Transcript
Through network (NT) simulation, the test set looks like the network to the equipment under test.
NT Simulation with the IBT-5: ISDN Equipment Installation Made Easy Using NT simulation on the ISDN basic rate interface (BRI), it is possible to generate calls (simulation of an incoming call from the network to the equipment), invoke basic services, teleservices and subscribed complementary services for the simulated BRI, and accept outgoing calls generated by the terminals. We break the complete installation procedure for a piece of ISDN equipment (e.g. a PBX) into three phases:
addressing plan and tests out the existing services and teleservices. Using NT simulation, calls are generated to the different terminal interfaces of the equipment. These calls are sent with a group of addresses (and sub-addresses if necessary) of calling and called parties associated with various services and teleservices, the idea being to cover all of the possibilities of the equipment. Phase 3 is a simple verification that the equipment works properly when connected to the network. TE simulation enables generation of different types 1. Verification of ISDN quality of service (QoS) of calls (telephony, fax, data, X.25 in D channel, provided by the operator etc.) to user-selected destinations. It is even 2. Verification of proper operation of the equipment possible to test the availability of subscribed being connected (seen from the network) prior supplementary services and to verify, for example, to connection to the network interface that all of the call re-direction functions work 3. Functional verification from the point of view properly. of the terminal after connecting the equipment Franck Bernard to the network.
ISDN and reference point functional groups
Of course, each of these three phases does not necessarily occur with each installation procedure. However, our experience has shown that by sticking to this model, installers can avoid a lot of equipment malfunctions which they would otherwise have to correct later. Phase 1 involves verifying the BRI QoS (check for presence of services and teleservices, and short BERT in TE simulation mode). Phase 2 is essential because it allows us to verify and modify the equipment configuration if necessary. This step checks the equipment's
Terminals TE 1
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ISDN switch
TA S
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NT simulation: Connected to the T (or S) interface, the tester simulates both the ISDN network and the network termination (NT1).
PBX S
TE 2
Product Manager Wandel & Goltermann, Division 2, France
IBT-5 NT simulation
The IBT-5 is evolving to meet the needs of installers in terms of quality of service, QoS. When equipped with the NT simulation option, the IBT-5 enables simulation of the ISDN network prior to connecting equipment using the following protocols: EDSS-1, 1TR6, 1TR67, SN3, TPH 1962 and VN3/VN4. This operating mode is in addition to TE simulation, and existing tests and functions are still available (call, automatic test of services, teleservices, supplementary services, BERT, loop-box, etc.). Already renowned as a simple, rugged yet powerful field tester, the IBT-5 is now the only such device on the market to provide complete simulation functions.
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