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參數資料
| 型號： | TR137FA-0D30S |
| 英文描述： | Optoelectronic |
| 中文描述： | 光電 |
| 文件頁數： | 10/14頁 |
| 文件大?。?/td> | 209K |
| 代理商： | TR137FA-0D30S |
10
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.
Figure 8. Successful recovery from transient safety fault condition
An example of an unsuccessful recovery, where the fault condition was not transient,
is shown in Figure 9.
Figure 9. Unsuccessful recovery from safety fault condition
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