A fiber optic line without terminal equipment provided by the telephone company, and without switching.
Fiber optic wiring that has been installed but has not been turned on yet. Often, companies that lay fiber optic cabling will lay extra cable, since the...
A Verizon Wholesale solution offered to customers that provides an unlit, continuous fiber optic strand within an existing, in-place Verizon fiber optic cable sheath without fiber optic transmission equipment or intermediate repeaters. Learn more.
Unused fiber; a fiber carrying no light.
An optical fiber infrastructure using cabling and repeaters for communications. Usually a dedicated fiber link between two sites that is used by one client.
An inactive fiber-optic strand without electronics or optronics, i.e., no connected transmitters, receivers, regenerators, etc. (See also- Dry Fiber)
Optical fiber infrastructure (cabling and repeaters) that is currently in place but is not being used. Optical fiber conveys information in the form of light pulses so the "dark" means no light pulses are being sent.
Fiber optic cables without multiplexers or amplifiers. Carriers can lay dark fiber and add SONET, Gigabit Ethernet and wavelength division multiplexers at a later date.
Dark fiber refers to unused fiber-optic cable. The dark strands can be leased or sold to individuals or other companies who want to establish optical connections among their own locations.
Fiber optic cable that is not in use. Since fiber optic cable uses light pulses to transmit information, cable that is not transmitting data is referred to as dark. Several thousands of miles of dark fiber exist in the United States today, and can be leased to other companies. Usually, companies with extremely high data transmission requirements (such as banks) build fiber optic networks that are larger than they need, in anticipation of greater needs in the future. This costs less than intermittently installing new cable. Dark fiber is also available from companies that constructed lavish networks in the e-business boom of the '90s and could no longer afford to maintain them.
Fiber that has been installed but currently is not used (or "lit"). It is provisioned for future expansion and may or may not be terminated in a patch panel.
Refers to Optical Fiber that is brand new--not yet used.
optical fiber that has been buried or deployed, but does not currently transport traffic; this fiber is considered "dark" or "unlit"
A fiber-optic cable that is not being used, and therefore has not been turned on, or ‘lit.' Dark fiber carries no signal, and is referred to as ‘dark' because it lacks the light transmission by which fiber carries data. See also Lit Fiber.
Unused fiber; fiber that has been installed but is reserved for future use. Carrying no light. Learn more about Dark Fiber...
Dark fiber refers to unlit and therefore unused fiber-optic cable. Often, companies lay more fiber lines than are needed at the time, and defer the cost of the associated fiber-optic components until increased network traffic justifies the extra investment.
Inactivated fiber-optic line and no associated opto-electronics. Dark fiber refers to the physical cable itself, rather than a certain amount of bandwidth or transport capacity. Massive amounts of dark fiber are being deployed by telephone companies and utilities, in anticipation of eventual use when the opto-electronics can be added at lower costs.
Fiber optic cable that is not in use (i.e., carrying light). If provided or sold, the recipient/buyer is expected to install equipment to transmit information (i.e., "light") the cable.
Unused fiber optic cable, sometimes referred to as "unlit glass."
Fiber optic cables which aren't being used and therefore have no light being sent through them.
A fiber strand without any light flowing through it. Dark fiber is sometimes provided to corridor owners in lieu of, or in addition to, rent.
Unused fiber-optic cable that has been deployed but does not have the proper electronic and optical equipment to carry optical (light) signals. Generally considered to be extra fiber that will support future demand for communications capacity.
Fiber-optic cable that has been installed but is not lit—that is, there are no active light sources.
In fiber-optic communications, dark fiber or unlit fiber (or fibre) is the name given to individual fibers that have yet to be used within cables that have been already laid. They are hence not yet connected to any device, and are only there for future usage.