topic RE: 10 gig port of extreme X460G2-24x-10G4. It is showing low Rx power in ExtremeSwitching (EXOS/Switch Engine)

10 gig port of extreme X460G2-24x-10G4. It is showing low Rx power

priti — Wed, 15 Aug 2018 08:21:00 GMT

HI experts ,I have connected one server on 10 gig port of exterme X460G2-24x-10G4. It is showing low Rx power and port is not coming up. Please help

POC_SW01.23 # show ports 31 transceiver information

Port Temp TxPower RxPower TxBiasCurrent Voltage-Aux1/ Voltage-Aux2
(Celsius) (dBm) (dBm) (mA) Vcc (Volts) (Volts)
================================================================================
31 31.06 -2.76 -26.78* 8.63 3.34 N/A
================================================================================
N/A - parameter not applicable to transceiver connected to the port
* - value is out of normal range

# debug hal show optic port 31
Port 31
SFP or SFP+: SFP+
Signal: not present
TX Fault: no
SFP/SFP+ Vendor: FINISAR CORP.
SFP/SFP+ Part Number: FTLX8574D3BCL-EX
SFP/SFP+ Serial Number: 1639P-05940
SFP/SFP+ Manufacture Date: 160924
SFP/SFP+ Type: SFP/SFP+
Connector: LC
Type: SR
Wavelength: 850

RE: 10 gig port of extreme X460G2-24x-10G4. It is showing low Rx power

David_Rahn — Wed, 15 Aug 2018 08:26:00 GMT

why kind of fiber are you connecting it with? have you tried a different jumper?
if the RX is low the issue is that the light is not getting to the receiver. can you see the light coming out of the server SFP? ( I know you are not supposed to look etc... so do so at your own risk, 850 nm LED is not tooo dangerious)

RE: 10 gig port of extreme X460G2-24x-10G4. It is showing low Rx power

Erik_Auerswald — Wed, 15 Aug 2018 08:26:00 GMT

You can use a camera, e.g. from a phone, to avoid looking directly at the laser.

RE: 10 gig port of extreme X460G2-24x-10G4. It is showing low Rx power

Stephane_Grosj1 — Wed, 15 Aug 2018 14:06:00 GMT

Please, do NOT look directly at the fiber.

If Rx is too low, it's expected the port do not come up. The issue is either on the fiber plant, jumper, length, dust anywhere there's connection or the transmitter has an issue. Eventually a mix of all of it.

RE: 10 gig port of extreme X460G2-24x-10G4. It is showing low Rx power

Eric_Burke — Wed, 15 Aug 2018 14:31:00 GMT

It’s possible you simply need to swap fibers on one end of the patch. This is a common problem. As others said, red led is transmit and should go to dark connector on the opposing device.