ALERT

[FREE DEMO] Deploy Your Enterprise Cloud in Minutes

Data Access Arrangement (DAA)

Definition - What does Data Access Arrangement (DAA) mean?

Data access arrangement (DAA) is a computer modem with a built-in electronic system that interfaces with public switched telephone networks (PSTN). DAA is required for PSTN devices, including set-top boxes, fax machines, private branch exchanges (PBX) and alarm systems.

DAA devices are isolated from high voltage phone lines, but system authorities require device registration. Preregistered DAA is built into most modems and devices.

DAA is also known as a telephone line interface circuit.

Techopedia explains Data Access Arrangement (DAA)

There are three international DAA standards:

  • North America: Federal Communications Commission (FCC) Part 68, which parallels many Canadian and Mexican regulations
  • Europe: European Telecommunications Standards Institute (ETSI) Common Technical Regulation (CTR) 21
  • Japan: Japan Approvals Institute for Telecommunications Equipment (JATE)

A key DAA design factor is layout, which defines the area between line and modem components. Examples include:

  • Optocoupler: Computer and phone line are connected without surge risk or damage
  • Clare Based: Uses two high-voltage isolation capacitors to implement caller ID and ring detection with separate PSTN/pathways
  • Capacitive-Coupled: Uses integral modem system components to directly interface with the digital signal processor (DSP)
  • Simple: Includes incoming ring detector and hook switch relays and provides other application-specific functions

Techopedia Deals

Connect with us

Techopedia on Linkedin
Techopedia on Linkedin
Tweat cdn.techopedia.com
"Techopedia" on Twitter


'@Techopedia'
Sign up for Techopedia's Free Newsletter!

Email Newsletter

Join thousands of others with our weekly newsletter

Resources
The 4th Era of IT Infrastructure: Superconverged Systems
The 4th Era of IT Infrastructure: Superconverged Systems:
Learn the benefits and limitations of the 3 generations of IT infrastructure – siloed, converged and hyperconverged – and discover how the 4th...
Approaches and Benefits of Network Virtualization
Approaches and Benefits of Network Virtualization:
Businesses today aspire to achieve a software-defined datacenter (SDDC) to enhance business agility and reduce operational complexity. However, the...
Free E-Book: Public Cloud Guide
Free E-Book: Public Cloud Guide:
This white paper is for leaders of Operations, Engineering, or Infrastructure teams who are creating or executing an IT roadmap.
Free Tool: Virtual Health Monitor
Free Tool: Virtual Health Monitor:
Virtual Health Monitor is a free virtualization monitoring and reporting tool for VMware, Hyper-V, RHEV, and XenServer environments.
Free 30 Day Trial – Turbonomic
Free 30 Day Trial – Turbonomic:
Turbonomic delivers an autonomic platform where virtual and cloud environments self-manage in real-time to assure application performance.