Regeneration
Mode
Switch
–
The
REG1
and
REG2
switch
position
is
determined
by
the
data
rate
of
the
RS
‐
422
link
and
the
distance
between
the
DCE
and
the
DTE.
In
some
cases,
if
the
timing
delays
are
just
right,
a
link
will
function
in
2
switch
positions,
NON
and
REG1,
or
NON
and
REG2.
It
is
also
possible
for
a
link
to
operate
in
all
3
switch
positions;
NON,
REG1,
and
REG2.
However,
in
synchronous
applications
where
the
DCE
provides
Send
Timing
(ST),
it
would
be
more
beneficial
to
use
either
REG1
or
REG2
rather
than
NON
because
regeneration
eliminates
the
sampling
jitter
from
the
Transmit
Data
(TD)
to
the
DCE.
See
the
table
below.
Label
Position
Description
NON
Up
Typically
set
for
asynchronous
or
synchronous
applications
requiring
Terminal
Timing
(TT).
Transmit
Data
(TD)
and
Terminal
Timing
(TT)
from
the
DTE
are
both
passed
transparently
to
the
DCE
with
the
addition
of
normal
propagation
delay
and
sampling
jitter.
Regeneration
Modes
Typically
set
for
synchronous
applications
requiring
Send
Timing
(ST).
This
may
be
used
to
correct
for
timing
delays
over
long
runs
of
wiring
between
the
DCE
and
the
DTE.
Terminal
Timing
from
the
DTE
is
ignored
and
will
not
be
passed
to
the
DCE.
Instead,
Send
Timing
(ST)
from
the
DCE
is
looped
back
to
the
Terminal
Timing
(TT)
output
on
the
TD
‐
1580.
REG1
Middle
Transmit
Data
(TD)
from
the
DTE
is
sampled
in
on
the
rising
edge
of
Send
Timing
(ST)
from
the
DCE.
REG2
Down
Transmit
Data
(TD)
from
the
DTE
is
sampled
in
on
the
falling
edge
of
Send
Timing
(ST)
from
the
DCE.
SIG
(signal)
&
SYN
(sync)
–
LEDs
indicating
the
status
of
signal
presence
or
absence,
and
sync
character
detection.
See
the
table
below.
Label
Color
Description
SIG
Green
Optical
signal
in
detected.
Off
No
optical
signal
in
or
optical
level
too
low.
Check
that
the
opposite
unit
has
power
and
that
the
fiber
optic
cables
are
properly
connected.
The
TX
optic
from
one
end
of
the
network
connects
to
the
RX
optic
at
the
opposite
end
as
shown
under
“TYPICAL
APPLICATION”.
SYN
Green
Unit
is
in
sync.
Off
No
sync
characters
detected.
Unit
is
unable
to
frame
to
the
data
stream.
SFP
Port
–
Install
an
optical
SFP
in
this
slot.
This
slot
conforms
to
the
SFP
MSA
pinouts
(INF
‐
8074i,
more
information
later
in
this
manual).
Any
standard
MSA
complaint
optical
SFP
can
be
used
in
this
slot
that
supports
a
minimum
data
rate
of
346Mbps.
Units
ordered
with
the
“
‐
L5B”
and
“
‐
L22”
option
come
with
an
appropriate
SFP
pre
‐
installed.
The
“
‐
C”
option
has
an
empty
SFP
cage
that
can
accept
either
a
user
supplied
SFP
or
a
Quadrax
SFP
‐
SFP
cable
(ordered
separately)
for
connection
to
the
FiberPlex
WDM16
or
WDM8.
PWR
–
LED
indicating
presence
of
DC
power
in
the
unit.
The
LED
can
be
interpreted
according
to
the
following
table.
Status
Indicator
Green
Power
supply
in
FOI
unit
is
operating
properly.
Off
No
power
from
the
PSQ
power
supply
or
open
resettable
fuse
inside
the
FOI
unit.
Check
that
the
PSQ
power
supply
is
operating
properly.
If
the
PSQ
power
supply
is
good,
separate
the
FOI
unit
from
the
PSQ
power
supply
for
30
seconds
and
then
reattach
so
that
the
fuse
inside
the
FOI
unit
has
time
to
reset.
If
the
PWR
led
is
still
off
or
not
constant,
replace
the
FOI
unit.
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