Dell Force10 C150 Configuration Manual page 1011

While performance monitoring provides advanced alert of link degradation, alarms indicate a failure. Fault
management involves alarm monitoring and generation, reporting, logging, correlation, and clearing.
E-Series POS and 10GE WAN interfaces support the SONET alarms shown in
• Section alarms—SLOS, SLOF
• Line alarms—AIS, RDI, FEBE(REI), SD, SF
• Path Alarms—AIS, RDI, FEBE(REI), LOP
Since E-Series is Terminal Equipment (TE), it must support the alarms in
Table 49-1. Supported SONET Alarms
SONET/SDH Layer
Section/Regenerator
Line/Multiplexing
Path/Section
Alarm Description
LOF Loss of Frame condition—when a severely errored frame (SEF)
defect on the incoming SONET signal and persists for 3 milliseconds
LOS Loss of Sync condition—when an all-zero pattern on the incoming
SONET signal last 19 (+/-3) microseconds or longer. This defect
might also be reported if the received signal level drops below the
specified threshold.
AIS Line Alarm Indication Signal is sent by the section terminating
equipment (STE) to alert the downstream line terminating equipment
(LTE) that a LOS or LOF defect has been detected on the incoming
SONET section.
RDI Line Remote Defect Indication is reported by the downstream LTE
when it detects LOF, LOS, or AIS.
FEBE Line Far End Block Errors (accumulated from the M0 or M1 byte) is
reported when the downstream LTE detects BIP (B2) errors.
SD Signal Degrade is sourced from B2 BIP (BER). The threshold is fixed
at 10^6.
SF Signal Failure is sourced from B2 BIP (BER). The threshold is fixed
at 10^3.
AIS Path Alarm Indication Signal is sent by the LTE to alert the
downstream path terminating equipment (PTE) that it has detected a
defect on its incoming line signal.
RDI Path Remote Defect Indication is reported by the downstream PTE
when it detects a defect on the incoming signal.
FEBE Path Far End Block Errors (accumulated from G1 byte) is reported
when the downstream PTE detects BIP (B3) errors.
LOP Loss of pointer is a result of an invalid pointer (H1,H2) or an excess
number of new data flag (NDF) enable indications.
Table 49-1:
Table 49-1.
SONET/SDH | 1011