protocol is accomplished by using asynchronous voice-band Frequency-Shift Keying (FSK) signalling. In addition, annex C is provided in order to allow the continuation of use in those networks that already implemented a Dual Tone Multi-Frequency (DTMF) based subscriber line protocol.
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