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Call yourself BERT testing of ISDN line
| Details |
Inventors: Kennedy, Michael; Katz, Paul H.; Soto, Roy L.;
Assignee: Harris Corporation (Melbourne, FL)
Primary Examiner: Nguyen; Duc
Assistant Examiner:
Attorney, Agent or Firm: Allen, Dyer, Doppelt, Milbrath & Gilchrist, P.A.
A portable ISDN test set contains test circuitry that is controllably operative to automatically test the ISDN communication capability of an ISDN circuit. In response to a user operating a prescribed input/output element of a user interface of the test set, the test set's supervisory control processor executes a routine that places an ISDN call over a first bearer channel of the ISDN circuit, the first bearer channel having a first directory number, through a public switched telephone network to a second directory number associated with a second bearer channel of the ISDN circuit. The ISDN call is thus routed by the public switched telephone network back to the ISDN test set. When the ISDN call is received by the test set, it is automatically looped to the public switched telephone network, so that the call is rerouted to the first directory number associated with the first bearer channel to the ISDN test set. When the looped back call is answered, a BERT is conducted over the dual looped bearer channel pair, thereby testing the full 128 Kbps bearer channel bandwidth of the ISDN circuit. The automated testing routine includes a subroutine that automatically derives the first and second directory numbers from respective user-supplied service profile identifiers for the first and second bearer channels. |
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DETAILED DESCRIPTION The present invention is directed to an enhancement of the ISDN communication and testing capability of the test set described in the '117 application, that not is only capable of performing line prequalification and post installation testing, but does so in a manner that simplifies the interaction between the user/craftsperson and the test set, thereby minimizing line testing inaccuracies (which often depend upon the skill and familiarity of the technician with ISDN communications) and improving performance.
In this regard, it has been observed that perhaps the most frequently (if not always) conducted exercise by a service technician dispatched to troubleshoot an ISDN line is a BERT.
Indeed, in many cases, the BERT may be the only test that is performed by the craftsperson; if the line passes the BERT, the craftsperson is done--no further testing of the line is necessary.
As a consequence, the simpler the procedure for conducting the BERT--the better.
Since each bearer channel of an ISDN line is capable of individually supporting 64 Kbps of traffic, it is necessary to test each bearer channel.
If a BERT is performed on each channel separately, the time required to test the channels individually is at least doubled.
Moreover, since an ISDN customer may simultaneously utilize the full bandwidth capability of both channels, e.
g.
, for 128 Kbps internet access, it is necessary to conduct a BERT of both bearer channels at the same time.
In accordance with the invention, both of these objectives--simplicity and simultaneous 128 Kbps bearer channel bandwidth testing--are successfully accomplished by what is an extremely simplified (from the craftsperson/user's perspective) BERT message exchange sequence, that only requires the service technician to enter supplied service profile identifiers (SPID)s and operate two function keys on the test set--the MENU key (that calls up a menu listing the BERT as an option), and an AUTO (for automatic) softkey option on the displayed menu
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Control Computers 
