4 votes

What is the difference between LR1 and LR4 optics?

As in 10GBASE-LR versus 40GBASE-LR4? -L stands for long ~1300 nm wavelength (as opposed to -S for 850 nm and -E for ~1550 nm). -R stands for large block code 64b/66b. The suffix 4 stands for the ...
Zac67's user avatar
  • 84.4k
2 votes
Accepted

Support for 10GBase-T RJ45 SFP+ transceivers

In many enterprises, switches and accessories are required to be under active vendor support. That leaves you with officially supported SFP modules and their support in switches. Technically, using ...
Zac67's user avatar
  • 84.4k
1 vote

Is configuring FEC mandatory in designing 100G networks? What's the difference FEC makes with DACs vs optics?

FEC is mandatory for some -R PHYs and optional for others. IEEE 802.3 Clause 74.1 sums it up quite nicely - FEC is used to reduce the bit error rate (BER) below 10-12 where needed. FEC is optional for ...
Zac67's user avatar
  • 84.4k

Only top scored, non community-wiki answers of a minimum length are eligible