Checking TX / RX optical power in Juniper (JunOS)

Checking TX / RX optical power for Juniper Routers

For checking transmission links, it is good to know how to find out the optical power for troubleshooting and making sure the desired or optimal range is meet.

Here is the sample command for checking the TX/RX optical power

show interfaces diagnostics optics <interface-name>

Sample Output for 10GE interface:

darwin@JUNOS-re0> show interfaces diagnostics optics xe-3/0/1
Physical interface: xe-3/0/16
Laser bias current : 41.590 mA
Laser output power : 0.7150 mW / -1.46 dBm
Module temperature : 27 degrees C / 81 degrees F
Module voltage : 3.2990 V
Laser receiver power : 0.7567 mW / -1.21 dBm
Laser bias current high alarm : Off
Laser bias current low alarm : Off
Laser bias current high warning : Off
Laser bias current low warning : Off
Laser output power high alarm : Off
Laser output power low alarm : Off
Laser output power high warning : Off
Laser output power low warning : Off
Module temperature high alarm : Off
Module temperature low alarm : Off
Module temperature high warning : Off
Module temperature low warning : Off
Module voltage high alarm : Off
Module voltage low alarm : Off
Module voltage high warning : Off
Module voltage low warning : Off
Laser rx power high alarm : Off
Laser rx power low alarm : Off
Laser rx power high warning : Off
Laser rx power low warning : Off
Laser bias current high alarm threshold : 85.000 mA
Laser bias current low alarm threshold : 15.000 mA
Laser bias current high warning threshold : 80.000 mA
Laser bias current low warning threshold : 20.000 mA
Laser output power high alarm threshold : 1.5840 mW / 2.00 dBm
Laser output power low alarm threshold : 0.1580 mW / -8.01 dBm
Laser output power high warning threshold : 1.2580 mW / 1.00 dBm
Laser output power low warning threshold : 0.1990 mW / -7.01 dBm
Module temperature high alarm threshold : 88 degrees C / 190 degrees F
Module temperature low alarm threshold : -13 degrees C / 9 degrees F
Module temperature high warning threshold : 85 degrees C / 185 degrees F
Module temperature low warning threshold : -8 degrees C / 18 degrees F
Module voltage high alarm threshold : 3.700 V
Module voltage low alarm threshold : 2.900 V
Module voltage high warning threshold : 3.600 V
Module voltage low warning threshold : 3.000 V
Laser rx power high alarm threshold : 1.7783 mW / 2.50 dBm
Laser rx power low alarm threshold : 0.0100 mW / -20.00 dBm
Laser rx power high warning threshold : 1.5849 mW / 2.00 dBm
Laser rx power low warning threshold : 0.0158 mW / -18.01 dBm

show interfaces diagnostics optics <interface-name> | match <pattern>

Sample Output for 100GE interface (it will have 4, highlighted are current important values)

darwin@JUNOS-re0> show interfaces diagnostics optics et-0/0/0 | match power
Laser output power high alarm threshold : 3.5481 mW / 5.50 dBm
Laser output power low alarm threshold : 0.2344 mW / -6.30 dBm
Laser output power high warning threshold : 2.8184 mW / 4.50 dBm
Laser output power low warning threshold : 0.2951 mW / -5.30 dBm
Laser rx power high alarm threshold : 3.5481 mW / 5.50 dBm
Laser rx power low alarm threshold : 0.0436 mW / -13.61 dBm
Laser rx power high warning threshold : 2.8183 mW / 4.50 dBm
Laser rx power low warning threshold : 0.0871 mW / -10.60 dBm
Laser output power : 1.003 mW / 0.01 dBm
Laser receiver power : 1.282 mW / 1.08 dBm
Laser receiver power high alarm : Off
Laser receiver power low alarm : Off
Laser receiver power high warning : Off
Laser receiver power low warning : Off
Laser output power : 1.089 mW / 0.37 dBm
Laser receiver power : 1.286 mW / 1.09 dBm
Laser receiver power high alarm : Off
Laser receiver power low alarm : Off
Laser receiver power high warning : Off
Laser receiver power low warning : Off
Laser output power : 1.112 mW / 0.46 dBm
Laser receiver power : 1.277 mW / 1.06 dBm
Laser receiver power high alarm : Off
Laser receiver power low alarm : Off
Laser receiver power high warning : Off
Laser receiver power low warning : Off
Laser output power : 1.153 mW / 0.62 dBm
Laser receiver power : 1.341 mW / 1.28 dBm
Laser receiver power high alarm : Off
Laser receiver power low alarm : Off
Laser receiver power high warning : Off
Laser receiver power low warning : Off

TX = output power
RX = receiver power

Typical TX RX Optical Power Range:

Parameter 10GBASE-LR 10GBASE-ER 10GBASE-ZR
Transmit Power (max) −1.0 dBm 2.0 dBm 4.0 dBm
Transmit Power (min) −6.0 dBm −1.0 dBm 0.0 dBm
Receive power (max) 0.5 dBm −1.0 dBm −7.0 dBm
Receive power (min) −11.0 dBm  −14.0 dBm −24.0 dBm
Distance 10km 40km 80km
TX/RX Wavelenght 1290-1330nm 1530-1565nm 1530-1565nm

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