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AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r
9/26/02 Revision D Page 24
Real Time Diagnostic Registers
TABLE 3.17: A/D Values and Status Bits (2 Wire Address A2h)
Byte Bit Name Description
Converted analog values. Calibrated 16 bit data.
96 All Temperature MSB Internally measured module temperature.
97 All Temperature LSB
98 All Vcc MSB Internally measured supply voltage in transceiver.
99 All Vcc LSB
100 All TX Bias MSB Internally measured TX Bias Current.
101 All TX Bias LSB
102 All TX Power MSB Measured TX output power.
103 All TX Power LSB
104 All RX Power MSB Measured RX input power.
105 All RX Power LSB
106 All Reserved MSB Reserved for 1
st
future definition of digitized analog input
107 All Reserved LSB Reserved for 1
st
future definition of digitized analog input
108 All Reserved MSB Reserved for 2
nd
future definition of digitized analog input
109 All Reserved LSB Reserved for 2
nd
future definition of digitized analog input
Optional Status/Control Bits
110 7 TX Disable State Digital state of the TX Disable Input Pin. Updated within
100msec of change on pin. This function is implemented in
all Finisar transceivers with digital diagnostic capability.
110 6 Soft TX Disable Read/write bit that allows software disable of laser. Writing
‘1’ disables laser. Turn on/off time is 100 msec max from
acknowledgement of serial byte transmission. This bit is
“OR”d with the hard TX_DISABLE pin value. Note, per SFP
MSA TX_DISABLE pin is default enabled unless pulled low
by hardware. If Soft TX Disable is not implemented, the
transceiver ignores the value of this bit. Default power up
value is 0. This function is not implemented in Finisar
transceivers
110 5 Reserved
110 4 RX Rate Select State Digital state of the SFP RX Rate Select Input Pin. Updated
within 100msec of change on pin. This function is not
implemented in Finisar transceivers.
110 3 Soft RX Rate Select Read/write bit that allows software RX rate select. Writing ‘1’
selects full bandwidth operation. This bit is “OR’d with the
hard RX RATE_SELECT pin value. Enable/disable time is
100msec max from acknowledgement of serial byte
transmission. Soft RX rate select does not meet the
autonegotiation requirements specified in FC-FS. Default at
power up is zero. If Soft RX Rate Select is not implemented,
the transceiver ignores the value of this bit. This function is
not implemented in Finisar transceivers.
110 2 TX Fault Digital state of the TX Fault Output Pin. Updated within
100msec of change on pin. This function is not implemented
in Finisar transceivers.