A duplex
zipcord fiber has two 900um tight-buffered fibers which are
strengthened with Kevlar and coated with a 3mm jacket which
can be riser or plenum rated. Plenum fiber is required
in some areas of a building. Duplex fiber can be either
singlemode or multimode. This cable is also referred
to as Siamese cable. Recommended application: patch cable(s).