HFBR-5803A HP [Agilent(Hewlett-Packard)], HFBR-5803A Datasheet - Page 5

• Manufacturer Part Number: HFBR-5803A
• Description: FDDI 100 Mb/s ATM and Fast Ethernet Transceivers in Low Cost 1 x 9 Package Style
• Manufacturer: HP [Agilent(Hewlett-Packard)]

Application Information
The Applications Engineering
group in the Agilent Fiber Optics
Communication Division is
available to assist you with the
technical understanding and
design trade-offs associated with
these transceivers. You can
contact them through your
Agilent sales representative.
The following information is
provided to answer some of the
most common questions about
the use of these parts.
Transceiver Optical Power Budget
versus Link Length
Optical Power Budget (OPB) is
the available optical power for a
fiber optic link to accommodate
fiber cable losses plus losses due
to in-line connectors, splices,
optical switches, and to provide
margin for link aging and
unplanned losses due to cable
plant reconfiguration or repair.
Figure 4 illustrates the predicted
OPB associated with the
transceiver series specified in
this data sheet at the Beginning
of Life (BOL). These curves
represent the attenuation and
chromatic plus modal dispersion
losses associated with the 62.5/
125 µm and 50/125 µm fiber
cables only. The area under the
curves represents the remaining
OPB at any link length, which is
available for overcoming non-
fiber cable related losses.
Agilent LED technology has
produced 1300 nm LED devices
with lower aging characteristics
than normally associated with
these technologies in the
industry. The industry conven-
tion is 1.5 dB aging for 1300 nm
LEDs. The Agilent 1300 nm
LEDs will experience less than
1 dB of aging over normal com-
mercial equipment mission life
periods. Contact your Agilent
sales representative for
additional details.
5
Figure 4 was generated with a
Agilent fiber optic link model
containing the current industry
conventions for fiber cable
specifications and the FDDI
PMD and LCF-PMD optical
parameters. These parameters
are reflected in the guaranteed
performance of the transceiver
specifications in this data sheet.
This same model has been used
extensively in the ANSI and
IEEE committees, including the
ANSI X3T9.5 committee, to
establish the optical performance
requirements for various fiber
optic interface standards. The
cable parameters used come
from the ISO/IEC JTC1/SC 25/
WG3 Generic Cabling for
Customer Premises per
DIS 11801 document and the
EIA/TIA-568-A Commercial
Building Telecommunications
Cabling Standard per SP-2840.
Figure 4. Optical Power Budget at BOL versus
Fiber Optic Cable Length.
Transceiver Signaling Operating
Rate Range and BER Performance
For purposes of definition, the
symbol (Baud) rate, also called
signaling rate, is the reciprocal
of the shortest symbol time. Data
rate (bits/sec) is the symbol rate
divided by the encoding factor
used to encode the data
(symbols/bit).
12
10
8
6
4
2
0
0.3
FIBER OPTIC CABLE LENGTH (km)
0.5
HFBR-5803, 62.5/125 µm
1.0
HFBR-5803
50/125 µm
1.5
2.0
2.5
When used in Fast Ethernet,
FDDI and ATM 100 Mb/s
applications the performance of
the 1300 nm transceivers is
guaranteed over the signaling
rate of 10 MBd to
125 MBd to the full conditions
listed in individual product
specification tables.
Figure 5. Transceiver Relative Optical Power
Budget at Constant BER vs. Signaling Rate.
The transceivers may be used
for other applications at signal-
ing rates outside of the 10 MBd
to 125 MBd range with some
penalty in the link optical power
budget primarily caused by a
reduction of receiver sensitivity.
Figure 5 gives an indication of
the typical performance of these
1300 nm products at different
rates.
These transceivers can also be
used for applications which
require different Bit Error Rate
(BER) performance. Figure 6
illustrates the typical trade-off
between link BER and the
receivers input optical power
level.
2.5
2.0
1.5
1.0
0.5
0.5
0
CONDITIONS:
1. PRBS 2
2. DATA SAMPLED AT CENTER OF DATA SYMBOL.
3. BER = 10
4. T
5. V
6. INPUT OPTICAL RISE/FALL TIMES = 1.0/2.1 ns.
0
A
CC
25
= +25° C
= 3.3 V to 5 V dc
7
-1
50
-6
SIGNAL RATE (MBd)
75
100
125
150
175
200