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Microcap & Penny Stocks : DGIV -- Good Prospects? -- Ignore unavailable to you. Want to Upgrade?

To: Howard C. who wrote (7599)	4/28/1998 10:34:00 AM
From: Michael Ulysses	Read Replies (1) \| Respond to of 7703

Definition of terms re: April 28 PRNewswire/Australia Digitcom is working with regional and national telephone companies, ISPs, and PSTN resellers in Europe and on the Pacific Rim to establish international long distance networks and to deploy its Internet-based telephony products using the company's "IntraVoice" gateway and voice compression technology. A point-of-presence (POP) is the location of an access point to the Internet. A POP necessarily has a unique Internet (IP) address. Your independent service provider (ISP) or online service provider (OSP) has a point-of-presence on the Internet. POPs are sometimes used as one measure of the size and growth of an ISP or OSP. A POP may actually reside in rented space owned by a telecommunications carrier such as Sprint. A POP usually includes routers, digital/analog call aggregators, servers, and frequently frame relay or ATM switches. ATM (asynchronous transfer mode) is a dedicated-connection switching technology that organizes digital data into 53-byte cells or packets and transmits them over a medium using digital signal technology. Individually, a cell is processed asynchronously relative to other related cells and is queued before being multiplexed over the line. Because ATM is designed to be easily implemented by hardware (rather than software), faster processing speeds are possible. The prespecified bit rates are either 155.520 Mbps or 622.080 Mpbs. IEEE Spectrum reports that speeds on ATM networks are expected to reach 10 Gbps. Along with SONET and several other technologies, ATM is a key component of broadband ISDN (BISDN). Frame relay is a technology for transmitting data packets in high-speed bursts across a digital network encapsulated in a transmission unit called a frame. Frame relay requires a dedicated connection during the transmission period. It's not ideally suited for voice or video transmission, which requires a steady flow of transmissions. However, under certain circumstances, it is used for voice and video transmission. Frame relay is used on wide area networks and also in private network environments with leased lines over T-1 lines. Frame relay is a fast-packet technology, which means that error-checking does not occur at any transmission stage. The end points are responsible for error checking. (However, the incidence of error in digital networks is extraordinarily small relative to analog networks.) Fast packet switching uses asynchronous transfer mode (ATM) with either frame relay or cell relay. Frame relay relays packets at the data-link layer of the Open Systems Interconnection (OSI) model rather than at the network layer. A frame can incorporate packets from different protocols such as Ethernet and X.25. It is variable in size and can be as large as a thousand bytes or more. The frame relay standard, an extension of the ISDN standards, is CCITT I.122. A frame relay connection is known as a virtual connection. A permanent virtual connection is totally dedicated to one origin and destination pair and can transmit up to 1.544 Mbps, depending on the capabilities of the pair. A switched virtual connection is also possible using the public network and can provide higher bandwidths.