TSW200E1
4 - The BERT/BLERT Module
This module has two modes: Synchronous and Asynchronous. See the screen below.
To choose between one of the two modes move the cursor, with the ↑ and ↓ keys, to the
corresponding desired mode and press <F3> (ENTER). The first screen for the chosen module setup
will be displayed.
For the two modes, the test counts the bit error rate (BER) and the rate of errored blocks
(BLER). This test allows checking:
• degraded minutes
• severely errored seconds
• errored seconds
• error-free seconds
• available time
• unavailable time
• real-time clock SLIPS following ITU-T Rec. G.822.
The test is based on a data pattern that is transmitted to the modem under test. The received
data pattern is then compared to the transmitted pattern, and the occurrence of any error is
accounted for. Before the test is started, the user must be sure that every parameter has been
adequately selected according to the modem strapping.
4.1 - Synchronous Mode Configuration
Before running the test, it is necessary to set many configuration parameters. The figures
below present the two screens used to configure this mode.
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