Call Us +44 0207 378 1400

clarity and precision


Search for glossary terms (regular expression allowed)
Term Main definition
A connecting block that is designed to accommodate higher densities of connectors and to support higherfrequency applications. The 110-blocks are found on patch panels and cross-connect blocks for data applications.
Hits - 2517

1G (or 1-G) refers to the first generation of wireless telephone technology (mobile telecommunications). These are the analog telecommunications standards that were introduced in the 1980s and continued until being replaced by 2G digital telecommunications. The main difference between the two mobile telephone systems (1G and 2G), is that the radio signals used by 1G networks are analog, while 2G networks are digital.

Although both systems use digital signaling to connect the radio towers (which listen to the handsets) to the rest of the telephone system, the voice itself during a call is encoded to digital signals in 2G whereas 1G is only modulated to higher frequency, typically 150 MHz and up. The inherent advantages of digital technology over that of analog meant that 2G networks eventually replaced them almost everywhere.

One such standard is NMT (Nordic Mobile Telephone), used in Nordic countries, Switzerland, the Netherlands, Eastern Europe and Russia. Others include AMPS (Advanced Mobile Phone System) used in North America and Australia,[1] TACS (Total Access Communications System) in the United Kingdom, C-450 in West Germany, Portugal and South Africa, Radiocom 2000[2] in France, TMA in Spain, and RTMI in Italy. In Japan there were multiple systems. Three standards, TZ-801, TZ-802, and TZ-803 were developed by NTT (Nippon Telegraph and Telephone Corporation[3]), while a competing system operated by DDI (Daini Denden Planning, Inc.[3]) used the JTACS (Japan Total Access Communications System) standard.

The antecedent to 1G technology is the mobile radio telephone, or 0G.

Hits - 2649
2 Port System

A ‘2 Port System’ refers to the number of antennas (connectors) used by either a 2G or 3G system in a particular sector e.g. a X-Polarised Antenna (i.e. x2 connectors) is a x2 Port System (i.e. x2 antennas)

Hits - 2407

Shortcut for describing basic ISDN service (2B+D = two bearer channels and one data channel, which indicates two 64Kbps channels and one 16Kbps channel used for link management).

Hits - 2152

2G (or 2-G) is short for second-generation wireless telephone technology.

Second generation 2G cellular telecom networks were commercially launched on the GSM standard in Finland by Radiolinja (now part of Elisa Oyj) in 1991.[1] Three primary benefits of 2G networks over their predecessors were that phone conversations were digitally encrypted; 2G systems were significantly more efficient on the spectrum allowing for far greater mobile phone penetration levels; and 2G introduced data services for mobile, starting with SMS text messages. 2G technologies enabled the various mobile phone networks to provide the services such as text messages, picture messages and MMS (multi media messages). All text messages sent over 2G are digitally encrypted, allowing for the transfer of data in such a way that only the intended receiver can receive and read it.

After 2G was launched, the previous mobile telephone systems were retroactively dubbed 1G. While radio signals on 1G networks are analog, radio signals on 2G networks are digital. Both systems use digital signaling to connect the radio towers (which listen to the handsets) to the rest of the telephone system.

2G has been superseded by newer technologies such as 2.5G, 2.75G, 3G, and 4G; however, 2G networks are still used in many parts of the world.

Hits - 2848

3G, short form of third generation, is the third generation of mobile telecommunications technology.

This is based on a set of standards used for mobile devices and mobile telecommunications use services and networks that comply with the International Mobile Telecommunications-2000 (IMT-2000) specifications by the International Telecommunication Union.

3G finds application in wireless voice telephony, mobile Internet access, fixed wireless Internet access, video calls and mobile TV.

3G telecommunication networks support services that provide an information transfer rate of at least 200 kbit/s. Later 3G releases, often denoted 3.5G and 3.75G, also provide mobile broadband access of several Mbit/s to smartphones and mobile modems in laptop computers. This ensures it can be applied to wireless voice telephony, mobile Internet access, fixed wireless Internet access, video calls and mobile TV technologies.

A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1981/1982.

Each generation is characterized by new frequency bands, higher data rates and non–backward-compatible transmission technology. The first 3G networks were introduced in 1998 and fourth generation "4G" networks in 2008.

Hits - 2365

Signal encoding method used in 100Base-TX/FX Fast Ethernet and FDDI standards. Four-bit binary values are encoded into 5-bit symbols.

Hits - 2396

4G, short for fourth generation, is the fourth generation of mobile telecommunications technology, succeeding 3G . A 4G system must provide capabilities defined by ITU in IMT Advanced. Potential and current applications include amended mobile web access, IP telephony, gaming services, high-definition mobile TV, video conferencing, 3D television, and cloud computing.

Two 4G candidate systems are commercially deployed: the Mobile WiMAX standard (first used in South Korea in 2007), and the first-release Long Term Evolution (LTE) standard (in Oslo, Norway and Stockholm, Sweden since 2009). It has however been debated if these first-release versions should be considered to be 4G or not, as discussed in the technical definition section below.

In the United States, Sprint (previously Clearwire) has deployed Mobile WiMAX networks since 2008, while MetroPCS became the first operator to offer LTE service in 2010. USB wireless modems were among the first devices able to access these networks, with WiMAX smartphones becoming available during 2010, and LTE smartphones arriving in 2011. 3G and 4G equipment made for other continents are not always compatible because of different frequency bands. Mobile WiMAX is not available for the European market as of April 2012.

Hits - 2538
5-4-3 Rule

A rule that mandates that between any two nodes on the network, there can only be a maximum of five segments,connected through four repeaters, or concentrators,and only three of the five segments may contain user connections.

Hits - 2125
50-pin connector

Commonly referred to as a telco, CHAMP, or blue ribbon connector. Commonly found on telephone switches,66-blocks, 110-blocks, and 10Base-T Ethernet hubs and used as an alternate twisted-pair segment connection method. The 50-pin connector connects to 25-pair cables, which are frequently used in telephone wiring systems and typically meet Category 3. Some manufacturers also make Category 5e

Hits - 2158
A configuration used to test alien crosstalk in the lab whereby six disturber cables completely surround and are in direct contact with a central disturbed cable.Required testing for all CAT-6A cables by ANSI/TIA-568-C.2.
Hits - 2222
66-type connecting block

Connecting block used by voice-grade telephone installations to terminate twisted pairs. Not recommended for LAN use.

Hits - 1978
800 sbc

The 800 MHz EE+H3G combiner/diplexer

Hits - 1983

Signal encoding method used by the 1000Base-X Gigabit Ethernet standards.

Hits - 2118

Signal encoding method used in 100Base-T4 Fast Ethernet standard.

Hits - 2360