Cisco 7513 Hardware Installation And Maintenance Manual page 76

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