JARGON GUIDE - Mixonline

JARGON GUIDE

What would a broadband column be without some jargon? FTP File Transfer Protocol provides facilities for bidirectional transfers between remote computer
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What would a broadband column be without some jargon?

FTP

File Transfer Protocol provides facilities for bidirectional transfers between remote computer systems. FTP is a basic, no-nonsense method for moving entire files around the Net. Several ftp “clients,” as applications that perform this duty are called, provide the valuable ability to pick up a transfer where it left off if the connection fails, a common problem with dial-up service.

DWDM

Dense Wave Division Multiplexing is the frequency domain equivalent of time-domain multiplexing. DWDM is used by telcos to launch multiple data streams down a fiber, each carried on its own wavelength (or frequency or color, all the same thing) of coherent laser light. This allows one fiber to carry simultaneously many more streams of data than it was originally designed to carry, saving upgrade costs.

CIRCUIT SWITCHED

The Old Way. Think Ernestine the operator, patch cord in hand. Switched circuits mean that, at setup time, a connection is made between two parties to complete a “call.” When the call is finished, the entire connection structure is broken down to be rebuilt for the next call, a slow and inefficient process.

PACKET SWITCHED

The New Way. All nodes on the network are “always on,” and able to send, receive and forward “packets” of data, small quanta of information framed or “wrapped” in a virtual envelope with address and routing instructions “printed” on the outside.

POTS

Plain Ol' Telephone Service, that reliable product we all take for granted.

PSTN

Public Switched Telephone Network, which carries our POTS around the world.

QOS

Quality of Service is a generic network mechanism that provides some combination of guaranteed throughput, error rate and latency. The current PSTN uses RSVP protocols as a QoS Band-Aid.

SYMMETRICAL BROADBAND

Same speed/bandwidth in both directions, the “S” in SDSL. The less costly ADSL service is asymmetrical, with download speeds far greater than upload speeds.

VOIP

Voice over IP means simply that “telephone” voice traffic is encapsulated within IP packets rather than over traditional switched circuits, with great potential cost savings all around.

VPN

Virtual Private Networks provide virtual secure connections over an unsecure public network.

WAP

Wireless Application Protocol is a spec-defining, secure, bi-directional Net access via wireless devices, specifically those without keyboards. WAP is not an international standard and will most likely go the way of the dinosaur real soon.