13.4.1 Circuit operation
TOP PREVIOUS NEXT
● On hook
Q101 is open, Q101 is connected as to cut DC loop current and cut the voice signal.
● Off hook
Q101 turns on thus providing an off-hook condition (active DC current flow through the circuit)
and the following signal flow id for the DC loop current. T → POS101 → D101 → Q101 → Q108
→ R124 → D106 → D101 → R
● The receiving signal flows:
TEL line → POS101 → Q101 → C113 → R125 → C108 → Q109 → Q405 → Q406 → Speaker
● The transmission signal flows
Mic → Q421 → Q424 → C435 → R437 → Q108 → Pos101 → Tel Line
http://202.224.189.179/view_new/OT/KX-TS2365RUB/SVC/s1304010000.html (1 of 2)11.02.2008 12:57:38
To Next Page
Loading...
