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Glossary Section 0-9

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0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

10/100 indicates that the interface on the equipment can connect to either 10Base-T or at 100Base-T device. 

10-Base-2 IEEE 802 3 specification, similar to Ethernet, using thin coaxial cable that runs at 10 Mbps, with a maximum distance of 185 meters per segment. Also known as Thin Ethernet or Thinwire Ethernet..

10-Base-5 is also called Thick Ethernet and ThickWire. Connections are coaxial and operate at rates up to 10 Mbps.

10Base-F A physical layer communication specification for 10Mbps, baseband data transmission over a fiber-optic cable.

10Base-T IEEE 802.3 specification, using unshielded twisted-pair cabling and running at 10 Mbps.

100Base-T An Ethernet standard running at 100 Mbps It uses exactly the same CSMA/CD (Carrier Sense Media Access with Collision Detection) method as 10-BaseT for sharing the physical network medium between devices. Also known as Fast Ethernet. Three variants of 100Base-T exist: l00-Base-TX runs on 2 pairs from a category 5 Unshielded Twisted Pair (UTP) cable; 100Base-T4-runs on 4 pairs from a category 3 or better UTP cable, and 100-Base-FX-runs on optical fiber.

100BaseTX is the specification that describes how to run 100 Mbps Fast Ethernet over Category 5 Unshielded Twisted Pair. Catagory 5 UTP is the most popular type of cabling used in LANs today.

10 GbE Ten Gigabit (10,000,000,000 bits (10 billion)) Ethernet

100VG-AnyLan Another Ethernet standard running at 100 Mbps. In contrast to 100Base-T, 100VG was designed as a direct replacement for 10BaseT Ethernet that could run on the same category 3, 4, or 5 UTP cabling infrastructure in the same configuration—VG stands for "voice grade" and refers to the category 3 cable that can be used. It uses a completely different method from Ethernet—Demand Priority—to share the network medium between devices.

1822 Historic term which refers to the original ARPANET host-to-IMP interface. The specifications for this were given in BBN report 1822.

1U is equal to 1.75 inches. The "U" increment is a common data communications term to specify the height in a rack space that will be required. 

2B+D The Basic Rate Interface (BRI) in ISDN A single ISDN circuit divided into two 64 kbps digital channels for voice or data and one 16 kbps channel for low speed data (up to 9,600 baud) and signaling. 2B+D is carried on one or two pairs of wires depending on the interface, the same wire pairs that today bring a single voice circuit into your home or office. See ISDN.

23B+D In ISDN, also known as the Primary Rate Interface. A circuit with a wide range of frequencies that is divided in twenty-three 64 kbps paths for carrying voice, data, video, or other information simultaneously It bears a remarkable similarity to today’s T1 link, except that T1 carries 24 voice channels. In ISDN, 23B-i-D gives twenty-three channels and one D channel. for out of band signaling. However, in T1, signaling is handled in band. See ISDN.

2 Megabit Trunk The basic digital rate in most of the world, outside of North American and Japan. It consists of 32 - 64 kbps time slots, 0-31. Time slot 0 is reserved for synchronization, and time slot 16 is reserved for signaling.

30 Channel Trunk (E1) A circuit running at 2.048 mbps, and carrying 32 DS0s. Generally, only 30 of the 32 are available for customer data, the others are reserved for signaling and synchronization.

3/1/0 DACS A digital access & cross connect  system that can divide a DS-3 signal to the individual DS-1 or DS-0 level.

6B0NE The Internet’s experimental IPv6 network.

802.x The set of IEEE standards for the definition of LAN protocols.

802.11a IEEE specifications for a wireless LAN  5 GHz with data rates to 54 Mbps

802.11b IEEE specifications for a wireless LAN at 2.4 GHz with data rates to 11 Mbps

802.11g IEEE specifications for a wireless LAN at 2.4 GHz with data rates to 54 Mbps

802.11n IEEE amendment of the 802.11 standard which defines MIMO operation on the physical lay and incorporates improvements on the MAC layer.

822 Short form of "RFC 822." Refers to the format of Internet style e-mail as defined in RFC 822.

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Last modified: May 13, 2014
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