Colocation Defined
Colocation Glossary Index
For definitions associated with co-location and datacentres, please browse the glossary of terms below.
D Channel
The "data" signalling channel, in the ISDN scheme; this is the channel that carries signalling and limited packet communications. In Basic Rate ISDN, this is a full duplex 16Kbps channel; in Primary Rate ISDN, this is a full duplex 64Kbps channel.
Dark Fibre
Dark fibre refers to unused fibre-optic cable. Often times companies lay more lines than what's needed in order to curb costs of having to do it again and again. The dark strands can be leased to individuals or other companies who want to establish optical connections among their own locations.
Data Terminal Equipment (DTE)
Typically the device that transmits data such as a personal computer or data terminal.
Dedicated Line
A transmission circuit that is reserved by the provider for the full-time use of the subscriber. Also called a Private Line.
Demodulation
Conversion of a carrier signal or waveform (analog) into an electrical signal (digital).
Dial up
The process of initiating a switched connection through the network; when used as an adjective, this is a type of communication that is established by a switched-circuit connection.
Digital Subscriber Line
A general term for any local network loop that's digital in nature; technically, DSL equates to ISDN, but this is decreasingly enforced terminology.
Direct dial inward (DDI)
Enables you to dial directly into a company and reach an extension without routing through a switchboard operator.
Downstream
In xDSL, the communications from the network towards the customer premises.
