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參數資料

Figure 6. SFP Tx Disable timing during normal operation

SFP transceiver fault detection and presentation

Figure 7. Detection of transmitter safety fault condition

SFP transceiver fault recovery

The detection of a safety-related transmitter fault condition presented by TX_FAULT shall be latched.

The following protocol may be used to reset the latch in case the transmitter fault condition is transient.

To reset the fault condition and associated detection circuitry, TX_DISABLE shall be asserted for a

minimum of t_reset. TX_DISABLE shall then be negated. In less than the maximum value of t_init the

optical transmitter will correctly reinitialize the laser circuits, negate TX_FAULT, and begin normal

operation if the fault condition is no longer present. If a fault condition is detected during the

reinitialization, TX_FAULT shall again be asserted, the fault condition again latched, and the optical

transmitter circuitry will again be disabled until the next time a reset protocol is attempted. The

manufacturer of the SFP shall ensure that the optical power emitted from an open connector or fiber is

compliant with IEC825-1 and CDRH during all reset attempts, during normal operation or upon the

occurrence of reasonable single fault conditions. The SFP transceiver may require internal protective

circuitry to prevent the frequent assertion of the TX_DISABLE signal from generating frequent pulses

of energy that violate the safety requirements. The timing for successful recovery from a transient

safety fault condition is shown in Figure 8.

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