Site
Requirements
Table
2-10
lists
the
factors
that
contribute
to
link
loss
and
the
estimate
of the
link
loss
value
attributable
to
those
factors
Table
2-10
Estimating
Link
Loss
Link
Loss
Factor
Estimate
of Link
Loss
Value
Higher
order
mode
losses
0.5
dB
Clock
recovery
module
dB
Modal
and
chromatic
dispersion
Dependent
on
fiber
and
wavelength
used
Connector
0.5
dB
Splice
0.5
dB
Fiber
attenuation
dBfkm
After
calculating
the
power
budget
minus
the data
link
loss
the
result
should
be
greater
than
zero
Results
less
than
zero
may
have
insufficient
power
to
operate
the receiver
For
SONET
versions
of the
AlP module
the signal
must meet
the worst
case
parameters
listed
in
Table
2-11
Table
2-11
AlP
SONET
Signal
Requirements
Multimode
15
Single-Mode
PT
18.5
PR
30
PB
11.5
28
13
Multimode
Power
Budget
Example
with
Sufficient
Power
for
Transmission
The
following
is
an
example
calculation
for
multimode power
budget
based on
the following
variables
Length
of
multimode
link
kilometers
km
connectors
splices
Higher
order
loss
HOL
Clock
recovery
module
CRM
Estimate
the
power
budget
as
follows
PB
11.5
dB
km1.0
dB/km
40.5dB
0.5
dB
0.5
dB
HOL
dB
CRM
PB11.5dB3dB2dB1.5dBO.5dBlcJB
PB
2.5dB
The
value
of 2.5
dB
indicates
that
this
link
would
have
sufficient
power
for transmission
Preparing
for Installation
2-11
Summary of Contents for 7513 Series
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