10-Mbps baseband Ethernet specification using two pairs of twisted-pair cabling (Category 3, 4, or 5): one pair for transmitting data and the other for receiving data. 10Base-T, which is part of the IEEE 802.3 specification, has a distance limit of approximately 328 feet (100 meters) per segment.
100-Mbps baseband Fast Ethernet specification using UTP wiring. Like the 10Base-T technology on which it is based, 100Base-T sends link pulses over the network segment when no traffic is present. However, these link pulses contain more information than those used in 10Base-T. The 100Base-T specification is based on the IEEE 802.3 standard.
IEEE standards for the definition of LAN protocols.
1000-Mbps Gigabit Ethernet specification using two strands of multimode or single-mode fiber-optic cable per link. To guarantee proper signal recovery, a 1000Base-LX/LH link cannot exceed 1804 feet (550 meters) in length over multimode fiber or 32,810 feet (10 km) in length over single-mode fiber. Based on the IEEE 802.3 standard with reach over single-mode fiber extended from 5 km to 10 km.
1000-Mbps Gigabit Ethernet specification using two strands of multimode fiber-optic cable per link. To guarantee proper signal recovery, a 1000Base-SX link cannot exceed 1804 feet (550 meters) in length. The 1000Base-SX specification is based on the IEEE 802.3 standard.
1000-Mbps Gigabit Ethernet specification that refers to the 1000Base-ZX, 1000Base-SX, and 1000Base-LX standards for Gigabit Ethernet over fiber-optic cabling. The 1000Base-X specification is based on the IEEE 802.3 standard.
1000-Mbps Gigabit Ethernet specification using two strands of single-mode fiber-optic cable per link. To guarantee proper signal recovery, a 1000Base-ZX link cannot be longer than 62.1 miles (100 km). This is a Cisco specification.
Authorization, authentication, and accounting server.
Asynchronous Transfer Mode. International standard for cell relay in which multiple service types (such as voice, video, or data) are conveyed in fixed-length (53-byte) cells. Fixed-length cells allow cell processing to occur in hardware, thereby reducing transit delays. ATM is designed to take advantage of high-speed transmission media such as E3, SONET, and T3.
Bit error rate.
Cable television. References to headend or distribution hub.
Common channel signaling.
Circuit emulation service.
The color portion of a video signal.
Cable modem termination system, such as the Cisco uBR7225VXR router.
Cisco Network Registrar.
Customer premises equipment.
An alarm condition that might affect most or all subscribers that connect to the reporting node. To obtain more information about a problem, use the
show facility-alarm status command.
Major alarm and
Cisco Subscriber Registration Center.
Channel service unit/data service unit.
Clear To Send.
Data carrier detect.
Data circuit-terminating equipment (ITU-T expansion). Devices and connections of a communications network that comprise the network end of the user-to-network interface. The DCE provides a physical connection to the network, forwards traffic, and provides a clocking signal used to synchronize data transmission between DCE and DTE devices. Modems and interface cards are examples of DCE. Compare with
Dynamic Host Configuration Protocol.
Domain Name System.
Data-over-Cable Service Interface Specification.
Data set ready.
Data Service Unit. Device used in digital transmission that adapts the physical interface on a DTE device to a transmission facility such as T1 or E1. The DSU is also responsible for such functions as signal timing. Often used with CSU, as in CSU/DSU.
Data terminal equipment. Device at the user end of a user-network interface that serves as a data source, destination, or both. DTE connects to a data network through a DCE device (for example, a modem) and typically uses clocking signals generated by the DCE. DTE includes devices such as computers, protocol translators, and multiplexers.
Electronic Industries Alliance.
Erasable programmable read-only memory.
European Data-over-Cable Service Interface Specifications.
Any of a number of 100-Mbps Ethernet specifications. Fast Ethernet offers a speed increase 10 times that of the 10Base-T Ethernet specification, while preserving qualities such as frame format, MAC mechanisms, and MTU. Existing 10Base-T applications and network management tools can be used on Fast Ethernet networks. The Fast Ethernet specification is based on an extension to the IEEE 802.3 specification.
Forward error correction.
Nonvolatile storage that can be electrically erased and reprogrammed so that software images can be stored, booted, and rewritten as necessary. Flash memory was developed by Intel and is licensed to other semiconductor companies
Field-replaceable unit. A component that can be removed from a network device and replaced in the field. Line cards, power modules, and fan modules are typically FRUs.
Global positioning system.
H.323 VoIP network
Protocol that supports VoIP.
High-Level Data Link Control.
High-Speed Serial Interface.
International Electrotechnical Commission.
IEEE LAN protocol that specifies an implementation of the physical layer and the MAC sublayer of the data link layer. IEEE 802.3 uses CSMA/CD access at a variety of speeds over a variety of physical media. Extensions to the IEEE 802.3 standard specify implementations for Fast Ethernet and Gigabit Ethernet.
International Telecommunication Union-Telecommunications Standardization Sector.
ITU-T J.83 Annex A
Series J.83 deals with the transmission of television, sound programming, and other multimedia signals. Annex A defines the management interface between the customer premises equipment and the Frame Relay network for European channel plans.
Media Access Control.
One of a group of alarm conditions that are considered the second most severe of all reportable alarms. Major alarms affect several subscribers who connect to the reporting node. You can use the
show facility-alarm status Cisco IOS command to obtain more information about the problem.
Critical alarm and
Modulation error ratio.
One of a group of alarm conditions that are considered the third most severe of all reportable alarms. Minor alarms affect a single or small number of subscribers who connect to the reporting node. You can use the
show facility-alarm status Cisco IOS command to obtain more information about the problem. See also
Critical alarm and
Multiple system operator.
National Cable Television Association.
Network processing engine.
Network services engine.
National Television System Committee.
Nonvolatile random-access memory.
Online insertion and removal.
Phase alternating line.
Protocol control information.
Quadrature amplitude modulation. A modulation technique using variations in simple amplitude.
Quaternary phase shift keying. A compression technique used in modems and wireless networks.
Request to send.
Synchronous Digital Hierarchy.
Synchronous dynamic random-access memory.
SEquential Couleur Avec Memoire.
Simple Gateway Control Protocol.
Synchronous Optical Network. High-speed synchronous network specification developed by Bellcore and designed to run on optical fiber. STS-1 is the basic building block of SONET. It was approved as an international standard in 1988.
Static random-access memory.
Digital WAN carrier facility. T1 transmits DS1-formatted data at 1.544 Mbps through the telephone switching network.
Technical Assistance Center.
Time of day.
Trivial File Transfer Protocol.
Universal broadband router.
Voice over IP.
Virtual private network.
Voice Extension Ready.
X-level test point
A test point that is established by inserting a test signal of known amplitude into a fiber node and then measuring the output level amplitude at the headend optical receiver.