indicator (RFI) alarm. Metropolis
®
DMXplore generates the following
remote defect indication signals:
•
For SONET Lines, loss of signal (LOS), loss of frame (LOF),
and alarm indication signal (AIS-L) are the defects that cause the
line terminating equipment (LTE) to send an RDI-L back
upstream to the originating LTE which then declares an
inc.
OCN RFI-L
on the line.
•
For SONET STS Paths, loss of pointer (LOP-P), unequipped
(UNEQ-P), and alarm indication signal (AIS-P) are the defects
that cause the path terminating equipment (PTE) to send an
RDI-P back upstream to the originating PTE which then declares
an
inc. STSN RFI-P
on the STS path.
•
For SONET VT Paths, loss of pointer (LOP-V), unequipped path
(UNEQ-V), and alarm indication signal (AIS-V) are the defects
that cause the path terminating equipment (PTE) to send an
RDI-V back upstream to the originating PTE which then declares
an
inc. VT RFI-V
on the VT path.
Important! RFI-P and RFI-V are not reported at non-path
terminating points because they are not actionable and because
the impacted service is not terminated at that node.
Path unequipped signals
Metropolis
®
DMXplore supports STS-N and VT1.5 path unequipped
signals. Path unequipped signals are transmitted to notify downstream
equipment that the path is incomplete (for example, the absence of a
valid cross-connection).
Maintenance signals
Maintenance overview
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4 - 6
Lucent Technologies
365-372-333 R2.1
Issue 4, June 2005
