VeEX MPA User Manual page 504

MPA_e_manual_D07-00-129P_RevA00
What causes an RDI alarm?
How to Insert Errors
How to Insert Alarms
What Causes a B2 Error?
A B2 error occurs when a parity error is detected at the Multiplex Section of the
incoming SDH signal. A B2 error is also known as a Multiplex Section BIP-8.
In general, the transmitting SDH equipment calculates the number of ones transmitted
in the data. This result is place into the Multiplex Section Overhead's B2 byte of the
following SDH frame. The receiving SDH equipment performs the same calculation and
compares the results. If the value calculated by the receiving SDH equipment equals
the value calculated by the transmitting SDH equipment, then the data contains no
errors. However, if the values are different, then a parity error has occurred.
B2 errors can be caused by dirty fiber connections, a faulty transmitter or receiver, or a
low receive-signal level.
Related Topics:
Unit reports Loss of Signal (LOS)
What causes a B1 error?
What causes a B2 error?
What causes a B3 error?
What causes an AIS alarm?
What causes an RDI alarm?
How to Insert Errors
How to Insert Alarms
What Causes a B3 Error?
SDH Tab
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