Glossary

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There are currently 11 terms in this directory beginning with the letter D.
Dark Fiber
Optical fiber that has already been laid out but is not being used for transmission. This dark fiber provides potential for future network scale up or can be leased to other carriers.

Datacenter Interconnects
Links used to connect one datacenter with another. They are usually on the range of a few kms or tens of kms
DCI

Datacom
Data communication: the industry that focuses on installating and maintaining links between datacenters or inside a data center.

Demarcation Technology
Technologies that provide the interface between the provider's access network and the end customer's on-premises wiring / network.
DEMARC

Dense Wavelength Division Multiplexing
A WDM standard that has much narrower channel space than DWDM, with 0.4 or 0.8 channel spacing. It is used for links in which carriers want to maximize their fiber capacity or very dense access networks.
DWDM

Digital Signal
A signal that varies discontinuously and is just sampling (not a full representation) of a physical quantity.

Digital Signal Processor
The component of a communication systems that codes or decodes digital data from a signal. It's necessary for coherent communications.
DSP

Discrete Photonics
A photonic approach in which the components are manufactured separately and then interconnected via optical fiber. This is contrast to integrating the photonic components on a single chip.

Distributed Access Architecture
Architectures that decentralize the access network of a provider, splitting the headend into several nodes.

Docsis
The standard that regulates cable provider links to subscribers.

Downstream
The telecommunications link that goes from the carrier to the end user. It is the channel that users download data with.