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Newsletter: GL Announces Enhanced Dual VF Tx/Rx Audio Application

Welcome to another December 2013 issue of GL's Newsletter providing information and insight into our enhanced Dual VF Tx/Rx audio application. 

Dual VF Tx/Rx (GUI)


Available directly from the DESKTOP - a special and separate Audio or Voice Frequency (VF) application called Dual VF Tx/Rx has been developed to interface directly with analog signals at various impedances, including high impedance for non-intrusive monitoring. This capability does not refer to or require any knowledge of timeslots. It permits greater visual and audible display of the VF signals e.g. one can see, hear, detect, and decode both the input and output signals - simultaneously. This application works for tProbe™ T1 and E1 and is part of the basic applications that are standard with any purchase of tProbe™. No special or optional applications are required. It can be launched from within the tProbe™ GUI or as a separate GUI from the desktop. The application is also enhanced to be compatible with Windows 7 (32-bit and 64-bit) OS.

Use of Dual VF Tx/Rx permits non-intrusive monitoring of traffic (Tones, Digits, and Voice) on analog lines (could be from digital to analog conversion from T1 E1 lines, but not necessarily). 

The application provides a simple integrated GUI to perform Analog Tx Rx Functions. VF monitor and record functions can be performed simultaneously using appropriate modes. The recording is independently and simultaneously made for both directions and can be later viewed together with Goldwave™. The files are recorded in mu-law format for tProbe™ T1 and in A-law for tProbe™ E1.  Only one direction can also be monitored and recorded on the relevant port. The tone threshold value for Tone detection can be set up to -80 dBm.  
The tProbe™ has digital Dual T1 E1 ports and Dual VF In Out ports. The VF Out ports can be configured to drop any timeslot from the incoming T1 E1 multiplexed signal. The VF In ports can be configured to insert the analog signal into an outgoing T1 E1 signal. This capability is readily available from the main GUI VF dialog bar.

Non-Intrusive VF Recording and Playback 

The Dual VF Tx/Rx supports spectral displays, which can be observed for both Tx/Rx directions. Analog signals can also be heard using the inbuilt speaker inside the tProbe™ unit or using stereo headphones if the environment is too noisy.

Analog interface configuration can be done with the help of a configuration pane, which is available with the default board configuration parameters. Board Type option allows Dual VF Tx/Rx to automatically connect to the T1 E1 devices when invoked, displaying the board in use.

Functional Operations

The sending and receiving traffic functions such as Tones, Digits, and Files are possible.

Transmit Tones option is used to send user-defined single/ dual frequency tones on VF ports (VF1/VF2). Tone 1 is the low frequency component and Tone 2 is the high frequency component. If a monotone is transmitted, Tone 2 is set to zero. Incoming tones on selected VF port can be detected by observing the power level status and the spectral display. 

Transmit Digits option is used to generate DTMF/MF digits on VF ports (VF1/VF2) with defined On/Off time (ms) and Power (dBm). Incoming DTMF, MF digits on selected VF port can be detected by observing the power level status and the spectral display. 

Send Voice File option is used to send GL proprietary voice files of type PCM on VF ports (VF1/VF2) and record voice files (*.pcm) on selected VF port. 

Modes of Operations

Single VF Port Mode - As depicted in the below screenshot, in VF Tx/Rx operational mode, Tx/Rx functions are supported on a single VF port (either VF1 or VF2).

VF Tone, Digits, Files Tx/Rx Actions 

Dual VF Ports Mode - As depicted in the below screenshot, in VF 1/VF 2 operational mode for each VF interface supports independent Tx/Rx between VF1 (Tx/Rx) and VF2 (Tx/Rx) simultaneously. The transmit actions on one VF port will be received on another VF port.

VF Tone, Digits, Files Tx/Rx Actions

VF Status and Spectral Display

The VF Tx/Rx Tones, Digits, and Files status can be observed using the VF Status and Spectral Display features graphically (spectral Power (dBm) Vs Frequency (Hz). 

VF Status and Spectral Display also provides
  • Frequency and Power values of the Tx/Rx signals
  • Indication of the type of Tx / Rx traffic handled on the ports
  • Options to enable or disable the speakers
  • Options to control the impedance of the Tx/Rx signals

VF Status and Spectral Display

Dual VF Tx/Rx application also works with the SS1 analysis and emulation applications from within the GUI. The SS1 Dialing Digits (Dialer) application provides the ability to dial and SS1 Analyzer to analyze tone sequences that make up SS1 dial digits. The SS1 Dialing Digits includes options to setup Dial Code with control mask & space frequencies and duration, and other parameters related to the digit dialer.

Summarizing Main Features

  • Supports two independent VF I/O
  • Internal speaker configured for Input side
  • TX and RX simultaneously
  • Full tone/digit generation/detection

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