AFCT-57R5ATPZ datasheet(2/20 Pages) BOARDCOM

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Installation

The AFCT-57R5ATPZ can be installed in any SFF-8074i

compliant Small Form Pluggable (SFP) port regardless of

host equipment operating status. The AFCT-57R5ATPZ is

hot-pluggable, allowing the module 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).

Digital Diagnostic Interface and Serial Identification

The 2-wire serial interface is based on ATMEL AT24C01A

series EEPROM protocol and signaling detail. Conventional

SFP EEPROM memory, bytes 0-255 at memory address

0xA0, is organized in compliance with SFF-8074i. New

digital diagnostic information, bytes 0-255 at memory

address 0xA2, is compliant to SFF-8472. The new diag-

nostic information provides the opportunity for Predictive

Failure Identification, Compliance Prediction, Fault Isola-

tion and Component Monitoring.

The I2C accessible memory page address 0xB0 is used

internally by SFP for the test and diagnostic purposes

and it is reserved.

Predictive Failure Identification

The AFCT-57R5ATPZ predictive failure feature allows a

host to identify potential link problems before system per-

formance 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 device, maintaining

system uptime in the process. For applications where

ultra-high system uptime is required, a digital SFP provides

a means to monitor two real-time laser metrics associated

with observing laser degradation and predicting failure:

average laser bias current (Tx_Bias) and average laser

optical power (Tx_Power).

Compliance Prediction

Compliance prediction is the ability to determine if an

optical transceiver is operating within its operating and

environmental requirements. AFCT-57R5ATPZ 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 pinpoint

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 speeding service

of an installation. AFCT-57R5ATPZ real-time monitors of

Tx_Bias, Tx_Power, Vcc, Temperature and Rx_Power can be

used to assess local transceiver current operating condi-

tions. In addition, status flags Tx_Disable 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 AFCT-

57R5ATPZ real-time monitors of Tx_Bias, Tx_Power, Vcc,

Temperature and Rx_Power. Potential uses are as debug-

ging aids for system installation and design, and transceiv-

er 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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