參數(shù)資料
型號(hào)： HFCT-6001D
英文描述： 622 Mb/s Single Mode Fiber Transceiver for ATM, SONET OC-12/SDH STM-4(應(yīng)用于ATM, SONET OC-12/SDH STM-4的622 Mb/s單模式光收發(fā)器)
中文描述： 622 Mb / s的對(duì)ATM，SONET的OC-12/SDH的STM - 4單模光纖收發(fā)器（應(yīng)用于自動(dòng)取款機(jī)，SONET的OC-12/SDH的STM - 4的622 Mb / s的單模式光收發(fā)器）
文件頁(yè)數(shù)： 3/12頁(yè)
文件大?。?/td> 177K
代理商： HFCT-6001D
3
Receiver Signal Detect
As the input optical power is
decreased, Signal Detect will
switch from high to low (de-
assert point) at a point between
3 dB below minimum guaranteed
sensitivity and the no light input
level. As the input optical power
is increased from very low levels,
Signal Detect will switch back
from low to high (assert point).
The assert level will be at least
0.5 dB higher than the de-assert
level. This single-ended low-
power PECL output is designed
to drive a standard PECL input
using a 10 k
load instead of the
normal 50
PECL load.
Reference Clock
In applications where the
receiver recovered clock
frequency is not allowed to drift
upon loss of input optical signal,
the HFCT-6001 has the ability to
generate a local clock output by
multiplying an optional, external
19.44 MHz reference clock up to
the OC-12/STM4 (622.08 MHz)
rate. This feature is possible
because the clock recovery
system consists of two loops: a
data loop which locks onto the
incoming optical data stream,
and a second reference loop
which locks onto the optional
external reference clock.
This optional feature is initiated
by applying a Lock-to-Reference
logic signal to pin 2 (Lck Ref-)
which switches the loop to the
external reference clock and
disables the received data
outputs. Pin 2 (Lck Ref-) can be
driven from the Signal Detect pin
15 (SD) output or from other
logic further upstream in the
ATM interface which may be
monitoring the quality of the
received data stream.
Other Members of HP
622 Mb/s Product Family
HFBR-5207 1300 nm LED-
based transceiver in 2 x 9
package for 500 m links with
MMF cables
HFCT-5208 1300 nm laser
based 1 x 9 SC receptacle
transceiver for 15 km links
with SMF cables (without
CDR)
HFBR-5208 1300 nm LED-
based 1 x 9 SC receptacle
transceiver for 500 m links
with MMF cables (drop in
replacement for HFCT-5208)
XMT5370-622 1300 nm laser-
based transmitter in pigtailed
package for 2 km and 15 km
links with SMF cables
XMT5170-622 1300 nm laser-
based transmitter in pigtailed
package for 40 km links with
SMF cables
RGR1622 receiver with
integral clock and data
recovery in pigtailed packages
for 2 km, 15 km and 40 km
HFCT-6002 1300 nm laser-
based 2 x 9 SC receptacle
transceiver for 40 km links
with SMF cables (with CDR).
Applications Information
Typical BER Performance of
Receiver versus Input Optical
Power Level
The HFCT-6001 transceiver can
be operated at Bit-Error-Rate
conditions other than the required
BER = 1 x 10
-10
of the ATM Forum
622.08 Mb/s Physical Layer
Standard. The typical trade-off of
BER versus Relative Input Optical
Power is shown in Figure 3. The
Relative Input Optical Power in dB
is referenced to the Input Optical
Power parameter value in the
Receiver Optical Characteristics
table. For better BER condition
than 1 x 10
-10
, more input signal
is needed (+dB).
Recommended Circuit
Schematic
In order to insure proper
functionality of the HFCT-6001 a
recommended circuit is provided
in Figure 4. When designing the
circuit interface, there are a few
fundamental guidelines to follow.
For example, in the
Recommended Circuit Schematic
figure the differential data lines
should be treated as 50
Microstrip or stripline
transmission lines. This will help
to minimize the parasitic
inductance and capacitance
effects. Proper termination of the
differential data and clock signals
will prevent reflections and
ringing which would compromise
the signal 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 occurring. For the high
speed signal lines, differential
signals should be used, not
single-ended signals, and these
differential signals need to be
loaded symmetrically to prevent
unbalanced currents from
flowing which will cause
distortion in the signal.
10
-2
10
-3
10
-4
10
-5
10
-6
10
-7
10
-8
10
-9
10
-10
10
-11
10
-12
10
-13
10
-14
10
-15
-5
LINEAR EXTRAPOLATION
OF 10
-4
THROUGH 10
-7
DATA POINTS
ACTUAL DATA
POINTS
RELATIVE INPUT OPTICAL POWER - dBm Avg.
B
-4
-3
-2
-1
0
1
2
3
Figure 3. Relative Input Optical Power
- dBm Average.
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