TDD Refresher - Technologies Used by Persons who are Deaf or Hard of Hearing

TDD Refresher

Course Goal

To familiarize the student with technologies used by persons who are deaf or hard of hearing.


Telecommunicators must be able to effectively process 9-1-1 calls from individuals who are deaf or hard of hearing. There are many technologies used by persons who are deaf, which may require the Telecommunicator to use special skills to process the call.


Course Documentation

  • Online Course Acknowledgement
  • Expectations for Online Students
  • Learning Objectives
  • Course Operation

TDD Refresher - Introduction


  • Introduction
  • Most of Us Take Calling 911 for Granted. That Needs to Change
  • Knowledge Checkpoint

TDD Refresher - Hearing Aids


  • Hearing Aids.pdf
  • How Hearing Aids Work
  • Knowledge Checkpoint

TDD Refresher - Cochlear Implants


  • Cochlear Implants
  • How A Cochlear Implant Works by Advanced Bionics
  • Knowledge Checkpoint

TDD Refresher - Implanted Devices


  • Implanted Devices
  • How the Cochlear™ Baha® Connect System Works
  • Knowledge Checkpoint

TDD Refresher - Assisted Listening Devices


  • Assistive Listening Devices.pdf
  • Hearing Assistive Technology at the Movies
  • Knowledge Checkpoint

TDD Refresher - Phones


  • Phones.pdf
  • Amplified Phone With Answering Machine
  • CapTel Captioned Telephone
  • Knowledge Checkpoint

TDD - Closed Captions


  • Closed Captions.pdf
  • What Are The Legal Mandates Related To Closed Captioning
  • Knowledge Checkpoint

TDD Refresher - Alarms


  • Alarms
  • Get Alarmed Kansas offers free smoke alarms for deaf and hard-of-hearing residents
  • Knowledge Checkpoint

TDD Refresher - Conclusion


  • Conclusion.pdf
  • Duracell_ Trust Your Power - NFL's Derrick Coleman, Seattle Seahawks
  • Knowledge Checkpoint

Course Exam

  • Final Exam

Course Evaluation

  • Course Evaluation - Required

About Your Instructor

Tina L.  Chaffin

Tina L. Chaffin

9-1-1 Training Specialist

I have over 22 years of experience as a 9-1-1 Telecommunicator/Trainer. I have experience in PSAPs large and small. I currently work part-time in a PSAP to retain my skills and industry knowledge.

I am passionate about training and public education. 

I currently hold the following certifications NENA ENP, APCO RPL, Texas Commission on Law Enforcement Master Telecommunicator and Advanced Instructor, Texas Department of Public Safety TCIC/TLETS Instructor, and National Center for Missing and Exploited Children Instructor.

Learning Objectives

Discuss requirements of processing calls from a person who is deaf or hard of hearing.

Differentiate between different kinds of hearing aids.

Explain implants available to assist with hearing.

Explain types of phones used by persons who are deaf or hard of hearing.

Discuss closed captioning requirments for TV programs.

Identify different alarms used by persons who are deaf or hard of hearing.