參數(shù)資料
型號： HFBR-5207
英文描述： 622 Mbps Multimode Fiber Transceiver for ATM,SONET STS-12/SDH STM-4(應用于 ATM,SONET STS-12/SDH STM-4的622 Mbps多模式光收發(fā)器)
中文描述： 622 Mbps的多模光纖收發(fā)器（應用于自動取款機，SONET的STS-12/SDH的STM - 4的622對ATM，SONET的STS-12/SDH的STM - 4 Mbps的多模式光收發(fā)器）
文件頁數(shù)： 4/16頁
文件大?。?/td> 102K
代理商： HFBR-5207
4
Applications Information
Typical BER Performance of
Receiver versus Input Optical
Power Level
The HFBR-5207 transceiver can
be operated at Bit-Error-Ratio
conditions other than the required
BER = 1 x 10
-10
of the 622 MBd
ATM Forum 622.08 Mbps Phys-
ical Layer Standard. The typical
trade-off of BER versus Relative
Input Optical Power is shown
in Figure 2. The Relative Input
Optical Power in dB is referenced
to the Input Optical Power para-
meter value in the Receiver Optical
Characteristics table. For better
BER condition than 1 x 10
-10
,
more input signal is needed
(+ dB). For example, to operate
the HFBR-5207 at a BER of
1 x 10
-12
, the receiver will require
an input signal approximately
0.6 dB higher than the -26 dBm
level required for 1 x 10
-10
operation, i.e. -25.4 dBm.
Recommended Circuit
Schematic
When designing the HFBR-5207
circuit interface, there are a few
fundamental guidelines to follow.
For example, in the Recommended
Circuit Schematic, Figure 3, the
differential data lines should be
treated as 50 Ohm Microstrip or
stripline transmission lines. This
will help to minimize the parasitic
inductance and capacitance effects.
Proper termination of the differ-
ential data and clock signals will
prevent reflections and ringing
which would compromise the sig-
nal fidelity and generate unwanted
electrical noise. Locate termination
at the received signal end of the
transmission line. The length of
these lines should be kept short
and of equal length to prevent
pulse-width distortion and data-
to-clock timing skew from occur-
ring. For the high-speed signal
Figure 2. Relative Input Optical Power – dBm avg.
lines, differential signals should
be used, not single-ended signals.
These differential signals need to
be loaded symmetrically to
prevent unbalanced currents from
flowing which will cause distor-
tion in the signal.
Maintain a solid, low inductance
ground plane for returning signal
currents to the power supply.
Multi-layer plane printed circuit
board is best for distribution of
V
CC
, returning ground currents,
forming transmission lines and
shielding. Also, it is important to
suppress noise from influencing
the fiber-optic transceiver per-
formance, especially the receiver
and the clock recovery circuits.
Proper power supply filtering of
V
CC
for this transceiver is accom-
plished by using the recom-
mended, separate filter circuits
shown in the Recommended
Circuit Schematic figure for the
transmitter and receiver sections.
These filter circuits suppress V
CC
noise of 50 mV peak-to-peak or
less over a broad frequency
range. This prevents receiver
sensitivity degradation as well as
false-lock or loss-of-lock in the
clock recovery circuitry due to
V
CC
noise. It is recommended that
surface-mount components be
used. Use tantalum capacitors for
the 10
μ
F capacitors and mono-
lithic, ceramic bypass capacitors
for the 0.1
μ
F capacitors. Also,
it is recommended that a surface-
mount coil inductor of 1
μ
H be
used. Ferrite beads can be used
to replace the coil inductors
when using quieter V
CC
supplies,
but a coil inductor is recom-
mended over a ferrite bead. Coils
with a low, series dc resistance
(< 0.7 Ohms) and high, self-
resonating frequency are recom-
mended. All power supply
components need to be placed
physically next to the V
CC
pins of
the receiver and transmitter. Use a
good, uniform ground plane with a
minimum number of holes to
provide a low-inductance ground
current return path for the power
supply currents.
In addition to these recommenda-
tions, Hewlett-Packard’s Applica-
tion Engineering staff is available
for consulting on best layout
practices with various vendors
mux/demux, clock generator and
clock recovery circuits. HP has
participated in several reference
design studies and is prepared to
share the findings of these studies
with interested customers. Contact
your local HP sales representative
to arrange for this service.
B
-5
3
10
-2
RELATIVE INPUT OPTICAL POWER – dBm avg.
-3
1
-2
0
10
-4
10
-6
10
-7
10
-8
10
-9
10
10
10
10
10
-10
10
-5
10
-3
-4
-1
2
LINEAR EXTRAPOLATION OF
10
THROUGH 10
DATA
ACTUAL DATA
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