Fiber Guide
Fiber Optic Connector Types
Connectors are how fibers meet equipment, frames and boxes. This guide explains the connector families buyers meet most often and the polish choices that must match across a link.
Connector families you will meet
Two families dominate modern fiber work. LC connectors are small-form-factor connectors common in data rooms and equipment-dense frames. SC connectors are larger push-pull connectors common in distribution and premises work. Both families serve single mode and multimode fiber; the family must match the equipment and panels already installed.
Other families exist for older or special installations. When extending an existing network, match what is already there rather than introducing a new family, because every mixed family needs adapters and adds a failure point.
Polish: UPC and APC in plain terms
Polish describes the shape of the fiber end-face inside the connector. UPC connectors use a flat, slightly domed polish. APC connectors use an angled polish. The angle changes how reflected light behaves in the link, which matters most in networks carrying sensitive signals.
The critical rule is simple: never mix UPC and APC in one mated pair. A flat polish mated to an angled polish seats badly and degrades the connection. Specify the polish type explicitly in your inquiry, and check it on delivery.
Specifying connectors in your inquiry
- Connector family at each end, matching existing equipment.
- Polish type: UPC or APC, identical on both sides of every mated pair.
- Fiber type: single mode or multimode, matching the link.
- Where connectors will be fitted: factory-fitted or site-terminated.
- Labeling for each connector and circuit.
- Confirm MOQ and lead time for your specification in your inquiry before ordering.
Ask About Terminal Box Supply
Describe your terminal box requirements and confirm compatibility with your planned connector interfaces in your inquiry.
Ask about fiber cable supply