Checking TX / RX optical power for Cisco IOS, IOS-XR, NX-OS

Checking TX / RX optical power for Cisco IOS, IOS-XR, NX-OS
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 are the sample commands for checking the TX/RX optical power.

IOS / IOS-XE

If want to check TX & RX power for IOS based devices such as ASR1K ,e.g. interface GigabitEthernet 0/2/2,here’s how to do it:

IOS-router#show hw-module subslot x/x transceiver x status

Sample Output:

IOS-router#show hw-module subslot 0/2 transceiver 2 status

The Transceiver in slot 0 subslot 2 port 2 is enabled.
  Module temperature                        = +25.335 C
  Transceiver Tx supply voltage             = 3209.6 mVolts
  Transceiver Tx bias current               = 9704 uAmps
  Transceiver Tx power                      =  3.2 dBm
  Transceiver Rx optical power              = -5.3 dBm

IOS-XR (CRS)

show controllers <interface> phy

show controllers <interface> phy | i dB

Note you can do filtering like “ | include dB“

Sample Output:

RP/0/RP1/CPU0:IOS-XR-CRS#show controllers Te0/0/0/1 phy

XFP Detail Info:
================

Temp: 29.53
Tx bias: 27.166 mA
Tx power: 0.5140 mW ( -2.9 dBm)
Rx power: 0.2402 mW ( -6.2 dBm)
AUX 1: +3.3V Supply Voltage: 0x70
AUX 2: Auxiliary monitoring not implemented: 0x0

IOS-XR (ASR9K) (10GE)

show controllers <interface> phy

Sample Output:

RP/0/RSP0/CPU0:IOS-XR-ASR9k#show controllers Te0/3/0/1 phy

        Signal Condition Control: Normal Async REFCLK,
        Thresholds:                    Alarm High         Warning High          Warning Low            Alarm Low
              Temperature:               78.000                73.000                 5.000                 0.000
                  Voltage:           0.000 Volt            0.000 Volt            0.000 Volt            0.000 Volt
                     Bias:        100.000 mAmps          85.000 mAmps          15.000 mAmps           5.000 mAmps
           Transmit Power:  2.23870 mW (3.49996 dBm)   1.12200 mW (0.49993 dBm)   0.15130 mW (-8.20161 dBm)   0.07580 mW (-11.20331 dBm)
            Receive Power:  2.23870 mW (3.49996 dBm)   1.12200 mW (0.49993 dBm)   0.03630 mW (-14.40093 dBm)   0.01810 mW (-17.42321 dBm)
        Temperature: 31.402
        Voltage: 0.000 Volt
        Tx Bias: 40.820 mAmps
        Tx Power:  0.65210 mW (-1.85686 dBm)
        Rx Power:  0.51510 mW (-2.88108 dBm)

IOS-XR (ASR9K) (100GE)

show controllers <interface> phy

RP/0/RSP0/CPU0:IOS-XR-ASR9K#show controllers Hu0/2/0/1 phy

        Module
        Thresholds:                    Alarm High         Warning High          Warning Low            Alarm Low
              Temperature:            +80.000 C             +75.000 C              +0.000 C              -5.000 C
                  Voltage:           3.663 Volt            3.531 Volt            3.069 Volt            2.937 Volt

        Temperature: +36.835 C
        Voltage: 3.264 Volt

        Lanes
        Thresholds:                    Alarm High         Warning High          Warning Low            Alarm Low
              Temperature:            +62.507 C             +60.507 C             +54.507 C             +52.507 C
                     Bias:        103.284 mAmps          98.284 mAmps          57.364 mAmps          52.364 mAmps
           Transmit Power:  5.62000 mW (7.49736 dBm)   2.81000 mW (4.48706 dBm)   0.37000 mW (-4.31798 dBm)   0.14000 mW (-8.53872 dBm)
            Receive Power:  5.62340 mW (7.49999 dBm)   2.81830 mW (4.49987 dBm)   0.08710 mW (-10.59982 dBm)   0.03470 mW (-14.59671 dBm)

                Lane            Temp             Bias                   Tx Power                   Rx Power
                   0       +57.445 C     70.698 mAmps   0.78430 mW (-1.05518 dBm)   0.97850 mW (-0.09439 dBm)
                   1       +57.445 C     78.086 mAmps   0.74750 mW (-1.26389 dBm)   0.97000 mW (-0.13228 dBm)
                   2       +57.445 C     80.746 mAmps   0.75820 mW (-1.20216 dBm)   1.01760 mW (0.07577 dBm)
                   3       +57.445 C     78.684 mAmps   0.75790 mW (-1.20388 dBm)   1.09110 mW (0.37865 dBm)

CISCO NEXUS OS

show interface <interface> transceiver details

N7K-SWITCH# show interface Eth1/1 transceiver details

           SFP Detail Diagnostics Information (internal calibration)
  —————————————————————————-
                Current              Alarms                  Warnings
                Measurement     High        Low         High          Low
  —————————————————————————-
  Temperature   46.10 C        75.00 C     -5.00 C     70.00 C        0.00 C
  Voltage        3.34 V         3.63 V      2.97 V      3.46 V        3.13 V
  Current       31.12 mA       70.00 mA     1.00 mA    68.00 mA       2.00 mA
  Tx Power      -0.42 dBm       3.49 dBm  -12.19 dBm    0.49 dBm     -8.19 dBm
  Rx Power      -3.87 dBm       3.49 dBm  -18.38 dBm    0.49 dBm    -14.40 dBm
  Transmit Fault Count = 0
  —————————————————————————-
  Note: ++  high-alarm; +  high-warning; —  low-alarm; –  low-warning

Typical TX RX Optical Power Range: