GL Communications Inc.
 
 
 
Home  >  Analysis  >  Software Applications  >  Protocol Analysis

Real-time & Remote SS1 Emulator and Analyzer



Overview

Selective Signaling "SS-1" is a 2 and/or 3 digit dial system used by the Federal Aviation Administration "FAA" within their National Airspace System "NAS" Ground-to-Ground Air Traffic Control Network. It is used on leased and FAA lines between the Air Route Traffic Control Center's "ARTCC", Terminal Radar Approach Control "TRACON", Air Traffic Control Tower's "ATCT", Lockheed Martin Flight Service Hub's "FS-21", Military, National Weather Service and nongovernmental aviation facilities for the control and management of aircraft flights.

 
 
pdf
User's Guide
 
pdf
Product Brochure
 
View Presentation

The GL's SS1 Analyzer detects and analyzes tone sequences that make up SS1 dial digits. 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.

The SS1 Emulator (Dialer) application provides the ability to setup and dial tone sequences that make up SS1 dial digits. The applications' interface includes options to setup Dial Code, and control Mask (pulse) & Space (guard) frequencies and duration, Initial, Nominal, and Final Durations, Timeout definitions, Transmit Channel, and other similar parameters related to the dial code.


Main Features:

  • Real-time and File-based) analysis
  • Generate and introduce SS1 Dial Codes on Transmit Channels using SS1 Dialer
  • Control mark & space frequencies and duration, and power during transmission of SS1 Tones
  • Dual monitoring capability allowing multiple instances of SS1 analyzer to simultaneously tap E and W direction traffic.
  • Ability to capture either TDM or audio signals
  • Configuration screens to conveniently specify the criteria used to evaluate the sequence of SS1 tones, including specifying the use of 2-digit or 3-digit dial codes. See the figure below.
  • Display of received dial codes, including the characteristics of the underlying tones. Dial codes whose underlying tone sequences do not meet stated criteria are clearly identified with the erroneous tone characteristics highlighted
  • Provides controls to save sets of evaluation criteria, to reinstate previously saved criteria, and to reinstate factory default (industry standard) settings
  • Save results to files in a form that is widely understood by popular desktop data management and analysis tools such as Microsoft® Access and Microsoft® Excel
  • Allows easy reviewing any number of selected dial code sequences and their underlying tone sequences while ongoing capture and analysis is proceeding
  • Operate the SS1 Analyzer either remotely from the data acquisition site, or as on the same PC that is capturing the data
  • Examine a faulty dial code at length with Review Dial Code and Spectral Graph features, even as a run is in progress.

Specifying SS1 Evaluation Parameters

The SS1 Analyzer implements a wider range of values, which place lower and upper bounds on the FAIL range. Measurements falling outside this range disqualify a signal from being an SS1 Signaling Tone.

The values are organized as follows:

  • Standard: The standard value of the parameter.
  • Low Accept through High Accept: Measurements within this range are judged to PASS the evaluation criteria.
  • Low Reject through High Reject: Measurements within this range but outside the Low Accept to High Accept range are judged to be MARGINAL.

Figure: SS1 Parameters

Parameter Scoring Options

  • Pass/Marginal/Fail option - evaluates tones and their associated digits and dial codes records as PASS, MARGINAL, or FAIL.
  • Pass/Fail: Marginal=Pass option causes all MARGINAL scores to be reported as PASSes.
  • Pass/Fail: Marginal=Fail option causes all MARGINAL scores to be reported as FAILures.

Real-time Analysis

Using GL's T1 Cards, one can internally capture signal data on a TDM channel or "timeslot". However, GL's T1 Cards also provide VF Input and Output jacks through which you can insert an audio signal onto a designated T1 timeslot. If the SS1 signals are being carried on an audio line, route that line into the VF Input associated with the T1 port, and then perform analysis.

For Offline analysis, SS1 analyzer allows users to specify the folder containing the files for SS1 analysis. File formats supported are a-law, u-law pcm files.

The left pane (Tree View) shows the SS1 Dial Codes detected during a monitoring run displayed in protocol tree form. Each Dial Code can be "expanded" to show the Digits at the next lower level of the protocol. The Digits can in turn be expanded to show the sequence of Tones making up the digit at the bottom level of the hierarchy. The right pane (Tone View) shows the elementary SS1 Tones that make underlie the dial codes shown in the tree view.

Figure: Analysis Results – Tone View


Figure: Analysis Results – Tree View


File-Based Analysis

In Offline analysis, SS1 analyzer allows users to specify the folder containing the files for SS1 analysis. File formats supported are a-law, u-law pcm files

  • Analyze all files in a folder with a given file name extension, or
  • Analyze a specific file.

Figure: File Selection


WCS Connections

SS1 Protocol Analyzer is a client application and requires connecting to a T1 server. This allows SS1 Analyzer to be used locally or on a remote PC w/o actual T1 hardware installation. Use the WCS Connection options to set all the information required in order to establish a connection with the WCS server and correctly correspond with it.

SS1 Analyzer and the WCS server connection options -

  • Connect to server on This PC option allows SS1 Analyzer to run on the Capture PC.
  • Connect to server on… option allows SS1 Analyzer to run on a Remote PC

Figure: WCS Connection


Storage Options in Analyzer

Currently, only the CSV file format is supported by the SS1 Analyzer. This format is widely recognized by popular Windows Data Management and analysis tools such as Microsoft® Excel and Microsoft® Access.

Table Name Prefix option allows users to designate a prefix for all files to be saved. The rest of the file name will be made up of a text indicating the date and time of capture, followed by a suffix distinguishing between dial code, digit, and tone records.

Figure: Dial Code & Digit Results in CSV files


Review Dial Code and Spectral Display Tools

It is quite likely that you will want to examine a faulty dial code at length, or view as a graphical waveform even as a run is in progress. The SS1 Analyzer & Dialer provides an independent Review Dial Code, and Spectral Display window options for this purpose.

Figure: Review Dial Code

Figure: Spectral Display


SS1 Dialer

SS 1 Dialing Digits (Dialer) application provides the ability to setup and dial tone sequences that make up SS1 dial digits. The applications’ interface 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.

Figure: SS1 Emulator (Dialer)

Dial Modes

  • Key & Send – All digits are transmitted back-to-back with only the final space tone separating the successive digits in a single burst.
  • 2-Digit Burst – When the second digit is pressed, the digits are transmitted back-to-back in a single burst. A "1" digit always triggers a transmission, even if it is not the last digit.
  • 3-Digit Burst – same as 2-Digit Burst Dial, but Dial Code contains three digits. When the third digit is pressed, the digits are transmitted back-to-back in a single burst.
  • 2-Digit Direct Dial – the Dial Code are sent one-by-one as you key them. When two digits have been keyed and transmitted, the Dial Code is transferred to the Dial History (Display).
  • 3-Digit Direct Dial – same as 2-Digit Direct Dial, but Dial Code contains three digits. When three digits have been keyed and transmitted, the digit record is transferred to the dial code display.

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
XX626 SS1 Signaling Emulator and Analyzer
  Related Software
  Related Hardware
PTE001 tProbe™ Dual T1 E1 Laptop Analyzer with Basic Analyzer Software
HTE001 Universal T1 Card with Basic Analyzer Software
UTE001 Portable USB based Dual T1 Laptop Analyzer with Basic Analyzer Software

 Back to Protocol Analysis Index Page


 
 
Home Page Sitemap Global Presence Email