Forum Discussion

Aspirant

Jul 28, 2017

Solved

SFP+ slots do not work at 1GE on GS728TXS

According to its specification the Netgear GS728TXS switch supports optical signals with line rates of 1GE or 10GE on ports xg25..xg28. All works fine for 10GE optical signals with SFP+ (single rate 10G and dual rate 1G/10G) on all respective ports, however 1GE signals are not working on any of those ports with SFP+ (dual rate) or SFP for 1GE . Link stays down. Seems the switch completely ignores the 1GE and I did not find any information in the HW/SW manuals on how to make that work. It is definitely not a cabling problem. Also the "Switching/Port configuration" menu has no speed selection of 1000M and AUTO obviously does not the job. Plugging in an SFP or SFP+ always shows a speed of "10G Full". The switch uses the latest firmware 6.1.0.36, Ports are configured as "Ethernet" (e.g. non-stacking,). Any guess what I missed and how the switch can be configured to accept 1GE optical signals. Thanks.

SFP SFP+ GSX728TXS 1GE

switchfox
Aug 10, 2017
Hi John,

thanks a lot for your assistance. I now successfully made it work. It was a combination of several things:
-- Some of my SFPs (although compliant to 1000BaseSX/LX) are not working in the GS728TXS for whatever reason
-- The dual rate SFP+s are always used at 10GE and the GS728 obviously cannot be configured to use them at 1GE
-- The optical RX power sometimes was accidentally in the overload region.
    ==> Would have been very helpful if the GS728 Web GUI (e.g. in the switching ports list) showed the RX level
            of the plugged in SFP or even other information contained in the SFP-internal EEPROM or at least
            LOS/Overload status.

In conclusion this is the "Accepted Solution".

Thanks again for your help

Kind regards

Switchfox

5 Replies

JohnC_V
NETGEAR Moderator
Aug 04, 2017
Hi switchfox,

Welcome to the community!

Smart switches will automatically detect if it is a 1G/10G speed. It will still be depending on the module that you are using. May I know what SFP module are you using?

Regards,
- switchfox
  Aspirant
  Aug 05, 2017
  Hi John,
  
  thanks for taking care of my question. Find below a selection of transceivers I used with GS728TXS
  
  -- Finisar, FTLX1472M3BCL, SFP+, 9.95 to 11.3Gb/s, 10GBASE-LR/-LW ==> works
  -- Lumentum, PLRXPL-Sx-S43-22-N, SFP+, 10.312 Gb/s, 10GBASE-LR/LW ==> works
  -- Finisar, FTLX1471D3BCV, SFP+(dual rate), 1.25 Gb/s or 9.95 to 10.3 Gb/s, 1000BASE-LX & 10GBASE-LR/LW ==> works at 10GE but does not work at 1GE
  -- Lumentum JSH-42L4DD1, SFP, 1.06 to 4.25GB/s, 1000BASE-LX ==> does not work
  -- Lumentum, PLRXPL-VE-SG4-38, SFP, 1.06 to 4.25GB/s, 1000BASE-SX ==> does not work
  
  Could you provide some part numbers of SFP/SFP+ that are known to be working?
  Are there special setting in the SFP EEPROM settings (SFF-8472) that are required?
  
  Kind regards
  Switchfox
  - JohnC_V
    NETGEAR Moderator
    Aug 05, 2017
    switchfox,
    
    We only recommend NETGEAR modules for our smart switches. But you can still use a 3rd party modules as long as it is working.
    
    You may check this link.
    
    Regards,