Cisco 7000 Series Hardware Installation And Maintenance page 76

Table 2-8 the
factors that
lists
those factors
attributable
to
Table 2-8
Estimating
Loss
Link Factor
mode
order losses
Higher
Clock
module
recovery
Modal
and chromatic
dispersion
Connector
Splice
Fiber attenuation
After calculating the
power budget
have
Results than
less may
zero
SONET
AlP module
For
versions of the
2-9
Table
in
SONET
AlP
Table 2-9
Multimode
Single-Mode
15
PT 18.5
30 28
PR
13
PB 11.5
Power
Multimode
Budget
The example multimode power budget
is an
following
multimode
of link
Length
connectors
splices
HOL
Higher order
loss
CRM
Clock module
recovery
Estimate the
power
budget as
PB dB
11.5 km1.0
PB11.5dB3dB2dB1.5dB0.5dBldB
PB2.5dB
The dB
value of 2.5 indicates
contribute and
link the estimate
to loss
Loss
Link
Loss Value
Estimate of Link
dB
0.5
dB
on and wavelength
fiber
Dependent
dB
0.5
dB
0.5
dBlkm
minus
the data link loss
insufficient
power
to operate
must meet
the signal
Minimum
Requirements
Signal
with
Sufficient
Example
calculation
kin
kilometers
follows
dB
dB/km
0.5 0.5
link would have
that
this sufficient
of the
link loss value
used
the should be greater than
result
the receiver
minimum
the
parameters
Power
Transmission
for
based on the following
HOL
CRM
dB 0.5
dB dB
transmission
for
power
Preparing
Site
Requirements
zero
listed
variables
2-11
for Installation