Finisar AN-2030 - Manual (Page 20)

AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers
F i n i s a r
9/26/02 Revision D Page 20
5) Measured received optical power. Received power, RX_PWR, is given in µW by 1
the following equation: 2
Rx_PWR (µW) = Rx_PWR(4) * Rx_PWR
AD
4
(16 bit unsigned integer) + 3
Rx_PWR(3)*Rx_PWR
AD
3
(16 bit unsigned integer) + Rx_PWR(2)*Rx_PWR
AD
2
(16 bit 4
unsigned integer) + Rx_PWR(1) *Rx_PWR
AD
(16 bit unsigned integer) + Rx_PWR(0) 5
The result is in units of 0.1µW yielding a total range of 0 – 6.5mW. See Table 3.15 for 6
locations of Rx_PWR(4-0). Absolute accuracy is dependent upon the exact optical 7
wavelength. For the specified wavelength, accuracy shall be better than ±3dB over 8
specified temperature and voltage. See module specification sheet for range over 9
which accuracy requirement is met. 10
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Alarm and Warning Thresholds 12
Each A/D quantity has a corresponding high alarm, low alarm, high warning and low 13
warning threshold. These factory preset values allow the user to determine when a 14
particular value is outside of “normal” limits. These values vary with different 15
technologies and implementations.
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Table 3.14: Alarm and Warning Thresholds (2-Wire Address A2h) 18
Address # Bytes Name Description
00-01 2 Temp High Alarm MSB at low address
02-03 2 Temp Low Alarm
MSB at low address
04-05 2 Temp High Warning
MSB at low address
06-07 2 Temp Low Warning
MSB at low address
08-09 2 Voltage High Alarm
MSB at low address
10-11 2 Voltage Low Alarm
MSB at low address
12-13 2 Voltage High Warning
MSB at low address
14-15 2 Voltage Low Warning
MSB at low address
16-17 2 Bias High Alarm
MSB at low address
18-19 2 Bias Low Alarm
MSB at low address
20-21 2 Bias High Warning
MSB at low address
22-23 2 Bias Low Warning
MSB at low address
24-25 2 TX Power High Alarm
MSB at low address
26-27 2 TX Power Low Alarm
MSB at low address
28-29 2 TX Power High Warning
MSB at low address
30-31 2 TX Power Low Warning
MSB at low address
32-33 2 RX Power High Alarm
MSB at low address
34-35 2 RX Power Low Alarm
MSB at low address
36-37 2 RX Power High Warning
MSB at low address
38-39 2 RX Power Low Warning
MSB at low address
40-55 16 Reserved Reserved for future monitored quantities
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