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HOW TO TEST SERIAL CONNECTION CODE
Specifies the kind of loop up code to send to the far Specifies the rate at which single bit errors are Specifies the length of time for which a BERT is to This chapter contains the following commands. To restart the system use the reboot command. To restart the wanpipe service enter the following command from the command line: This can be fixed by either restarting the wanpipe service or restarting the system. NOTE A test in which a requested loopup code fails may cause the serial interface to become non responsive. NOTE For tests that use a hardware loopback plug, be sure to configure the serial interface for internal clock. BERT parameters are defined in configuration mode BERTs are run from operational mode. Once defined, the test can be run by referencing the test and the WAN interface on which the test is to be run. Although the Sangoma T3/E3 family of cards supports serial loopbacks, it does not provide BERT functionality.įor Sangoma T1/E1 cards, parameters can defined for a BERT test and saved under a test name. The Sangoma T1/E1 family of cards supported by the Vyatta system includes features that allow a BERT to be run directly from the Vyatta system. For example, the QuasiRandom Signal Source pattern can be used to test jitter (delay) in a circuit, while a pattern of all zeros is effective in discovering Alternate Mark Inversion options (a type of line encoding) have been misconfigured. The bit stream of the BERT involves a stress pattern different stress patterns exercise the circuit in different ways. A BERT counts the number of bits received in error and calculates a bit error rate (BER) figure. The bit stream returned should be identical to the one sent. A BERT is accomplished by setting up a loopback at some point in the circuit, then sending a bit stream into the circuit and monitoring the returned bit stream.