AFBR-59R5LZ_15 Datasheet, PDF (2/19 Pages) AVAGO TECHNOLOGIES LIMITED – RoHS-Compliant Optical Transceiver

Digital Diagnostic Interface and Serial Identification
The 2-wire serial interface is based on ATMEL AT24C01A
series EEPROM protocol and signaling detail. Conven-
tional 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 Predic-
tive Failure Identification, Compliance Prediction, Fault
Isolation 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 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 redun-
dant link or replace a suspect device, maintaining system
uptime in the process. For applications where ultra-high
system uptime is required, a digital SFF provides a means
to monitor two real-time laser metrics associated with
observing laser degradation and predicting failure: aver-
age 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. AFBR-59R5LZ devices
provide real-time access to transceiver internal supply
voltage and temperature, allowing a host to identify
potential 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
transmission.
Fault Isolation
The fault isolation feature allows a host to quickly pin-
point the location of a link failure, minimizing system
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. AFBR-59R5LZ real-
time monitors of Tx_Bias, Tx_Power, Vcc, Temp and Rx
average power can be used to assess local transceiver
current operating conditions. In addition, status flags Tx
Disable and Rx Signal Detect are mirrored in memory and
available via the two-wire serial interface.
OPTICAL INTERFACE
LIGHT FROM FIBER
RECEIVER
PHOTO-DETECTOR
AMPLIFICATION
& QUANTIZATION
ELECTRICAL INTERFACE
RD+ (RECEIVE DATA)
RD- (RECEIVE DATA)
Rx SIGNAL DETECT
CONTROLLER & MEMORY
LIGHT TO FIBER
TRANSMITTER
VCSEL
Figure 1. Transceiver Functional Diagram
LASER
DRIVER &
SAFETY
CIRCUITRY
MOD-DEF2 (SDA)
MOD-DEF1 (SCL)
MOD-DEF0
TX_DISABLE
TD+ (TRANSMIT DATA)
TD- (TRANSMIT DATA)
TX_FAULT
2