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參數資料
型號: TR857FA-0D50M
英文描述: Optoelectronic
中文描述: 光電
文件頁數: 8/19頁
文件大小: 201K
代理商: TR857FA-0D50M
8
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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