Cisco 7513 Hardware Installation And Maintenance Manual page 77

Site
Requirements
Multimode
Following
link
PB
PB
PB
The
due
to
with
Single-Mode
The
longer
occur
monochromatic
The
receiver
to
overloading
between any
SONET
The
connected
Length
12
Estimate
PB
PB
PB2.5dB
The
in
excess
Using
Statistical
Determining
data
further information
specifications
7513
2-12 Cisco Hardware
Power
Budget
with the
an
is example
km
distance of
4km
dB
11.5
dBIkm
1.0
4dB2dB
dB
11.5
dB
1.5
dB
value
of indicates
1.5 that
on
the dispersion the
limit
multimode
fiber In
this case
Transmission
signal source
single-mode
because
distances there
In addition chromatic
dispersion
maximum
overload
specification
when
be
overloaded
can
dB
The be
receiver could
the receiver
connecting
SONET
single-mode
Power
Single-Mode
of
example
following single-mode
through patch panel
of single-mode link
connectors
the follows
power budget as
km
dB
11.5 0.5
11
dB dB
dB
11.5 5.5
dB
value of 2.5 indicates
that
maximum
of the receiver
Estimate
Statistics to
models more
accurately
the link
loss
with
link
components Statistical
UNI Forum
refer
to
and Maintenance
Installation
of
Example
Dispersion
the preceding
same
as
parameters
40.5dB
0.5
1.5 0.5
dB dB dB
link
this would have
sufficient
MHz
4km
155.52
link
would
fiber
single-mode
diode Single-mode
is an injection laser
single transmission
is
path
reduced because
is also
on
receiver
the
single-mode
using short lengths of
fiber
14
dB
overloaded but
at
short
fiber insert
links
and
transmitter the receiver
Budget Example
power budget
is
in an
intervening building
km
11
dB
dB/km
120.5
would have
link
this sufficient
input
power
Power
the
Budget
determine the power budget
methods
statistical
requires
is
power budget analysis
ITU-T
specifications
Limit
but with
example
0.5 HOL
dB
dB dB
for transmission
power
MHzkm
500 would
link
this
be choice
the
better
transmission
is
and smear
within the
fiber
is essentially
laser
light
14 dBm
The
is
single-mode
because the transmitter can
no damage To
result
will prevent
dB on
10 attenuator
to
of kilometers
two 11
buildings
with of 12 connectors
total
for transmission
power
method
than the worst-case
accurate knowledge of variations
document
the scope of
beyond this
and your equipment
standards
multimode
CRM
however
work
not
useful for
does
not
transmit
up
the link
apart
and
is not
in the
For