NT Simulation with the IBT-5: ISDN Equipment Installation Made Easy

NT Simulation with the IBT-5: ISDN Equipment Installation Made Easy
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
R
NT 2
NT 1
U
LT
ISDN
switch
TA
S
APPLICATIONS
30
bits 8015
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.
Wandel & Goltermann bits 80
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