Clear-Com TEL-14 - Manual (Page 32)

T E L - 1 4 T W O - C H A N N E L T E L E P H O N E I N T E R F A C E 3 - 4
BLOCK DIAGRAM
Figure 3-4: Block Diagram of TEL-14 Telephone Interface
Ring
Detect
Line A
Seize,
Hold,
Disconnect
Contacts
CO
POTS
Line A
Line A
DSP
Audio
From
Intercom
Audio To
Intercom
Line A Microprocessor I/O
Microprocessor
Level
Detect
Intercom
Splash
Tone
Generator
Nulling Tone
Generator
Telephone Splash
Tone Generator
Send Level
Line A
Front
Panel
LEDs,
Switches,
Volume
Controls
Line A
Option
Switches
To Line A DSP / Tone
Generators & Detectors
Line B Microprocessor I/O
Line B
Front
Panel
LEDs,
Switches,
Volume
Controls
Hybrid
Line B
Seize,
Hold,
Disconnect
Ring
Detect
Contacts
CO
POTS
Line B
To Line B DSP / Tone
Generators &
Detectors
Line B
DSP Audio To
Intercom
Send Level
Telephone Splash
Tone Generator
Intercom
Splash
Tone
Generator
Nulling Tone
Generator
Audio
From
Intercom
Line B
Option
Switches
Test
Interface
Level & Call
Progress
Tone Detect
Level
Detect
Level & Call
Progress
Tone Detect
Hybrid
EEPROM
Telephone
Set
A Intercom
Control
Telephone
Set
B
Optical
Isolation