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Hand Held ISDN Tester—User Guide
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Testing Service
Availability
This section explains how to test the availability of
telecommunications services for ISDN calls, and TEI
availability for X.25 operation.
Bearer services and teleservices
A bearer service (e.g. Data 64K) provides the basic capability
for transmission of signals between user-network interfaces. A
teleservice (e.g. Telex) provides the complete capability for
communication between users by means of terminals, network
functions etc., according to established protocols.
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