What is BS EN 50377‑14‑1 about?
BS EN 50377‑14‑1 discusses optical fibre communication systems. BS EN 50377‑14‑1 contains the initial, start of life, dimensional, optical, mechanical and environmental performance requirements for simplex and duplex cords. A simplex or duplex cord refers to a length of cable with connector plugs assembled at both cable ends.
The typical length is (but is not limited to) 2 m to 10 m, measured from tip to tip at the extremes.
These cords are installed in mechanically protected locations (inside cabinets, distribution frames and enclosures).
Who is BS EN 50377‑14‑1 for?
BS EN 50377‑14‑1 on simplex and duplex cords (product specifications) is useful for:
- Manufacturers of fibre communication systems and devices
- The telecommunication industry
- Design engineers
- Quality control personnel
Why should you use BS EN 50377‑14‑1?
BS EN 50377‑14‑1 gives you product specifications for manufacturing simplex and duplex cords.
Simplex and duplex cords made from simplex plugs with cylindrical ferrules allow your fibre communication systems to provide better data transfer speed. These may have a single male key that is used to limit, and may be used to orientate, the relative rotation between mated connectors. A cover (dust cap) is provided to protect the ferrule end faces, when the connectors are in the unmated condition.
BS EN 50377‑14‑1 includes specifications for dimensions and marking of the product, including any associated spring force. This is measured and inspected using the appropriate EN test method.
Using BS EN 50377‑14‑1 guidelines to manufacture simplex and duplex cords lets you meet performance requirements to be categorized as an EN standard product.

