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~ Nx8 ID: xxxxx Sys:3.1 FPGA:2.2 Ser:0 00017:21:51
~- CpA=L CpB=L Channels: A A A A A A A A B B B B B B B B LPwr=x+ RPwr=..
-----------------------------------------------------------------------------
COMPOSITE LINK ERRORS
WHEN IN SYNC Link A RX Link A TX Link B RX Link B TX
Link hits in last minute: 0 0 0 0
Hits over last 00017:21:51: 0 0 0 0
Hits since box reset: 0 0 0 0
Sync losses since box reset: 0 0 0 0
Link A hits per minute thresholds for Backup/Recovery: 300 / 125
Link B hits per minute thresholds for Backup/Recovery: 250 / 100
[1] - Set Composite A Backup Threshold
[2] - Set Composite A Recover Threshold
[3] - Set Composite B Backup Threshold
[4] - Set Composite B Recover Threshold
[5] - Clear 'Hits over last xxxxx:xx:xx' Counters
Make Selection [FLASH NOT UPDATED]
ENTER:
Figure 20
“Link hits” are typically single-bit errors that are detected in the framing pattern that do not
result in loss of synchronization. The hit/minute threshold is the level at which the system will
declare a link alarm regardless of the state of the Sync signal for that link.
When determining the threshold, consideration should be given to the fact that the composite
link bandwidth over which the error-detection circuit is working is 6Kb/s. Therefore a link BER
of 10-4, for example, would result in an average of about 36 hits per minute (6000 bps x 10-
4BER x 60sec/min).
Transmit data (TX) link hits are detected by the remote multiplexer and provided via the in-
band management channel back to the local multiplexer for display.
4.7.1.1 Composite Link Statistics Menu options
The following illustrates the menu options for the Status/Configuration Functions Menu:
Composite Link
Statistics
1
[1] - Set Composite A Backup Threshold
[2] - Set Composite A Recover Threshold
[3] - Set Composite B Backup Threshold
[4] - Set Composite B Recover Threshold
[5] - Clear 'Hits over last xxxxx:xx:xx' Counters
Figure 21
Choosing each option performs the following commands:
Option [1] : Set Composite A Backup Threshold
Sets the error rate per minute threshold at which the Composite Link A Alarm is raised.
Option [2] : Set Composite A Recover Threshold
Sets the error rate per minute threshold at which the Composite Link A Alarm is lowered.
Option [3] : Set Composite B Backup Threshold
Same as option [1], but applies to Composite link B.
Summary of Contents for Nx8- Dual Composite MUX High-Speed 16-Port TDM Multiplexer
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