Alcatel-Lucent 1643 AMS - Parameters for Provisioning Degraded Signal Thresholds

Parameters for provisioning degraded signal thresholds
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Introduction
A Degraded signal is a signal with more Errored Blocks (EB) per second than the
defined EB Count value during a period of consecutive seconds defined in Duration
(sec). A degraded signal causes a Moderate Block Error Rate alarm. A degraded signal
(on VC-12 level)can cause an SNC/N or an MSP protection switch.
Degraded signal thresholds
Two Thresholds can be defined for each signal level to declare a signal degraded. The
thresholds are called Threshold 1 and Threshold 2. A choice between these two
thresholds can be made in the Edit STM-N Port Information window for the STM-N
signal and in the Edit Provisioned Termination Point window for the VC-4, and VC-12
signal.
Signal level
The signal levels on which the degraded signal thresholds can be set are STM-4,
STM-1, VC-4 or VC-12.
EB count
In the termination points the signal is terminated and a Bit Interleaved Parity (BIP)
check is performed on the received data. The result of this BIP check is compared to
the values in the B or V5 bytes in the overhead of the signal. When there is a
difference an errored block is detected. The EB Count value determines how many
Errored Blocks (EB) are allowed per second, before the second is declared a bad
second.
The following table shows the range for the values for each signal type.
Signal Type Range
STM-4 1...728000
STM-1 1..192000
VC4 1..8000
VC12 1..2000
Duration (sec.)
The number of consecutive bad seconds to declare a signal degraded.
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Issue 4, May 2007
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