AFBR-709DMZ datasheet(2/22 Pages) AVAGO

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Installation

The AFBR-709DMZ transceiver package is compliant

with the SFF 8432 Improved Pluggable Formfactor hous-

ing specification for the SFP+. It can be installed in any

INF-8074 or SFF-8431/2 compliant Small Form Pluggable

(SFP) port regardless of host equipment operating status

The AFBR-709DMZ is hot-pluggable, allowing the mod-

ule to be installed while the host system is operating and

on-line. Upon insertion, the transceiver housing makes

initial contact with the host board SFP cage, mitigating

potential damage due to Electro-Static Discharge (ESD).

By selecting TX rate select to 1.25 Gbps operation, the

module TX performance complies with the extinction

ratio and output power level in 1000BASE-SX specifica-

tions.

Likewise RX performance complies with the sensitivity

performance in the 1000BASE-SX specifications by se-

lecting RX rate select to 1.25 Gbps operation.

The rate select can be done through either the hardware

pins or the software access to the A2h page of EEPROM

map. The user can refer to the Appendix for details of

rate select.

Digital Diagnostic Interface and Serial Identification

The two-wire interface protocol and signaling detail are

based on SFF-8431. Conventional EEPROM memory,

bytes 0-255 at memory address 0xA0, is organized in

compliance with SFF-8431. New digital diagnostic in-

formation, bytes 0-255 at memory address 0xA2, is

compliant to SFF-8472. The new diagnostic information

provides the opportunity for Predictive Failure Identifi-

cation, Compliance Prediction, Fault Isolation and Com-

ponent Monitoring.

Predictive Failure Identification

The AFBR-709DMZ predictive failure feature allows a

host to identify potential link problems before system

performance is impacted. Prior identification of link

problems enables a host to service an application via

“fail over” to a redundant link or replace a suspect de-

vice, maintaining system uptime in the process. For ap-

plications where ultra-high system uptime is required, a

digital SFP provides a means to monitor two real-time

laser metrics associated with laser degradation and pre-

dicting failure: average laser bias current (Tx_Bias) and

average laser optical power (Tx_Power).

Description, continued

Compliance Prediction

Compliance prediction is the ability to determine if an

optical transceiver is operating within its operating and

environmental requirements. AFBR-709DMZ devices

provide real-time access to transceiver internal supply

voltage and temperature, allowing a host to identify po-

tential component compliance issues. Received optical

power is also available to assess compliance of a cable

plant and remote transmitter. When operating out of

requirements, the link cannot guarantee error free trans-

mission.

Fault Isolation

The fault isolation feature allows a host to quickly pin-

point the location of a link failure, minimizing downtime.

For optical links, the ability to identify a fault at a local

device, remote device or cable plant is crucial to speed-

ing service of an installation. AFBR-709DMZ real-time

monitors of Tx_Bias, Tx_Power, Vcc, Temperature and

Rx_Power can be used to assess local transceiver current

operating conditions. In addition, status flags TX_DIS-

ABLE and Rx Loss of Signal (LOS) are mirrored in memory

and available via the two-wire serial interface.

Component Monitoring

Component evaluation is a more casual use of the

AFBR-709DMZ real-time monitors of Tx_Bias, Tx_Power,

Vcc, Temperature and Rx_Power. Potential uses are as

debugging aids for system installation and design, and

transceiver parametric evaluation for factory or field

qualification. For example, temperature per module can

be observed in high density applications to facilitate

thermal evaluation of blades, PCI cards and systems.

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