SA545 Sames, SA545 Datasheet - Page 14

• Manufacturer Part Number: SA545
• Description: PULSE/DTMF SWITCHABLE DIALLERS WITH 10 REPERTORY MEMORIES
• Manufacturer: Sames

11. Loop Disconnect Dialling (Figures 5 and 6)
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SA545
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'.
t
t
t
t
t
1
2
3
4
5
= Pre-digit Pause (= t
= Break Period (60ms or 67ms)
= Make Period (40ms or 33ms)
= Post-digit Make (= t
= Inter-digit Pause (800ms or 500ms)
sames
Figure 6: Detailed Timing for IMP Output
5
3
)
)
Figure 5: LD Mode Timing Diagram