I have a fiber data circuit delivered by Cogent and my 1000LX SFP won't light up. I'm using the orange SM patch cable they provided. Also tried my own patch cable. This is how it looks (I'm receiving -40 dBm). Using FS SFP-1G-LX-31 transceiver.
DMZ03#show interface Gi0/11 transceiver
ITU Channel not available (Wavelength not available),
Transceiver is internally calibrated.
If device is externally calibrated, only calibrated values are printed.
++ : high alarm, + : high warning, - : low warning, -- : low alarm.
NA or N/A: not applicable, Tx: transmit, Rx: receive.
mA: milliamperes, dBm: decibels (milliwatts).
Optical Optical
Temperature Voltage Tx Power Rx Power
Port (Celsius) (Volts) (dBm) (dBm)
--------- ----------- ------- -------- --------
Gi0/11 50.3 3.18 -6.9 -40.0
For fun, I swapped the polarity and got this (receiving -29.6 dBm)
DMZ03#show interface Gi0/11 transceiver
ITU Channel not available (Wavelength not available),
Transceiver is internally calibrated.
If device is externally calibrated, only calibrated values are printed.
++ : high alarm, + : high warning, - : low warning, -- : low alarm.
NA or N/A: not applicable, Tx: transmit, Rx: receive.
mA: milliamperes, dBm: decibels (milliwatts).
Optical Optical
Temperature Voltage Tx Power Rx Power
Port (Celsius) (Volts) (dBm) (dBm)
--------- ----------- ------- -------- --------
Gi0/11 50.2 3.18 -6.9 -29.6
Looks bad both ways... But why do I get something back when reversing the polarity? Is that a reflection of my own transmitted signal?
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