Telecommunications Glossary of terms used on this site

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Term Definition
CRC

Cyclical Redundancy Check

Dark Fiber

Dark fiber is operational optical fiber infrastructure capacity that is not being utilized. Since optical fiber transports information represent by light pulses, dark fiber is also referred to as unlit fiber. Dark Fiber service is the practice of leasing unused capacity from a carrier or service provider.

detour LSP

A detour Label Switched Path, or detour LSP, is a Label Switched Path (LSP) which is setup to reroute network traffic in the event where the main LSP fails.

DIA

Dedicated Internet Access, or DIA, features extremely high reliability and performance including constant speeds or rates of data transmission guaranteed by a Service Level Agreement (SLA).

Aliases (separate with |): Dedicated Internet Access
Diffserv

A method used to classify IP packets so that different classes receive specific quality of service handling when forwarded in within a carrier network.

DLCI

A Data Link Connection Identifier, or DLCI, is a number attached to a data frame which identifies the Permanent Virtual Circuit (PVC) for the data frame.

Aliases (separate with |): Data Link Connection Identifier
DPT

Data Packet Transport, or DPT, is a Media Access Control (MAC) protocol that adds resiliency and protection to packet networks deployed in a ring topology.

DTLS

Decoupled Transparent LAN Services, or DTLS, is a service that emulates a Local Area Network (LAN) over an Internet Protocol (IP) Multiprotocol Label Switching (MPLS) network, and similar to Virtual Private LAN Services (VPLS). DTLS uniquely proposes to remove Layer 2 (L2) switching from the Provider Edge (PE) devices while restricting the L2 switching to the Customer Edge (CE) devices.

Dual Rate Bandwidth Profile

A Dual Rate Bandwidth Profile is a Bandwidth Profile where both sets of Committed Information Rate (CIR) / Committed Burst Size(CBS) and Excess Information Rate (EIR) / Excess Burst Size (EBS) properties are specified.

DWDM

Dense Wavelength Division Multiplexing, or DWDM, is an optical technology used to maximize bandwidth over existing high capacity fiber-optic carrier network backbones. DWDM increases bandwidth by transmitting and multiplexing, or combining multiple signals simultaneously at different wavelengths within the same fiber circuit. The result is that a single fiber circuit is leveraged and maximized into multiple virtual fiber connections. DWDM is protocol and bit-rate agnostic, or independent. DWDM networks can transmit data in IP, ATM, SONET/SDH, and Ethernet, and handle bit-rates from 100 Mbps, or Megabits up to 2.5 Gbps, or Gigabits per second.

Aliases (separate with |): Dense Wavelength Division Multiplexing
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