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T1/E1 & T3/E3 Commands
2-72 Configuring T1/E1 and T3/E3 Subsystems
Mode
Controller
configuration:
XSR(config-controller
xx
)#
Default
1
Example
The
following
example
configures
the
E3
controller
in
slot
1
,
card
2
with
line
source
clocking
and
a
national
reserved
bit
of
0
:
XSR(config)#controller e3 1/2/0
XSR(config-controller<E3-1/2/0>)#clock source line
XSR(config-controller<E3-1/2/0>)#national bit 0
scramble
For T3/E3 controllers only
This
command
assists
clock
recovery
on
the
receiving
end
of
a
T3/E3
port
by
randomizing
the
pattern
of
1s
and
0s
carried
in
the
physical
layer
frame.
Randomizing
the
bits
can
prevent
continuous,
non
‐
variable
bit
patterns,
in
other
words,
long
strings
of
all
1s
or
0s.
Several
physical
layer
protocols
rely
on
transitions
between
1s
and
0s
to
maintain
clocking.
Scrambling
can
prevent
some
bit
patterns
from
being
mistakenly
interpreted
as
alarms.
The
following
conditions
must
be
met:
•
Scrambling
is
used
only
for
full
‐
rate/sub
‐
rate
T3/E3
ports
and
they
must
be
configured
as
unchannelized
for
scrambling
to
take
affect.
•
Remote
and
local
T3/E3
scrambling
configuration
must
match
.
•
For
T3
controllers,
all
DSU
modes
support
scrambling
except
Clear
mode.
•
For
E3
controllers,
only
Kentrox
mode
supports
scrambling.
•
This
value
is
configurable
only
on
an
unchannelized
T3/E3
port.
Syntax
scramble
Syntax of the “no” Form
The
no
form
of
this
command
disables
scrambling:
no scramble
Mode
Controller
configuration:
XSR(config-controller
xx
)#
Default
Disabled
Содержание X-Pedition XSR
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