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Dual VF Tx Rx - Analog
with tProbe™ Analyzer


The Dual VF Tx Rx (earlier called as Simplified Audio Client) application is designed exclusively to perform non-intrusive and intrusive VF audio monitoring, VF audio recording, and testing easily. Dual VF Tx Rx provides an alternate & simple GUI similar to the basic applications in T1 E1 Analyzer software to perform analog Tx/Rx functions. SS1 Analyzer and SS1 Dialer applications also have been enhanced to operate in conjunction with the Dual VF Tx Rx and its modules.

User's Guide
Quick Start Guide
Product Brochure

Now, Dual VF Tx Rx is available as a part of T1/E1 analyzer basic applications.

Dual VF Tx Rx supports Analog operational mode featuring two VF interfaces per unit, with each VF interface providing independent Tx/Rx functionality.

  • Mode 1: VF1 (Tx/Rx) and VF2 (Tx/Rx)
  • Mode 2: VF Tx and VF Rx

The application supports Spectral displays, which can be observed for both Tx/Rx directions. Analog signal can also be listened using the inbuilt speaker inside the tProbe™ unit or using stereo headphones if the environment is too noisy.

VF monitor and record functions can be performed simultaneously using appropriate modes. The recording is independently and simultaneously made for both directions. The files are recorded in mu-law format for both directions and can later be analyzed using Goldwave software. Only one direction can also be monitored and recorded on the relevant port.

Additional future enhancements of Dual VF Tx Rx include support for SS7 traffic, Ethernet traffic, digital interface support including BERT, noise measuring (gains/ hits/ dropouts), voice/noise capture to file & playback from file, Digits captured to file and other capabilities.

Main Features


  • Supports two independent VF I/O
  • TX and RX simultaneously
  • Full tone/digit generation/detection
  • Multiple cards supported per system - VF Tx/Rx and VF1 / VF2
  • SS1 & DTMF Goldwave Digit record/playback capability
  • SS1 emulator and analyzer capture/record/playback capabilities

Digital (coming soon..)

  • T1 BERT, Fractional Bert, Pulse mask, Jitter Measurement
  • DS0 noise (gains/hits/dropouts), Tone/Freq, Power measuring
  • Voice/noise/digits capture /playback support
  • T1 and DS0 Record/ Playback Goldwave capability
  • SS7 and Ethernet traffic and many more

Analog Interface Configuration

Configuration pane is available with the default board configuration parameters. Board Type option allows SAC to automatically connect to the T1/E1 devices when invoked, displaying the board in use. Audio traffic and files can be saved to the directory used for transmit and receive traffic. The tone threshold value for Tone detection can be set up to 80 dBm.

Analog Board Configuration

VF Tx / Rx Actions

In VF Tx /Rx operational mode, TX/Rx functions are supported on a single VF port (either VF1 or VF2). 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). Generate Tone 1 low frequency component listed from lowest to highest. If a monotone is transmitted, the tone frequency is set here. Tone 2 a high frequency component. If a monotone is transmitted, Tone 2 is set to zero. Detect Tones on selected VF port viewing the status and the spectral display.

Transmit Digits option used to generate DTMF/MF digits on VF ports (VF1/VF2) with defined On/Off time (ms) and Power (dBm). Support to Detect DTMF, MF digits on selected VF port.

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.

VF Tone, Digits, Files Tx/Rx Actions

VF1 and VF2 (Tx / Rx) Actions

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

The VF Tx/Rx Tones, Digits, and Files status and the spectral can be viewed for sending VF ports in the VF Status and Spectral Display.

VF 1 and VF 2 Transmit and Receive Actions

VF Status and Spectral Display

The Side panels display

  • Tx/ Rx status for the tone, digits, voice transmitted/received on any particular VF port.
  • Frequency, Power count status of the VF In and Out
  • Data transmitted or received on a specified VF port graphically (spectral Power (dBm) Vs Frequency (Hz))
  • Sending/Receiving Speakers for Tx/Rx ports
  • Multiple impedance options for audio In and Out ports

VF Status and Spectral Display

SS1 Emulator and Analyzer

SAC is enhanced to invoke SS1 analysis and emulation applications from within the GUI. The SS1 Dialing Digits (Dialer) and SS1 Analyzer applications provides the ability to dial and analyze tone sequences that make up SS1 dial digits. The SS1 Emulator includes options to setup Dial Code with control mask & space frequencies and duration, and other parameters related to the digit dialer. Users can create channel for Transmission (Tx), choosing Port and Timeslot.

Using SS1 Analyzer sequences of pulse and guard tones are detected, decoded, and assembled into their corresponding dial digits. The tone sequences are also verified for compliance against a “specification” parameter file which can correspond to published standards or user criteria. Refer to SS1 Signaling Emulator and SS1 Analyzer webpage for details.

SS1 Analyzer

SS1 Simulation (Dialer)

Goldwave Capabilities

Dual VF Tx Rx includes Goldwave capabilities to view and analyze send and receive audio files. Any chosen mono and stereo (east and west) files in supporting file formats (*.pcm, A-Law, Mu-Law, *.wav, and others) that have been recorded can be viewed, heard, and analyzed using Goldwave.

Refer to Goldwave webpage doe comprehensive details on record or playback capabilities using Goldwave application.

Goldwave Support

Coming Soon…


  • Standalone without a PC interface to T1 line
  • Access remotely via Ethernet interface - bridging TDM to Ethernet (IP)
    • TDM over IP and IP over TDM testing
    • TDM to Ethernet convergence testing


  • Measure and Record net loss at 1004 Hz using C-Notch and C-Type filtering
  • Peak to Average Ratio (P/AR)
  • Phase Jitter
  • SNR
  • Slope Measurement using 3-tone slope

Buyer's Guide:

Please Note: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units), UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.

Item No. Item Description
XX605 Dual VF Tx Rx
(earlier called as Simplified Audio Client) Software (Included with Basic Software)
(optional xx626)
XX626 SS1 Dialer and Signaling Analyzer (Optional)
  Related Software
XX022 DTMF/MF Detector & Generator Software
SA048 Goldwave Software
XX050 Signaling Bits Recorder Software
XX020 Record/Playback File Software
XX031 Enhanced T1 / E1 Call Capture/Analysis Software
XX012 Pulse Mask Compliance, Jitter Generation, and Jitter Measurement
  Related Hardware
PTE001 tProbe™ Dual T1 E1 Laptop Analyzer with Basic Analyzer Software
HTE001 Universal T1/E1 Card with Basic Analyzer Software
UTE001 Portable USB based Dual T1 or E1 Laptop Analyzer with Basic Analyzer Software

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