Statements (15)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:International_Standard
|
| gptkbp:appliesTo |
gptkb:public_switched_telephone_network
|
| gptkbp:defines |
frequencies for signaling
|
| gptkbp:firstPublished |
1960s
|
| gptkbp:focusesOn |
multi-frequency signaling
|
| https://www.w3.org/2000/01/rdf-schema#label |
ITU-T Recommendation Q.23
|
| gptkbp:issuedBy |
gptkb:ITU-T
|
| gptkbp:partOf |
gptkb:ITU-T_Q_Series
|
| gptkbp:relatedTo |
Q.24
Q.25 |
| gptkbp:status |
in use
|
| gptkbp:usedFor |
telephone exchange signaling
|
| gptkbp:bfsParent |
gptkb:Touch-tone_telephone
gptkb:DTMF |
| gptkbp:bfsLayer |
6
|