IBM 19K5716 manual IBM Isdn PC CardUser’s Guide

interface is similar to an E1 line. The total data rate is 2.048 Mbit/s. However, the PRI provides 30 ISDN B channels and one D channel, all operating at 64 kbit/s. PRIs can be used in large RAS environments.

•S0 interface - Another name for the BRI interface in Europe, where the telephone company generally provides the NT device. For BRIs in point-to- multipoint configuration, the S0 interface is a four-wire data bus.

•S2M interface - Another name for the PRI in Europe.

•S/T interface - The European reference point for connecting ISDN terminal equipment to the ISDN network. This interface is provided by the NT-1, which in Europe is furnished by the telephone company.

•SLIP - Serial Line Internet Protocol. A TCP/IP protocol used for communication between two machines that have been previously configured for communication with each other. Your Internet service provider can provide you with an SLIP connection, for example, so the provider’s server can respond to your requests, pass them on to the Internet, and forward your responses from the Internet back to you. Your dial-up connection server is typically on a slower serial line, rather than on the parallel or multiplex lines, such as those of a provider’s network. SLIP only works with staticIP addresses and is considered obsolete. SLIP works on OSI layer 2.

•SPID - The Service Profile Identifier (SPID) is a number assigned by the telephone company to a terminal on an ISDB B channel. A SPID tells equipment at the phone company’s central office about the capabilities of each terminal (computer, phone etc.) on the B channels. A basic-rate home or business user can divide service on the two B channels using one for normal telephone service and the other for data. The SPID tells the phone company whether the terminal accepts voice or data information. Technically, the SPID is a numeric string from 3 to 20 digits in length. One or more SPIDs are assigned when you order the ISDN basic-rate interface (BRI) from the phone company. Beginning in 1998, most phone companies began to use a generic SPID format. In this format, the SPID is a 14-digit number that includes your 10-digit telephone number (which in turn includes the 3-digit Numbering Plan Area [NPA] or area code), a 2-digit Sharing Terminal Identifier, and a 2- digit Terminal Identifier (TID). The generic SPID format makes it easier to tell users what to specify when installing ISDN equipment, and simplifies corporate installation procedures. SPIDs are used only in the United States of America and Canada.

•Supplementary Service - Additional ISDN capabilities that are available only in Euro ISDN. Some of them are standard convenience features, others are only are available upon request. Supplementary Services include Calling Line Identification (CLI), Call Forwarding (CF), Closed User Group (CUG), etc. Your telephone company can provide more information on Supplementary Services.

•T carrier system - The T carrier system, introduced by the Bell System in the U.S. in the 1960s, was the first successful system that supported digitized voice transmission. The original transmission rate (1,544 Mbit/s) of the T1 line is in widespread use today in enterprise connections to the Internet. A higher multiplex level, the T-3 line, providing 44,736 Mbit/s, is also commonly used by Internet service providers. Another commonly installed service is fractional T1, which is the rental of some portion of the 24 channels in a T1

228IBM ISDN PC Card:User’s Guide