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That’s not a bidi SFP. The attenuators aren’t needed either. Then there’s the fact you are ordering from Aliexpress, rather than Fiberstore. Fiberstore has mul

That’s not a bidi SFP. The attenuators aren’t needed either. Then there’s the fact you are ordering from Aliexpress, rather than Fiberstore. Fiberstore has multiple locations and warehouses, a returns policy, a level of customer service and no shipping charges.

baybal2 6y ago
Yes, it's not a BiDi, and I think they messed up with the text. I picked the attenuators for the power of proper 10G-LR, so yeah, they are probably not needed for the short range transceivers.
- iptrans 6y ago
  LR optics don’t require attenuators. OP didn’t mess up the text. They clearly wanted bidi optics as they only ran one strand.
  - baybal2 6y ago
    Can you identify what those 1.4km transceivers are? https://www.aliexpress.com/wholesale?SearchText=1.4km+10g https://www.aliexpress.com/wholesale?SearchText=1.4km+10g Are they even remotely standard compatible?
    - iptrans 6y ago
      1.4 km is a curious distance. Perhaps they are optics that didn’t make the 2 km cut and are sold at a discount? I wouldn’t worry too much about the standards. There are lots of optics that don’t stick to the standards, but go above and beyond. I’m more interested in the use case at hand and if the specs will support the use case.
      - baybal2 6y ago
        I saw a lot of singlemode wired datacentres in China, worked on them, but never bothered to look what they use for hardware. I wonder if this is the proprietary semi-standard that big Chinese telcos push for top of the rack hardware. I once heard that Huawei was trying to do singlemode with VCSEL laser, but the descriptions clearly identify those as using 1310nm DFB http://www.6comgiga.com/downloadRepository/826d97f5-c91a-4545-ad90-7c44ecc5e61e.pdf http://www.6comgiga.com/downloadRepository/826d97f5-c91a-454... . It is not a 2km multimode
  - baybal2 6y ago
    I mean, the item on the aliexpress. I always thought that 10G LR has quite a big minimum length. Edit: in practice, only 2m minimum length with normal LR transceivers actually.

baybal2 6y ago

Yes, it's not a BiDi, and I think they messed up with the text. I picked the attenuators for the power of proper 10G-LR, so yeah, they are probably not needed for the short range transceivers.

iptrans 6y ago
LR optics don’t require attenuators. OP didn’t mess up the text. They clearly wanted bidi optics as they only ran one strand.
- baybal2 6y ago
  Can you identify what those 1.4km transceivers are? https://www.aliexpress.com/wholesale?SearchText=1.4km+10g https://www.aliexpress.com/wholesale?SearchText=1.4km+10g Are they even remotely standard compatible?
  - iptrans 6y ago
    1.4 km is a curious distance. Perhaps they are optics that didn’t make the 2 km cut and are sold at a discount? I wouldn’t worry too much about the standards. There are lots of optics that don’t stick to the standards, but go above and beyond. I’m more interested in the use case at hand and if the specs will support the use case.
    - baybal2 6y ago
      I saw a lot of singlemode wired datacentres in China, worked on them, but never bothered to look what they use for hardware. I wonder if this is the proprietary semi-standard that big Chinese telcos push for top of the rack hardware. I once heard that Huawei was trying to do singlemode with VCSEL laser, but the descriptions clearly identify those as using 1310nm DFB http://www.6comgiga.com/downloadRepository/826d97f5-c91a-4545-ad90-7c44ecc5e61e.pdf http://www.6comgiga.com/downloadRepository/826d97f5-c91a-454... . It is not a 2km multimode
- baybal2 6y ago
  I mean, the item on the aliexpress. I always thought that 10G LR has quite a big minimum length. Edit: in practice, only 2m minimum length with normal LR transceivers actually.