System information
FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Performance Parameters of a Transmission Link
Page 2-82 Proprietary Information Aastra
• degraded operation
• severely degraded operation.
The Central Unit of the node uses the number of bit errors counted to
determine the bit error ratio and records the transmission quality during the
entire measuring time in five performance levels depending on the bit error
ratio:
• Error-free time
• Errored seconds
• Errored minutes (BER > 110
-6
)
• Severely errored seconds (BER > 110
-3
)
• Unavailable time (more than ten severely errored seconds in a row).