Specifications

Chapter 6 Troubleshooting and Diagnostics FCD-E1LC Installation and Operation Manual
6-2 Monitoring Performance
received checksum: any difference between the two checksums indicates that
one or more bit errors are contained in the current data block being
evaluated.
• When the CRC-4 option is disabled, most of parameters available with the
CRC-4 option enabled are available as well, but the line transmission
impairments are detected in a different way (based on bipolar coding
violations).
The main link performance data can be displayed by means of the DSP PM ML
command, and the sublink data – by means of the DSP PM SL command, as
explained in
Appendix D . The performance monitoring parameters are listed in
Table 6-1.
By adding the /CA switch to the command, you can reset all the performance
diagnostics registers.
Table 6-1. Performance Monitoring Parameters
Display Name Description
CURRENT ES Current errored
seconds
CRC-4 enabled: An errored second is any second containing
one or more of the following events: CRC error events, OOF
events, AIS events, controlled slip events.
CRC-4 disabled: An errored second is any second containing
one or more BPV events, or one or more OOF events, or one
or more AIS events, or one or more controlled slip events.
In both cases, the data is collected for the current
15-minute interval.
CURRENT UAS Current
unavailable
seconds
An unavailable second is any second in which a failed signal
state exists. A failed signal state is declared when
10 consecutive severely errored seconds (SES) occur, and is
cleared after 10 consecutive seconds of data are processed
without a SES.
CURRENT SES Current severely
errored seconds
CRC-4 enabled: A SES is a second with 832 or more CRC
error events, or one or more OOF events.
CRC-4 disabled: A SES is a second with 2048 or more BPV
events.
In both cases, the data is collected for the current
15-minute interval.
CURRENT BES Current bursty
errored seconds
CRC-4 enabled: A BES is a second with 2 to 319 CRC error
events and no AIS events. The data is collected for the
current 15-minute interval.
CRC-4 disabled: not relevant.
CURRENT LOFC Current loss of
frame counter
The loss of frame (LOF) counter counts the loss of frame
alignment events. The data is collected for the current
15-minute interval.
CURRENT LES Current line
errored seconds
A line errored second is a second in which one or more Line
Code Violation events were detected. The data is collected
for the current 15-minute interval.