Carrier Access Broadmore 1750 - Manual (Page 142)

7-28 Broadmore 1750 - Release 4.6
Configuration
NIM Redundancy
5. In the redundancy configuration on the Protection Parameters shown above,
the Command field choices are prioritized per the SONET GR-253-CORE
specification. The available choices in priority order top-to-bottom are:
Lockout
Force A
Force B
Switch to A
Switch to B
Clear
The Command Request field indicates the current request status and cannot be
changed. The command “Clear” is not prioritized but it acts to remove the last request
from its control station. This means that a command (i.e., choice) will not be activated
if there is a higher priority current request shown in the Command Request status
portion of the display. Broadmore generated requests such as “SD- Signal
Degradation” are not shown on the screen but they fall in the priority list between
“Force B” and “Switch to A”. In other words, a command “Force B” will switch the
Broadmore to NIM B regardless of signal degradation, while a command “Switch to
B” will be ignored in the same circumstance if there is a current SD request. A
Command Request can be received from any user interface.
6. Set the Parameters for Bit Error Rate (BER) Thresholds in the right part of the
display. Enter a desired number “x” for each threshold, remembering that the
degrade threshold (SD) should be a larger “x” than the failure threshold (SF)
and thus a smaller number. The parameter entered is defined by the equation
Threshold = 10
–x
where “x” is the user-entered number. If the redundancy chosen is revert, then
the parameter “Revert Time” will be active and the number of minutes before
the system automatically reverts to the original primary NIM may be entered.
7. Switching the protection installation changes module and call configurations.
Follow any change to redundant configuration by immediately rebooting
the system.