AT&T 4A - User Manual

  
 
 
   

 

    
 
 


      
    
    
   
  
    
     

   
     
      


    
   

        

 


   
   


   

   

  
   
     
   

      
       

      
      
     
 
  
  

  
   
 

      
      
  
      

       

       
 
 
 
  
     
    

     

       
     
   
      

   

 
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Summary

1. IDENTIFICATION

1.01 4 A Speakerphone System Definition

Defines the 4A speakerphone system as a hands-free, voice-switched telephone adjunct.

1.02 4 A Speakerphone System Components

Lists the primary components: transmitter, loudspeaker set, power unit, and connector/adapter.

1.05 Speakerphone Component Ordering

1.08 4 A Speakerphone Circuitry Features

Explains the voice-switching circuit, gain control, and anti-singing measures.

1.09 680 A Transmitter Description

1.10 108 A Loudspeaker Set Description

1.11 82 A Connecting Block Function

Explains the function of the 82A connecting block for system interconnection.

1.12 223 A Adapter Function

1.13 85 B1 Power Unit Function

Explains the power unit's role in transforming AC power for the system.

2. INSTALLATION

2.01 Telephone Set Requirements

Lists requirements for telephone sets used with the 4A speakerphone system.

2.02 Planning an Installation

Provides guidelines for planning the installation, including placement and environmental considerations.

4. MAINTENANCE

4.01 Tests and Adjustments

Describes tests to perform after installation or maintenance.

AT&T 4A Specifications

General

Manufacturer	AT&T
Brand	AT&T
Model	4A
Connectivity	Wired
Caller ID	Yes
Call Waiting	Yes
Speakerphone	Yes
Power Source	AC Power