3- 4
TEL-14 TWO-CHANNEL TELEPHONE INTERFACE
Telephone Splash
Tone Generator
Nulling Tone
Generator
Send Level
Hybrid
Intercom
Splash
Tone
Generator
Ring
Detect
To Line A DSP / Tone
Generators & Detectors
Level
Detect
Level & Call
Progress
Tone Detect
Line A
DSP
Audio
From
Intercom
BLOCK DIAGRAM
Audio To
Intercom
Contacts
Telephone
Set
CO
POTS
Line A
Line A
Option
Switches
Line A
Front
Panel
LEDs,
Switches,
Volume
Controls
A Intercom
Line B
Option
Switches
CO
POTS
Line B
B Control
Line B
Front
Panel
LEDs,
Switches,
Volume
Controls
Telephone
Set
Contacts
Audio
From
Intercom
Figure 3-4: Block Diagram of TEL-14 Telephone
Interface
Audio To
Intercom
Ring
Detect
Line B
Microprocessor I/O
To Line B DSP / Tone
Generators &
Detectors
Line B
Seize,
Hold,
Disconnect
Hybrid
Intercom
Splash
Tone
Generator
Level
Detect
Send Level
Telephone Splash
Tone Generator
Nulling Tone
Generator
Level & Call
Progress
Tone Detect
Line B
DSP
EEPROM
Microprocessor
Optical
Isolation
Line A
Microprocessor I/O
Line A
Seize,
Hold,
Disconnect
Test
Interface
Summary of Contents for ECLIPSE TEL-14
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