Broadcom AFCT-739SMZ

The Avago AFCT-739SMZ transceiver is part of a family of SFP+ products. This transceiver utilizes Avago’s 1310nm DFB and PIN Detector technology to provide an IEEE 10Gb Ethernet design supporting the 10GBASE-LR standard. The AFCT-739SMZ transceiver is designed to enable 10Gb Ethernet equipment designs with very high port density based on the new electrical and mechanical specification enhancements to the well known SFP specifications developed by the SFF Committee. These specifications are referred to as SFP+ to recognize these enhancements to previous SFP specifications used for lower speed products.

The AFCT-739SMZ transceiver package is compatible with the SFF 8432 Improved Pluggable Formfactor housing specification for the SFP+. It can be installed in any INF-8074 or SFF-8431/2 Small Form Pluggable (SFP) port regardless of host equipment operating status. The AFCT-739SMZ 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).

The two-wire interface protocol and signaling detail are based on SFF-8431. Conventional EEPROM memory, bytes 0 - 255 at memory address 0xA0, is organized in compliance with SFF-8431. New digital diagnostic information, bytes 0 - 255 at memory address 0xA2, is compliant to SFF-8472. The new diagnostic information provides the opportunity for Predictive Failure Identification, Compliance Prediction, Fault Isolation and Component Monitoring.

The AFCT-739SMZ 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 degradation and predicting failure: average laser bias current (Tx_Bias) and average laser optical power (Tx_Power).

Compliance prediction is the ability to determine if an optical transceiver is operating within its operating and environmental requirements. AFCT-739SMZ 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.

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-739SMZ real-time monitors of Tx_Bias, Tx_Power, Vcc, Temperature and 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.

Component evaluation is a more casual use of the AFCT-739SMZ 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.

• Avago 1310 nm DFB source and Transmitter Optical Subassembly technology
• Avago PIN detector and Receiver Optical Subassembly technology
• Typical power dissipation 850mW
• Full digital diagnostic management interface
• Avago SFP+ package design enables equipment EMI performance in high port density applications with margin to Class B limits