050_340 Datasheet, PDF (8/14 Pages) Glenair, Inc. – PRINTED CIRCUIT BOARD (PCB) MOUNT

050-340 Product Brief
PCB Mount Bi-Directional 1310/1550 Single Fiber
Transceiver, 125 Mbps – 1.25 Gbps, SMF, 3.3V
monitor for Transmitter Faults (TX_FAULT), and monitor for Receiver Loss of Signal (RX_LOS). The diagnostic
information provides the opportunity for Predictive Failure Identification, Compliance Prediction, Fault Isolation and
Component Monitoring.
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 redundant link or replace a
suspect device, maintaining system uptime in the process. For applications where ultra-high system uptime is required,
the PCB mount Transceiver 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
Compliance prediction is the ability to determine if an optical transceiver is operating within its operating and
environmental requirements. The PCB mount Transceiver 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 fiber 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 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. PCB mount Transceiver 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 flag Rx Loss of Signal (LOS) is mirrored
in memory and available via the two-wire serial interface.
Component Monitoring
Component evaluation is another use of the PCB mount Transceiver 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 systems that incorporate this PCB mount transceiver
Required Host Board Components
A power supply noise rejection filter as describe in SFP MSA is required on the host PCB to meet data sheet
performance. This is filter incorporates an inductor which should be rated to 400 mADC and 1 Ω series resistance or
better. It should not be replaced with a ferrite. The required filter is illustrated in Figure 4. Also, the host PCB for the PCB
mount transceiver requires 4.7 K to 10 KΩ pull-up resistors for TX_FAULT, LOS, SCA and SDL lines.
©2015 Glenair, Inc.
GLENAIR, INC.
www.glenair.com
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