03-26-2024 04:53 AM
Hello,
I am planning to use Cisco ER SFP's (SFP-10G-ER) to connect a point-to-point circuit which is less than 10KM. I read in the datasheet SFP-10G-ER supports upto 40KM but it would require an attenuator to support less than 20km distance. Is it mandatory to have an attenuator? what will be the impact if I dont use attenuator ? pleas advise
Tks,
Raghavendra
03-26-2024 05:26 AM
- Check first actual reply from : https://www.reddit.com/r/networking/comments/5igacx/fibre_attenuators_how_do_to_figure_what_to_use/
Personally I would try without (first)
M.
03-26-2024 08:05 AM - edited 03-26-2024 08:07 AM
"Is it mandatory to have an attenuator?"
Depends on how you mean "mandatory".
"what will be the impact if I dont use attenuator ?'
You receivers might receive a signal stronger than spec. This may lead to data corruption. Possibly if too, too strong a laser signal, transceiver Rx might be damaged.
Chances of the foregoing should depend how far you stray from spec. So, for example, less risk for 19 Km vs. 1 Km.
03-26-2024 09:49 PM
Thank you both!.
in my case in the current scenario this circuit is terminated on a XENPAK-10G-ER+ module on a 6509. We are refreshing 6509 with 9606R and the wan interface module will be SFP-10G-ER. I did check the received power on the current set-up which looks to be less which is -5db
Optical Optical
Temperature Voltage Current Tx Power Rx Power
Port (Celsius) (Volts) (mA) (dBm) (dBm)
---------- ----------- ------- -------- -------- --------
Te1/1 32.8 0.00 89.4 -- 0.9 -5.0
and on the other side is a juniper device with 10G ER SFP transmits only 0.34db
Laser output power : 1.0810 mW / 0.34 dBm
We dont know the exact fibre running distance. am I safe to assume power is less so it should work without attenuator? appreciate your spport
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