How to Generate QoS Events from Byte-TS Flow

This page describes the method to generate QoS events from the Byte-TS flow recorded over an ISDN/QSIG B channel. This is achieved by using the "Analog" properties in the Clarinet filter used on-line (filter name defined in the profile) or off-line (Filter-Run Protocol).

Connecting the unit and setting the test conditions

The connections of Clarinet-Book USB units and the test condition settings for basic monitoring are detailed in the following page:

Setting the test conditions for Byte-TS / Analog filter

The protocol filter file Isdn_xx_bts_analog_ref.acf  (Isdn_etsi_bts_analog_ref.acf or Isdn_att_bts_analog_ref.acf or Isdn_ni2_bts_analog_ref.acf) created with the Wizard from the Template list) specifies the stack of protocol with a reference file (default is or137.wav). The default reference file should be copied manually from  C:\Clarinet\Clatools\Template\I S D N\E T S I to the current directory.

As Byte-TS is defined in layer 1, the "analog" protocol is added in layer 2.

The"Analog Measurement" tab of the filter includes specifications for both functions: wav file generation and QoS measurement. The filter file Isdn_xx_bts_analog_ref.acf  is configured  to generate wav files and QoS events.

  • Modifications of the filter to apply in "Received Voice" part:
    • The codec specifications must correspond to the value used in the digital data flow (G711 mLaw, G711 ALaw, ...).
    • If disabled (no output file), only Qos measurement will be processed:
      • The file name (default= Bts_analog.wav)
      • The encoding specifications of the .wav file
    • If enabled the output file should specify:
      • The file name (default= Bts_analog.wav)
      • The encoding specifications of the .wav file
  • Modifications of the filter to apply in "Quality measurement" part:
    • The quality measurement should be set to "Continuous", "One Time"  or "Auto" 
    • The reference file name is optional 
    • The "Delay between measurement" defines the period of generation of  "Average" events.

Setting the test conditions for processing basic QoS events

The generation of basic QoS events provides:

  • The value of the Jitter
  • Periodically, average events for jitter

The generation of basic QoS events depends on the mode and reference file specifications:

Mode  Reference file Results in event file
Continuous No Jitter for Byte-TS events (2->N)
Continuous Yes Jitter for Byte-TS events : begin (ref file) ->N
One time No Jitter for Byte-TS events (2->N)
One Time Yes
  • Beginning +End of  meas (1st ref file)
  • Jitter for Byte-TS events : begin-end (1st ref file)
  • Average (1st ref file)

Setting the test conditions for processing PESQ QoS events

The generation of PESQ QoS events provides the PESQ value in Average events:

  • The value of the Jitter
  • Periodically, average events for jitter,  loss of packet and PESQ value.

When the PESQ resource is selected in Generator/Responder of  ISDN/SS7/QSIG profiles, the generation of PESQ QoS events requires the following specifications:

Mode  Reference file Synchro PESQ Results in event file
Auto Yes Yes Yes
  • Beginning +End of  meas (each ref file)
  • Jitter for Byte-TS events: begin-end (each ref file)
  • Average (each ref file)

Applying the filter conditions

Processing of the events can be acheived:

  • Off-line by using Filter èRun Protocol:
    • Source file including the Byte-TS events (Isdn_etsi_mon_e1.ace as an example).
    • Filter name (isdn_etsi_bts_analog_ref.acf  as an example)
    • Result file generated (Isdn_etsi_mon_e1_rlt.ace as an example).
  • On-line, at the end of the profile execution, with the following settings:
    • Configuration file set as WI_ANALOG by Clarinet-Init
    • Filter name defined in the profile to be execute
 
Related topics:
Generation of Analog events
Analog filter specifications
 

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