SA54L14 Ver la hoja de datos (PDF) - South African Micro Electronic Systems

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SA54L14

PULSE/DTMF SWITCHABLE DIALLERS

South African Micro Electronic Systems 

SA541

DTMF Mode Timing Diagram

Figure 4: DTMF Mode Timing Diagram

10. Loop Disconnect Dialling (Figures 5 and 6)

The MASK output is provided in order to disable the speech circuit during LD dialling.

Consequently, the MASK output is normally at logic '1' in the off-hook condition, but

changes to logic '0' during LD dialling. MASK also changes to logic '0' in order to

signal a Timed Break Recall (Flash) to the line. Both MUTE and MF OUT remain

low during LD dialling.

LD dialling is signalled on the IMP output. A break is signalled by a logic '0', make

periods and IDP times are signalled by a logic '1'. When not dialling, the IMP output

remains at logic '0'.

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