Finisar AN-2030 specifications Alarm and Warning Flags, Los

AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers				F i n i s a r
110	1	LOS	Digital state of the LOS Output Pin. Updated within 100msec
			of change on pin. This function is implemented in all Finisar
			transceivers with digital diagnostic capability.
110	0	Data_Ready_Bar	Indicates transceiver has achieved power up and data is
			ready. Bit remains high until data is ready to be read at
			which time the device sets the bit low. This function is
			implemented in all Finisar transceivers with digital diagnostic
			capability.
111	7-0	Reserved	Reserved.

The data_ready_bar bit is high during module power up and prior to the first valid A/D reading. Once the first valid A/D reading occurs, the bit is set lo w until the device is powered down. The bit must be set low within 1 second of power up.

Alarm and Warning Flags

Bytes 112 – 119 contain a set of non – latched alarm and warning flags. It is recommended that detection of an asserted flag bit be verified by a second read of the flag at least 100msec later. For users who do not wish to set their own threshold values or read the values in locations 0 - 55, the flags alone can be monitored. Two flag types are defined.

1)Alarm flags associated with transceiver temperature, supply voltage, TX bias current, TX output power and received optical power as well as reserved locations for future flags. Alarm flags indicate conditions likely to be associated with an in- operational link and cause for immediate action. Please consult the appropriate Finisar specification sheet for thresholds associated with a particular module.

2)Warning flags associated with transceiver temperature, supply voltage, TX bias current, TX output power and received optical power as well as reserved locations for future flags. Warning flags indicate conditions outside the normally guaranteed bounds but not necessarily causes of immediate link failures. Certain warning flags may also be defined by the manufacturer as end-of-life indicators (such as for higher than expected bias currents in a constant power control loop). Please consult the appropriate Finisar specification sheet for thresholds associated with a particular module.

9/26/02 Revision D Page 25