To the layperson, all fiber cables can seem the same, with the only potential difference being in their dimensions. But look closer and there is a myriad of variations between them - and choosing the right one for your project can be vital in terms of performance, cost, reliability and safety.
Previously, we’ve discussed the bodies that set standards for fiber types and how you can ensure you pick the right cable to meet safety requirements, outlined by the National Electrical Code, and fire regulations.
In this post, I’d like to explain a bit more about the differences between the specifications of the G.65x series of singlemode optical fiber families. These are set by the ITU-T and have equivalent specifications, created by the International Electrotechnical Commission (IEC).
Rather than refer to both ITU-T and IEC terminology, I’ll stick to the simpler ITU-T G.65x naming convention - you can see how the specifications match up in the table at the end of this handy guide from the FIA.
There are 19 singlemode variants in the G.65x series, but I’ll group them together where possible. I won’t cover the G.651 multimode fiber standards to avoid any confusion.