Overview |
Application Diagrams |
Description
UTA specifications |
UTA Connections |
Buyer's Guide
Overview
The Universal Telephony Adapter (UTA) is a hardware adapter that interfaces a PC sound device to telephony equipment to
provide a means of testing voice quality transmissions across the network. Used in conjunction with GL's VQuad™ software
application, the UTA can be directed to automatically send and record sample voice files between nodes of a
telephony network. These files can then be submitted to GL's Voice Quality Testing (VQT) software application for analysis
according to widely accepted International Telecommunications Union (ITU) voice comparison algorithms.
The UTA is also capable of measuring Round Trip Delay (RTD) between nodes of the voice network. This is accomplished by
utilizing an on-board pulse generator to transmit a fixed-frequency across the network. This pulsegen function is invoked through
VQuad™ software commands to the UTA microcontroller. For more information on RTD measurement, please
visit Network Delay Measurement webpage.
The UTA features all the circuitry necessary to universally adapt to any telephony instrumentation, including standard Plain Old
Telephone Systems (POTS), digital hybrid interfaces, Voice over Internet Protocol (VoIP) networks, wireless cellular phones and
mobile radios.
The UTA features an integral USB microcontroller that directs all software-controlled functions including: Audio IN Select (delay or
audio measurement), RTD signal generation (pulsegen), and Push-To-Talk (PTT) control.
Application Diagrams
- Automated Wireless, Landline, and VoIP Path Analysis with VQT
These configurations interface at the analog level (analog into the speaker and mic inputs of a mobile phone, analog inputs
of a landline phone, and analog inputs of a VoIP phone). These systems can also perform roundtrip delay measurements.
- Network Delay Measurement
The Universal Telephony Adapter (UTA) features a built in Round Trip Delay (RTD) measurement capability. Two UTAs can
automatically determine the RTD, regardless of what network they may be analyzing. A one-way MANUAL delay measurement is
also achievable using the UTAs and Adobe Audition. For more information on RTD measurement, please visit
Network Delay Measurement webpage.
Description
Theory of Operation
The UTA is an in-line adapter that allows a PC-based sound device to interface with all types
of telephony equipment. This is accomplished by tapping into the audio signals coming from the telephony equipment and feeding
them through the UTA circuitry and into the PC-based sound device. A simplified block diagram depicting the audio signal flow of
the UTA is shown in the below image.
This configuration allows the PC to send sound waveforms from the audio device to the network interface and then across the
network.
UTA specifications
Physical Dimensions:
Height: 1.52 in. (38.6mm)
Width: 4.17 in. (106.0mm)
Depth: 3.00 in. (76.2mm)
Weight: 0.613 lb. (0.178 kg) |
Power requirements:
Input Voltage: +5VDC (derived from USB bus)
Current load: 175mA (typical) |
External Connections:
USB 2.0: Type B USB Jack
Audio Input/Output Jacks:
Input/Output Impedance xxx ohms
Input/Output Level (V)
Landline In/Out Jacks:
Input/Output Impedance xxx ohms
Input/Output Level (V)
Mobile Phone Jack:
Input/Output Impedance xxx ohms
Input/Output Level (V) |
| Connector Specifications |
| Number of connections |
4 |
| power rating |
16VDC@300mA |
| contact resistance |
100mO MAX |
| insulation resistance |
100mO or greater at 500VDC |
| voltage withstand |
500V AC RMS, 1 minute |
| flammability |
UL94V-0 rated |
| life |
5,000 cycles |
UTA Connections
- Push-to-Talk LED
When illuminated indicates that the PTT function is active. Te active state indicates that
the radio has been placed in transmit mode. Conversely, the inactive state (LED off) indicates the radio is in receive mode. For
pin-out information on wiring the radio to the UTA refer to the description of the PTT connector (Item #15).
- Trigger LED
When illuminated indicates that an RTD pulse has been detected. This LED may also illuminate
momentarily when connecting or disconnecting audio lines.
- Monitor Jack
This 3.5 mm jack (stereo miniature phone type) provides for connection of a headset or
amplified speakers to monitor the Audio In/Out signal.
- Power LED
When illuminated indicates the UTA is receiving power and is ready to operate. The UTA is
powered from the USB bus.
- Mobile Jack
The "Audio In/Audio Out" port for connecting cellular phones or mobile radios to the UTA.
- Handset Jack
For use with handset-type phones. Connect the curly cord of the handset to this jack.
- Talk/Line | Mobile/Landline Switch
This switch has two functions depending on the type of telephony
equipment connected to the UTA.
If a handset-type phone is connected, the switch selects either Talk or Line mode. Line
mode allows audio from the Edirol UA-20 sound device to pass through UTA. Talk mode is a feature that allows users to speak
directly to each other through the handset microphone. When in Talk mode, the audio signal from the Edirol UA-20 is interrupted.
The handset earphone is always enabled when the handset is connected to the UTA.
If the telephony equipment
(cellular, radio, or landline phones) is connected to either the mobile or landline jacks this switch must be in the UP position. This
enables the audio path within the UTA for these types of phones. The down position disables the audio path from these types of
phones.
- Landline Out Jack
Audio Out port that connects to the Audio In of landline adapter-type phones that
provide line level Audio In/Out ports.
- Landline In Jack
Audio In port that connects to the Audio Out of landline adapter-type phones that
provide line level Audio In/Out ports.
- Audio Out Jack
Audio Out port that connects to the Audio In port of the Edirol UA-20 Audio Capture
device.
- Audio In Jack
Audio In port that connects to the Audio Out port of the Edirol UA-20 Audio Capture
device.
- USB Jack
Communications and power interface connection. Connect to the computer USB port directly
or through a USB hub.
- Phone Jack
For use with handset-type phones. Connect to the telephone base modular jack from
which the handset curly cord was removed.
- 3-Wire/ 4-Wire Handset Microphone-type Switch
For use with handset-type phones. For most phone
handset types, the normal position is DOWN (4-wire). Switch to the UP (3-wire) position when using with 3-wire type handsets.
- PTT Terminal Block
For use with radios that require activation of a push-to-talk function to transmit or
receive audio signals. This terminal block is connected to the software-controlled relay internal to the UTA and provides a dry
contact closure. When PTT is active (PTT LED on), pins 2 & 3 are shorted. When PTT is inactive (PTT LED off), pins 1 & 2 are
shorted.
Pin 1 - Normally Closed
Pin 2 - Common
Pin 3 - Normally Open
Buyer's Guide:
* Specifications are subject to change without notice.
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