Integrated Services Digital Network

The functional part of the Signaling System No.7 (SS7) protocol, i.e., the part that specifies the interexchange signaling procedures for the set up and tear down of trunk calls between networks. The ISDN User Part is one of the specified users of the Message Transfer Part (MTP) transport capability of the SS7 interconnections. The user part identification is encoded in… (Read More →)

1. IP Multimedia Services Identity Module,
2. IMS Identity Module.

Abbreviation for industrial, scientific, and medical applications (of radio frequency energy).

A Web page feature in which hyperlinks are assigned or "mapped" to different portions of a graphic image.
Note: Users access links by using a mouse to click on mapped areas. ISMAP requests are processed by common gateway interface (CGI) scripts on the server.

International Organization for Standardization

Abbreviation for Internet Society. A nongovernmental, international organization for global cooperation and coordination for The Internet and its internetworking technologies and applications.

A line on a map or chart joining points associated with a constant time difference from the transmitter to receiver of electromagnetic waves, such as radio waves, at all points along the line. [From Weik '89]

1. Of a periodic signal, pertaining to transmission in which the time interval separating any two corresponding transitions is equal to the unit interval or to a multiple of the unit interval.
2. Pertaining to data transmission in which corresponding significant instants of two or more sequential signals have a constant phase relationship.
Note: "Isochronous" and "anisochronous" are characteristics, while… (Read More →)

In a data network where the information-bearer channel rate is higher than the input data signaling rate, transmission performed by interrupting, at controlled intervals, the data stream being transmitted.
Note 1: Isochronous burst transmission enables communication between data terminal equipment (DTE) and data networks that operate at dissimilar data signaling rates, such as when the information-bearer channel rate is higher… (Read More →)