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2-54 Operation, administration, and maintenance (OAM) features
Facility attributes
Visible and provisionable facility attributes include the following:
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All supported facility attributes (except loopbacks) are default provisioned
when equipment is provisioned.
Loopbacks
Terminal loopback
A terminal loopback routes an incoming signal towards the backplane. An
alarm indication signal (AIS) is generated in the outward direction of the
signal.
Facility loopback
During a facility loopback, a signal received on the optical or electrical side of
the facility is looped back towards the associated return transmitter An alarm
indication signal (AIS) is generated in the onward direction of the signal. To
operate a facility loopback, the facility must be manually put out of service
(OOS).
Facility loopback implementation complies with the latest issues of:
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Refer to
OPTera Metro 3500 Multiservice Platform
Signal degrade threshold (SDTH)
Auto in service (AINS)
Section trace
Path trace
Equalization (DS1)
Frame Format (DS1)
Line build out (DS3, EC-1)
DS1, DS3, and EC-1 loopbacks
Note: The facility must be out-of-service before a loopback is permitted
and both types of loopback cannot be active for a given facility at the same
time.
GR-253-CORE, Synchronous Optical Network (SONET) Transport
Systems: Common Generic Criteria
GR-819-CORE, Network maintenance: Access and Testing - Special
Services (SS) and SS-like networks
Figure 2-29
for details on electrical loopback types.
NTRN10AN
Rel 12.1 Standard Iss 1 Apr 2004
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