Installation
Compliance Prediction
The AFBR-57R5AEZ can be installed in any SFF-8074i Compliance prediction is the ability to determine if an
compliant Small Form Pluggable (SFP) port regardless of optical transceiver is operating within its operating and
host equipment operating status. The AFBR-57R5AEZ is environmental requirements. AFBR-57R5AEZ devices
hot-pluggable, allowing the module to be installed while provide real-time access to transceiver internal supply
the host system is operating and on-line. Upon insertion, voltage and temperature, allowing a host to identify po-
the transceiver housing makes initial contact with the tential component compliance issues. Received optical
host board SFP cage, mitigating potential damage due power is also available to assess compliance of a cable
to Electro-Static Discharge (ESD).
plant and remote transmitter. When operating out of re-
quirements, the link cannot guarantee error free trans-
mission.
Digital Diagnostic Interface and Serial Identification
The 2-wire serial interface is based on ATMEL AT24C01A
series EEPROM protocol and signaling detail. Conven-
Fault Isolation
tional EEPROM memory, bytes 0-255 at memory address The fault isolation feature allows a host to quickly pin-
0xA0, is organized in compliance with SFF-8074i. New point the location of a link failure, minimizing downtime.
digital diagnostic information, bytes 0-255 at memory For optical links, the ability to identify a fault at a local
address 0xA2, is compliant to SFF-8472. The new diag- device, remote device or cable plant is crucial to speed-
nostic information provides the opportunity for Predic- ing service of an installation. AFBR-57R5AEZ real-time
tive Failure Identification, Compliance Prediction, Fault monitors of Tx_Bias, Tx_Power, Vcc, Temperature and
Isolation and Component Monitoring.
Rx_Power can be used to assess local transceiver current
operating conditions. In addition, status flags Tx_Disable
and Rx Loss of Signal (LOS) are mirrored in memory and
available via the two-wire serial interface.
The I2C accessible memory page address 0xB0 is used
internally by SFP for the test and diagnostic purposes
and it is reserved.
Component Monitoring
Predictive Failure Identification
Component evaluation is a more casual use of the AF-
BR-57R5AEZ 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.
The AFBR-57R5AEZ 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
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 degrada-
tion and predicting failure: average laser bias current
(Tx_Bias) and average laser optical power (Tx_Power).
2
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