GL Announces DDS Protocol Analysis Software


GL Communications Inc., announced today its latest Protocol Analyzer for Digital Data Service (DDS).

Speaking to the press, Mr. Vijay Kulkarni, the CEO of the company said, “In late 1970’s to late 1980’s ATT offered a pure private line digital data service called Dataphone Digital Service, or DDS.  Supported rates of 2.4, 4.8, 9.6, and 19.2 were standard with higher rates such as 56 kbps, and n x 56 kbps also possible but rarely.  These circuits although legacy, still are quite common TODAY - because they work!  Circuit design is as shown above.  Specialized channel cards called OCU-DP (Office Channel Unit Data Port) are connected to standard CSU/DSUs with datacomm interfaces as shown in the above diagram. ​

Both synchronous and asynchronous data is formatted and fit cleanly into a 64 kbps timeslot (by repeating the data bits or bytes). The bit repetition had the added advantage of providing error correction and thus better performance.  The channel data is then inserted into timeslots of a standard T1.  In this manner many data circuits can be packed into a private line T1. “

He added, “GL supports non-intrusive monitoring and analysis of DDS frames using T1 Analyzer hardware. The captured data can be decoded and analysed by GL’s DDS Protocol Analyzer.”

Mr. Kulkarni further explained, “Non-intrusive TAPs are used to passively duplicate the signal between two end points on a network link without disturbing the actual network activity. GL’s T1 Analyzer hardware can be used with RJ48 Y Bridge - splits one RJ48 into two complete- to non-intrusively tap and capture the DDS frames on a T1 line.”

He added, “The DDS data is formatted into frames separated by one or more bytes. The data channel may utilize multiple, all or a fractional timeslot of the T1 line. Also, there may be multiple data channels within the T1 line. The captured data analyzed using GL's DDS Protocol Analyzer.”

Important Features

•Displays Summary, Detail, and Hex-dump views
•Streams can be captured on the selected time slots (contiguous or non-contiguous), sub-channels, or full bandwidth.
•Frames can be captured in either 64 kbps, 56 kbps, n x 64 kbps, or n x 56 kbps data channels (hyper-channels)
•Exports Summary View information to a comma delimited file for subsequent import into a database or spreadsheet
•Capability to export detailed decode information to an ASCII file
•Status bar displaying information regarding running percent utilization, Number of frames captured and Frame errors etc
•Multiple trace files can be loaded simultaneously with different GUI instances for offline analysis

About GL Communications Inc.,

GL Communications Inc, is a global provider of test and measurement solutions and has over the years worked with major telecom equipment vendors, service providers, and system integrators to meet the testing requirements arising at various stages of telecom products development life cycle.

GL offers a broad set of test solutions that help perform all types of testing on networks, from initial system design, to fine-tuning, troubleshooting, live deployment, and monitoring. The products are widely used to verify and ensure 'quality and reliability' of Wireless (4G LTE, 3G, 2G), SONET/SDH, IP, TDM, and PSTN networks.

GL core product development is backed by a strong team of R&D experts to match evolving market and technical challenges in a most cost-effective and innovative way.


Shelley Sharma

Phone: 301-670-4784

E-mail: info at

Source: GL Communications Inc


Categories: Telecommunications

Tags: DDS Protocol Analysis, DDS Protocol Analyzer, DDS Protocol Tester

About GL Communications Inc

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GL Communications Inc. provides unique, targeted PC-based test, analysis and simulation products and consulting services to the worldwide telecommunications industry.