 ADSL
(Asymmetric Digital Subscriber Line)
A DSL line where the upload speed is different from the download speed. Usually the download speed is much greater.
Bandwidth
The difference between the highest and lowest frequencies in a band. For example, a voice-grade cirucuit has a 4000 hertz bandwidth. In common sage, bandwidth refers to circuit capacity; when people say they need more bandwidth, they need a higher transmission speed
Channel
A path for transmission of electromagnetic signas. Or A data communication path. Each T-1 has 24 channels.
DSL
Digital Subscriber line. Various technology protocols for high-speed data, voice and video transmission over ordinary twisted-pair copper POTS (Plain Old Telephone Service) telephone wires.
SDSL
Symmetric DSL provides the same data transmission rate to and from the telephone network, often 1 Mbps in both direction.
ADSL
Asymmetric DSL provides lower upstream data rates , usually only 64 Kbps, combined with faster downsteam rate (i.e from the network), usually 1.544 Mbps.
VDSL
Very high-speed DSL provides much faster asymmertic rates, usually over very short distances (often 1.6 Mbps upstream and 51 Mbps downstream)
Fractional T1
A portion of a T-1 circuit. A full T1 allows transmission at 1.544,000 bits per second (1.544 Mbps). A fractional T1 circuit allows transmission at lower speed of 384 Kbps, 512 Kbps, 768 Kbps.
Frame Relay (Frame-relay)
In the context of computer networking, frame relay (also found written as "Frame-relay") consists of an efficient data transmission technique used to send digital information quickly and cheaply in a relay of frames to one or many destinations from one or many end-points. Network providers commonly implement frame relay for voice and data as an encapsulation technique, used between local area networks (LANs) over a wide area network (WAN). Each end-user gets a private line (or leased line) to a frame-relay node. The frame-relay network handles the transmission over a frequently-changing path transparent to all end-users.
High-speed Internet
Internet Service Provider (ISP). Broadband Internet access, often shortened to just broadband, is high-speed Internet access—typically contrasted with dial-up access over a modem.
ISP
Internet Service Provider (ISP). A company providing access to the internet.
Leased Line
A leased communication circuit that goes from your site to some other location. It is a clear, unbroken communicatin path that is yours to use 24x7. Also called Private Line or Dedicated Line.
Line
A circuit, channel, or link. It carries the data communication signals. An early telephone technology term that may imply a physical connection, such as with a copper wire.
Link
An unbroken circuit path between two points. Sometimes called a line, channel, or circuit.
Local Loop
The part of a communication circuit between the subscriber's equipment and the equipment in the local central office.
MAN
A network that usually covers a city-wide area. Because MANs use local area network and fiber optic technologies, transmission speeds can very from 2 million to 100 million bits per second.
Point-to-point
Denoting a circuit, channel, or line that has only two terminals.
POP
Point of presence - The point to which the local phone company terminates subscribers' circuit for long distance leased lines. The closer your company location is from the POP of the local phone company the lower local loop charges for the T1, T3 or DS3, OC3, other circuits.
POTS
Short for plain old telephone service, which refers to the standard telephone service that most homes use. In contrast, telephone services based on high-speed, digital communications lines, such as ISDN and FDDI, are not POTS. The main distinctions between POTS and non-POTS services are speed and bandwidth. POTS is generally restricted to about 52 Kbps (52,000 bits per second).
PRI
Short for Primary-Rate Interface, a type of ISDN service designed for larger organizations. PRI includes 23 B-channels (30 in Europe) and one D-Channel. In contrast, BRI (Basic-Rate Interface), which is designed for individuals and small businesses, contains just two B-channels and one D-channel.
SIP (Session Initiation Protocol)
Is a very flexible protocol that has great depth. It was designed to be a general-purpose way to set up real-time multimedia sessions between groups of participants. For example, in addition to simple telephone calls, SIP can also be used to set up video and audio multicast meetings, or instant messaging conferences.
WAN
A network spanning a large geographical area. its nodes can span city , state, or national boundaries. They typically use circuits provided by common carriers. Contrast with backbond network, LAN, MAN.
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