HFBR-5104 Agilent(Hewlett-Packard), HFBR-5104 Datasheet - Page 21

• Manufacturer Part Number: HFBR-5104
• Description: FDDI/ 100 Mbps ATM/ and Fast Ethernet Transceivers in Low Cost 1x9 Package Style
• Manufacturer: Agilent(Hewlett-Packard)

11. These optical power values are
12. The same comments of note 11
13. The Extinction Ratio is a measure of
146
• The Beginning of Life (BOL) to
• Over the specified operating
• With HALT Line State, (12.5 MHz
• At the end of one meter of noted
measured with the following
conditions:
converted to a peak power value by
adding 3 dB. Higher output optical
power transmitters are available on
special request.
apply except that industry conven-
tion for short wavelength LED (800
nm) BOL to EOL aging is 3 dB. This
value for Output Optical Power will
provide a minimum of a 6 dB optical
power budget at the EOL, which
will provide at least 500 meter link
lengths with margin left over for
overcoming normal passive losses,
such as in line connectors, in the
cable plant. The actual degradation
observed in normal commercial
environments will be considerably
less than this amount with Hewlett-
Packard’s 800 nm LED products.
Please consult with your local HP
sales representative for further
details.
the modulation depth of the optical
signal. The data “0” output optical
power is compared to the data “1”
peak output optical power and
expressed as a percentage. With the
transmitter driven by a HALT Line
State (12.5 MHz square-wave)
signal, the average optical power is
measured. The data “1” peak power
is then calculated by adding 3 dB to
the measured average optical power.
The data “0” output optical power is
found by measuring the optical
power when the transmitter is
driven by a logic “0” input. The
extinction ratio is the ratio of the
optical power at the “0” level
compared to the optical power at the
“1” level expressed as a percentage
The average power value can be
the End of Life (EOL) optical
power degradation is typically 1.5
dB per the industry convention for
long wavelength LEDs. The actual
degradation observed in Hewlett-
Packard’s 1300 nm LED products
is < 1 dB, as specified in this data
sheet.
voltage and temperature ranges.
square-wave), input signal.
optical fiber with cladding modes
removed.
14. The transmitter provides
15. This parameter complies with the
16. This parameter complies with the
16a. The optical rise and fall times are
17. Duty Cycle Distortion contributed
18. Data Dependent Jitter contributed
19. Random Jitter contributed by the
20. This specification is intended to
or in decibels.
compliance with the need for
Transmit_Disable commands from
the FDDI SMT layer by providing
an Output Optical Power level of
< -45 dBm average in response to a
logic “0” input. This specification
applies to either 62.5/125 m or
50/125 m fiber cables.
FDDI PMD requirements for the
tradeoffs between center wave-
length, spectral width, and rise/fall
times shown in Figure 9.
optical pulse envelope from the
FDDI PMD shown in Figure 10. The
optical rise and fall times are
measured from 10% to 90% when
the transmitter is driven by the
FDDI HALT Line State (12.5 MHz
square-wave) input signal.
measured from 10% to 90% when
the transmitter is driven by the
FDDI HALT Line State (12.5 MHz
square-wave) input signal.
by the transmitter is measured at a
50% threshold using an IDLE Line
State, 125 MBd (62.5 MHz square-
wave), input signal. See Application
Information - Transceiver Jitter
Performance Section of this data
sheet for further details.
by the transmitter is specified with
the FDDI test pattern described in
FDDI PMD Annex A.5. See Applica-
tion Information - Transceiver Jitter
Performance Section of this data
sheet for further details.
transmitter is specified with an
IDLE Line State, 125 MBd (62.5
MHz square-wave), input signal.
See Application Information -
Transceiver Jitter Performance
Section of this data sheet for further
details.
indicate the performance of the
receiver section of the transceiver
when Input Optical Power signal
characteristics are present per the
following definitions. The Input
Optical Power dynamic range from
the minimum level (with a window
time-width) to the maximum level is
the range over which the receiver is
guaranteed to provide output data
with a Bit Error Ratio (BER) better
than or equal to 2.5 x 10
• At the Beginning of Life (BOL)
• Over the specified operating
• Input symbol pattern is the FDDI
• Receiver data window time-width
To test a receiver with the worst
case FDDI PMD Active Input jitter
condition requires exacting control
over DCD, DDJ and RJ jitter compo-
nents that is difficult to implement
with production test equipment. The
receiver can be equivalently tested
to the worst case FDDI PMD input
jitter conditions and meet the
minimum output data window time-
width of 2.13 ns. This is accom-
plished by using a nearly ideal input
optical signal (no DCD, insignificant
DDJ and RJ) and measuring for a
wider window time-width of 4.6 ns.
This is possible due to the cumula-
tive effect of jitter components
through their superposition (DCD
and DDJ are directly additive and
RJ components are rms additive).
Specifically, when a nearly ideal
input optical test signal is used and
the maximum receiver peak-to-peak
jitter contributions of DCD (0.4 ns),
DDJ (1.0 ns), and RJ (2.14 ns) exist,
the minimum window time-width
becomes 8.0 ns -0.4 ns - 1.0 ns - 2.14
ns = 4.46 ns, or conservatively
4.6 ns. This wider window time-
width of 4.6 ns guarantees the FDDI
PMD Annex E minimum window
time-width of 2.13 ns under worst
case input jitter conditions to the
Hewlett-Packard receiver.
• Transmitter operating with an
temperature and voltage ranges
test pattern defined in FDDI PMD
Annex A.5 with 4B/5B NRZI
encoded data that contains a duty
cycle base-line wander effect of
50 kHz. This sequence causes a
near worst case condition for
inter-symbol interference.
is 2.13 ns or greater and centered
at mid-symbol. This worst case
window time-width is the
minimum allowed eye-opening
presented to the FDDI PHY
PM._Data indication input (PHY
input) per the example in FDDI
PMD Annex E. This minimum
window time-width of 2.13 ns is
based upon the worst case FDDI
PMD Active Input Interface
optical conditions for peak-to-peak
DCD (1.0 ns), DDJ (1.2 ns) and RJ
(0.76 ns) presented to the
receiver.
-10
.