User Manual

ADCP-75-192 • Issue D • October 2005 • Section 7: Autonomous Software Functionality
Page 7-3
 2005, ADC Telecommunications, Inc.
Set the delay value in the Hub SIF’s to make them equal to the base delay plus some delay
skew based on the RAN ID.
The amount of delay skew is based on the Reverse Delay Skew configured in the Tenant OAM
MIB (See Tenant Configuration section of this document) and the RAN ID using the
following:
Total Delay = Base delay + (delay skew X(RAN ID -1)).
6 FORWARD CONTINUITY
Forward Continuity Management (FCM) is a software function that works in conjunction with
Forward Gain Processing (FGC) and is responsible for ensuring that the forward RF paths are
functioning properly and are able to pass signals.
The FCM process runs continuously on a periodic basis (once per minute) and reports any path
failures as faults in the FGC MIB. If fault conditions are no longer present, then the fault
indication will be cleared. Typical events that will clear a fault include:
• Replacement of failed module
• Power failure, followed by power restore
• Autonomous action (E.g. PLL out of lock, re-tune, module okay)
• Intermittent failure.
• Disabling BIM test tones in the case where the BIM is bypassed in the forward path
The following descriptions outlines the logical process by which system level faults are
detected and isolated, where possible, to a particular module:
6.1 HUB
The FCM process will check to verify BIM test tones are enabled, and if so notify the BIM to
inject test tones on one of the 8 tenant-sector channels. The FSC power for the corresponding
channel will be read and checked to be sure that it is no less than 3 dB below the target value
for the BIM Tone. If the signal level is 3 dB below the BIM tone level, a fault will be flagged
for that channel. Once all channels are checked then the module isolation is performed to
determine which piece of hardware is likely failing:
In the case of a single HDC card:
• If all channels fault, then the BIM module is declared to be at fault.
• If not all channels fault, then either the HDC or FSC module is declared to be at fault.
In the case of a dual HDC card:
• If all channels fault, then the BIM module is declared to be at fault.