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AFBR-5803Z

FDDI, 100 Mb/s ATM, and Fast Ethernet Transceivers in Low-Cost 1 × 9 Package Style

Broadcom Corporation 

AFBR-5803Z/5803TZ/5803AZ/5803ATZ

Data Sheet

Figure 5 Pin Out Diagram

1 = VEE

2 = RD

3 = RD

N/C

Rx

4 = SD

5 = VCC

6 = VCC

7 = TD

8 = TD

9 = V EE

Tx

N/C

TOP VIEW

Application Information

The Applications Engineering group in the Broadcom 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

Broadcom 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 inline connectors, splices, optical switches, and to

provide margin for link aging and unplanned losses due to

cable plant reconfiguration or repair.

Figure 6 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.

Broadcom 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 Broadcom 1300-nm LEDs

will experience less than 1dB of aging over normal commercial

equipment mission life periods. Contact your Broadcom sales

representative for additional details.

Figure 6 was generated with a Broadcom 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/s) is the symbol rate divided by the encoding

factor used to encode the data (symbols/bit).

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.

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 7 gives an

indication of the typical performance of these 1300-nm

products at different rates.

These transceivers can also be used for applications that

require different Bit Error Rate (BER) performance. Figure 8

illustrates the typical trade-off between link BER and the

receivers’ input optical power level.

Broadcom

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