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LPB 110, a System for
Controlled Test Traffic
Bengt Jansson, Kent Johansson and Tommy Ostlund
In the testing of telecommunication systems demands are made for shorter test
times and at the same time the equipment being tested becomes increasingly
complex. Powerful and efficient aids are therefore required, primarily for the
testing of whole systems. Ericsson has developed such a test system. LPB 110,
which has been designed to generate and terminate test traffic.
The authors describe LPB 110 and how it can be used for design, production and
installation testing of Ericsson systems and also other systems.
UDC 621 395.2/ 3.001 4
Fig. 1
Test equipment developed during the 1930s,
1950s and 1970s
Over the years various types of devices
have been used for testing telephone
equipment at system level. These test
devices have often been developed for
specific applications, fig. 1.
The need for more general test equipment
has arisen for various reasons,
partly because of the rapid technical development
in the field of telecommunications.
New demands have been
made on existing test equipment, and
new test requirements have arisen for
newly developed system parts. Demands
from the users have led to a modular
structure, so that the equipment
can easily be modified for different requirements,
and the same facilities for
man-machine communication as in
stored program controlled telephone
exchanges.
In order to exploit design resources efficiently
they were brought together in a
project, in which all requirements were
formulated in collaboration with representatives
from the system and installation
testing departments The test system
developed in accordance with these
requirements, LPB 110, can be used for
all autonomous testing at signal interfaces
towards telephone equipment, for
example towards MDF, where LPB 110
can simulate the environment of a telephone
exchange, fig 2.
Test facilities
LPB 110 has been designed to generate
and terminate controlled test traffic, primarily
in connection with design, production
and installation testing, including
acceptance testing, but it can of
course also be used for testing equipment
in service, for example for traffic
route testing.
LPB 110 can simulate the functions of
the subscriber and junction lines in the
surrounding network and hence can
simulate all connection types, i.e. local,
incoming, outgoing and transit calls.