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AFCT-5760ANPZ Datasheet(PDF) 4 Page - AVAGO TECHNOLOGIES LIMITED |
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AFCT-5760ANPZ Datasheet(HTML) 4 Page - AVAGO TECHNOLOGIES LIMITED |
4 / 19 page 4 Figure 3. MSA required power supply filter V CCT 0.1 µF 0.1 µF 10 µF 1 µH 1 µH 0.1 µF 10 µF 3.3 V SFP MODULE V CCR HOST BOARD 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. 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). Functional Data I/O Avago’s AFCT-576xZ transceiver is designed to accept industry standard differential signals. The transceiver pro- vides an AC-coupled, internally terminated data interface. Bias resistors and coupling capacitors have been included within the module to reduce the number of components required on the customer’s board. Figure 2 illustrates the recommended interface circuit. Digital Diagnostic Interface and Serial Identification The AFCT-576xZ family complies with the SFF-8074i spec- ification, which defines the module’s serial identification protocol to use the 2-wire serial CMOS EEPROM protocol of the ATMEL AT24C01A or similar. Standard SFP EEPROM bytes 0-255 are addressed per SFF-8074i at memory ad- dress 0xA0 (A0h). 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 enhancement adds digital diagnostic monitoring to stan- dard SFP functionality, enabling failure prediction, fault isolation, and component monitoring capabilities. 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). 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). 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. Predictive Failure Identification The diagnostic information allows the host system to identify potential link problems. Once identified, a fail- over technique can be used to isolate and replace sus- pect devices before system uptime is impacted. Compliance Prediction The real-time diagnostic parameters can be monitored to alert the system when operating limits are exceeded and compliance cannot be ensured. Fault Isolation The diagnostic information can allow the host to pin- point the location of a link problem and accelerate sys- tem servicing and minimize downtime. Component Monitoring As part of the host system monitoring, the real time di- agnostic information can be combined with system level monitoring to ensure system reliability. Application Support 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. |
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