RTRV-ALM
17
of
8
Page
RTRV-ALM
Description
Report
Description
Report
(Contd)
Descriptions
RTRV-ALM
11-3.
Table
Meaning
Description
from
received
being
is
(AIS)
signal
indication
alarm
DS1
signal.
reference
synchronization
DS1
the
facility
or
equipment
upstream
of
Failure
causes:
Likely
DSX-1).
the
(towards
AIS
ref.
sync.
DS1
inc.
synchronization
DS1
the
in
(BER)
ratio
error
bit
The
10
exceeds
signal
reference
−
3
.
facility
or
equipment
upstream
of
Failure
causes:
Likely
DSX-1).
the
(towards
BER
ref.
sync.
DS1
inc.
in
detected
were
events
(OOF)
out-of-frame
Excessive
Excessive
signal.
reference
synchronization
DS1
the
in
events
out-of-frame
512
than
more
as
defined
is
OOF
day.
one
DS1
incoming
the
of
Failure
cause:
Likely
signal.
reference
synchronization
EOOF
ref.
sync.
DS1
inc.
DS1
the
on
frame
to
unable
is
system
The
signal.
reference
synchronization
providing
clock
the
in
failure
Upstream
causes:
Likely
received
the
on
ratio
error
bit
high
signal;
reference
the
that
supply
timing
office
the
of
failure
by
caused
signal,
is
system
the
reference;
timing
DS1
the
provides
DS1
specified
the
on
format
SF
for
provisioned
DS1
received
the
and
signal
reference
synchronization
format.
ESF
in
is
signal
LOF
ref.
sync.
DS1
inc.
DS1
the
in
received
were
zeros
consecutive
128
least
At
the
at
energy
the
or
signal,
reference
synchronization
threshold.
preset
a
below
is
input
DS1
that
supply
timing
office
the
of
Failure
causes:
Likely
the
of
failure
or
reference
timing
DS1
the
provides
supply.
timing
the
to
connection
LOS
ref.
sync.
DS1
inc.
OC-12
DDM-2000
1997
December
1
Issue
11-363
