A cellular network that uses fourth generation wireless technology to deliver mobile broadband internet access in addition to voice and text messaging. Two synonymous 4G systems are commercially deployed: Mobile WiMAX an Long Term Evolution (LTE). LTE is the predominant system in the U.S.
Access Control List
Aspect of a computer files system; refers to a list of permissions attached to an object that specifies which users or processes are granted access.
Code Division Multiple Access
A 3G digital cellular technology that, unlike its competitors GSM and TDMA, does not assign a specific frequency to each mobile user. Instead, every channel uses all available spectrum, with conversations encoded via a pseudo-random digital sequence. In the U.S., cellular carriers Verizon and Sprint use CDMA for 3G, whereas AT&T and T-Mobile use GSM. However, 4G LTE is supplanting 3G, so the CDMA and GSM distinction is becoming less important.
Committed Information Rate
In a frame relay network, the average virtual circuit bandwidth (usually expressed in kilobits per second) guaranteed by an internet service provider, under normal conditions.
Distributed Antenna Systems
A network of physically distributed antenna nodes installed indoors or out that connect to a common source using a wireless service transport medium covering a specific geographic area or structure.
Deep Packet Inspection
Method of network traffic filtering that checks packet parts (and sometimes also the header) as they pass inspection points, looking for aberrations like viruses or spam. Non-compliant packets are cataloged and may be re-routed.
Guaranteed Bit Rate
Minimum bit rate expected to be available for uplink traffic; reserved bandwidth.
Global System for Mobile Communications
ETSI-defined standard for 2G and 3G digital cellular networks used by mobile phones. Considered the default global standard for mobile communications, particularly in Europe and Asia.
In the U.S., cellular carriers AT&T and T-Mobile use GSM for 3G, whereas Verizon and Sprint use CDMA. However, 4G LTE is supplanting 3G, so the CDMA and GSM distinction is becoming less important.
Online that that offers real-time text transmission over the internet.
Internet of Things
The interconnection of embedded computing devices within existing internet infrastructure. Typically refers to advanced connectivity of devices that go beyond traditional machine-to-machine communications. For example: heart monitoring implants, smart thermostat systems, or biochip transponders on farm animals.
Massive Multiple Input-Multiple Output
Concept proposed for 5G in which cellular base stations would be equipped with a very large number of antennas to provide order of magnitude improvement in spectral and energy efficiency using relatively simple linear processing.
Multiple Input-Multiple Output
Method of multiplying radio link capacity using multiple transmit and receive antennas to exploit multipath propagation.