Using the 2-wire serial interface, the AFCT-5765Z pro-
vides real time access to transceiver internal supply volt-
age and temperature, transmitter output power, laser
bias current and receiver average input power, allowing
a host to predict system compliance issues. These five
parameters are internally calibrated, per the MSA. New
digital diagnostic information is accessed per SFF-8472
using EEPROM bytes 0-255 at memory address 0xA2
(A2h).
Receiver Section
The receiver section for the AFCT-576xZ contains an
InGaAs/InP photo detector and a preamplifier mounted
in an optical subassembly. This optical subassembly is
coupled to a post amplifier/decision circuit on a circuit
board. The design of the optical subassembly provides
better than 12 dB Optical Return Loss (ORL).
Connection to the receiver is provided via a LC optical
connector.
The digital diagnostic interface also adds the ability to
disable the transmitter (TX_DISABLE), monitor for Trans-
mitter Faults (TX_FAULT) and monitor for Receiver Loss
of Signal (RX_LOS).
RX_LOS
The receiver section contains a loss of signal (RX_LOS)
circuit to indicate when the optical input signal power
is insufficient for SONET/SDH compliance. A high signal
indicates loss of modulated signal, indicating link failure
such as a broken fiber or a failed transmitter. RX_LOS can
be also be monitored via the two-wire serial (address A2,
byte 110, bit 1).
Contents of the MSA-compliant serial ID memory are
shown in Tables 3 to 7. The SFF-8074i and SFF-8472
specifications are available from the SFF Committee at
http://www.sffcommittee.org.
The I2C accessible memory page address 0xB0 is used
internally by SFP for the test and diagnostic purposes
and it is reserved.
Functional Data I/O
Avago’s AFCT-576xZ transceiver is designed to accept
industry standard differential signals. The transceiver pro-
Predictive Failure Identification
vides an AC-coupled, internally terminated data interface. The diagnostic information allows the host system to
Bias resistors and coupling capacitors have been included
identify potential link problems. Once identified, a fail-
within the module to reduce the number of components over technique can be used to isolate and replace sus-
required on the customer’s board. Figure 2 illustrates the pect devices before system uptime is impacted.
recommended interface circuit.
Compliance Prediction
Digital Diagnostic Interface and Serial Identification
The real-time diagnostic parameters can be monitored
The AFCT-576xZ family complies with the SFF-8074i spec-
to alert the system when operating limits are exceeded
ification, which defines the module’s serial identification and compliance cannot be ensured.
protocol to use the 2-wire serial CMOS EEPROM protocol
Fault Isolation
of the ATMEL AT24C01A or similar. Standard SFP EEPROM
bytes 0-255 are addressed per SFF-8074i at memory ad-
dress 0xA0 (A0h).
The diagnostic information can allow the host to pin-
point the location of a link problem and accelerate sys-
tem servicing and minimize downtime.
As an enhancement to the conventional SFP interface
defined in SFF-8074i, the AFCT-5765Z is also compliant
to SFF-8472 (the digital diagnostic interface for SFP). This
Component Monitoring
enhancement adds digital diagnostic monitoring to stan- As part of the host system monitoring, the real time di-
dard SFP functionality, enabling failure prediction, fault agnostic information can be combined with system level
isolation, and component monitoring capabilities.
monitoring to ensure system reliability.
Application Support
1 µH
An Evaluation Kit and Reference Designs are available to
assist in evaluation of the AFCT-576xZ SFPs. Please con-
tact your local Field Sales representative for availability
and ordering details.
VCC
T
0.1 µF
0.1 µF
1 µH
VCCR
3.3 V
10 µF
0.1 µF
10 µF
SFP MODULE
HOST BOARD
Figure 3. MSA required power supply filter
4
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