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HFBR-5103P

100 Mbps ATM, and Fast Ethernet Transceivers in Low Cost 1x9 Package Style

HP => Agilent Technologies 

Application Information

The Applications Engineering

group in the Agilent Optical

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.

1 dB of aging over normal

commercial equipment mission

life periods. Contact your Agilent

sales representative for additional

details.

Figure 4 was generated with an

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.

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).

When used in FDDI and ATM 100

Mbps 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.

The transceivers may be used for

other applications at signaling

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.

14

12

HFBR-5103, 62.5/125 µm

10

8

Agilent LED technology has

produced 1300 nm LED devices

with lower aging characteristics

than normally associated with

these technologies in the industry.

The industry convention is 1.5 dB

aging for 1300 nm LEDs. The

Agilent Technologies 1300 nm

LEDs will experience less than

6

6

HFBR-5103,

50/125 µm

4

2

0

0.15 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

FIBER OPTIC CABLE LENGTH (km)

Figure 4. Optical Power Budget at BOL versus Fiber Optic

Cable Length.

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