Access

AP

Access Point Is a networking hardware device that allows a Wi-Fi compliant device to connect to a wired network. The WAP usually connects to a router (via a wired network) as a standalone device, but it can also be an integral component of the router itself. https://en.wikipedia.org/wiki/Wireless_access_point

ADSL

Asymmetric Digital Subscriber Line Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over copper telephone lines rather than a conventional voice band modem can provide. ADSL differs from the less common symmetric digital subscriber line (SDSL). Bandwidth (and bit rate) is greater toward the customer premises (known as downstream) than the reverse (known as upstream). This is why it is called asymmetric. Providers usually market ADSL as a service for consumers to receive Internet access in a relatively passive mode: able to use the higher speed direction for the download from the Internet but not needing to run servers that would require high speed in the other direction. https://en.wikipedia.org/wiki/Asymmetric_digital_subscriber_line

ATM

Asynchronous Transfer Mode Is a dedicated-connection switching technology that organizes digital data into 53-byte cell units and transmits them over a physical medium using digital signal technology. http://searchnetworking.techtarget.com/definition/ATM

BRI

Basic Rate Interface Or Basic Rate Access is an Integrated Services Digital Network (ISDN) configuration intended primarily for use in subscriber lines similar to those that have long been used for voice-grade telephone service. 128kbps. Circuit switched. https://en.wikipedia.org/wiki/Basic_Rate_Interface

BSSID

Basic Service Set Identifier Is the MAC address of the wireless access point (WAP) generated by combining the 24 bit Organization Unique Identifier (the manufacturer's identity) and the manufacturer's assigned 24-bit identifier for the radio chipset in the WAP. http://community.arubanetworks.com/t5/Wireless-Access/what-is-the-difference-between-SSID-and-BSSID/td-p/156842

BPDU

Bridge Protocol Data Unit Are data messages that are exchanged across the switches within an extended LAN that uses a spanning tree protocol topology. BPDU packets contain information on ports, addresses, priorities and costs and ensure that the data ends up where it was intended to go. BPDU messages are exchanged across bridges to detect loops in a network topology. The loops are then removed by shutting down selected bridge interfaces and placing redundant switch ports in a backup, or blocked, state. http://www.webopedia.com/TERM/B/BPDU.html

CSMA/CD

Carrier Sense Multiple Access/ Collision Detection In computer networking, is a network multiple access method in which carrier sensing is used, but nodes attempt to avoid collisions by transmitting only when the channel is sensed to be "idle". When they do transmit, nodes transmit their packet data in its entirety. https://en.wikipedia.org/wiki/Carrier_sense_multiple_access_with_collision_avoidance

CSMA/CA

Carrier Sense Multiple Access/Collision Avoidance It is a network multiple access method in which carrier sensing is used, but nodes attempt to avoid collisions by transmitting only when the channel is sensed to be "idle".[1][2] When they do transmit, nodes transmit their packet data in its entirety. It is particularly important for wireless networks, where the collision detection of the alternative CSMA/CD is unreliable due to the hidden node problem.[3][4] https://en.wikipedia.org/wiki/Carrier_sense_multiple_access_with_collision_avoidance

CAM

Channel Access Method Allows several terminals connected to the same multi-point transmission medium to transmit over it and to share its capacity. Examples of shared physical media are wireless networks, bus networks, ring networks and half-duplex point-to-point links. https://en.wikipedia.org/wiki/Channel_access_method

CSU

Channel Service Unit is a line Bridging device for use with T-carrier that: • is used to perform loopback testing, • may perform bit stuffing, • may also provide a framing and formatting pattern compatible with the network, • provides a barrier for electrical interference from either side of the unit, and • is the last signal regeneration point, on the loop side, coming from the central office, before the regenerated signal reaches a multiplexer or data terminal equipment (DTE). https://en.wikipedia.org/wiki/Channel_service_unit

CDMA

Code Division Multiple Access Is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. https://en.wikipedia.org/wiki/Code_division_multiple_access

DOCSIS

Data-over-Cable Service Interface Specification is an international telecommunications standard that permits the addition of high-bandwidth data transfer to an existing cable TV (CATV) system. It is employed by many cable television operators to provide Internet access (see cable Internet) over their existing hybrid fiber-coaxial (HFC) infrastructure. The version numbers are sometimes prefixed with simply "D" inshttps://en.wikipedia.org/wiki/DOCSISead of "DOCSIS" (e.g. D3 for DOCSIS 3). https://en.wikipedia.org/wiki/DOCSIS

E1

E-Carrier level 1 E-carrier system, which revised and improved the earlier American T-carrier technology, and this has now been adopted by the International Telecommunication Union Telecommunication Standardization Sector (ITU-T). It was widely adopted in almost all countries outside the US, Canada, and Japan. E-carrier deployments have steadily been replaced by Ethernet as telecommunication networks transitions towards all IP. An E1 link operates over two separate sets of wires, usually Unshielded twisted pair (balanced cable) or using coaxial (unbalanced cable). A nominal 3 volt peak signal is encoded with pulses using a method avoiding long periods without polarity changes. The line data rate is 2.048 Mbit/s (full duplex, i.e. 2.048 Mbit/s downstream and 2.048 Mbit/s upstream) which is split into 32 timeslots, each being allocated 8 bits in turn. Thus each timeslot sends and receives an 8-bit PCM sample, usually encoded according to A-law algorithm, 8,000 times per second (8 × 8,000 × 32 = 2,048,000). This is ideal for voice telephone calls where the voice is sampled at that data rate and reconstructed at the other end. The timeslots are numbered from 0 to 31. https://en.wikipedia.org/wiki/E-carrier

XDSL

Extended Digital Subscriber Line Refers to all DSL technologies such as SDSL, and ADSL.

ESSID

Extended Service Set Identifier Desc. -The Extended Service Set Identification (ESSID) is one of two types of Service Set Identification (SSID). In an ad hoc wireless network with no access points, the Basic Service Set Identification (BSSID) is used. In an infrastructure wireless network that includes an access point, the ESSID is used, but may still be referred to as SSID. An SSID is a 32-character (maximum) alphanumeric key identifying the name of the wireless local area network. Some vendors refer to the SSID as the network name. For the wireless devices in a network to communicate with each other, all devices must be configured with the same SSID. http://documentation.netgear.com/reference/esp/wireless/WirelessNetworkingBasics-3-04.html

ISDN

Integrated Service Digital Network ISDN is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network. It was first defined in 1988 in the CCITT red book. Prior to ISDN, the telephone system was viewed as a way to transport voice, with some special services available for data. The key feature of ISDN is that it integrates speech and data on the same lines, adding features that were not available in the classic telephone system. The ISDN standards define several kinds of access interfaces, such as Basic Rate Interface (BRI), Primary Rate Interface (PRI), Narrowband ISDN (N-ISDN), and Broadband ISDN (B-ISDN). URL: https://en.wikipedia.org/wiki/Integrated_Services_Digital_Network

OC

Optical Carrier are a standardized set of specifications of transmission bandwidth for digital signals that can be carried on Synchronous Optical Networking (SONET) fiber optic networks.[1] Transmission rates are defined by rate of the bitstream of the digital signal and are designated by hyphenation of the acronym OC and an integer value of the multiple of the basic unit of rate, e.g., OC-48. The base unit is 51.84 Mbit/s.[2] Thus, the speed of optical-carrier-classified lines labeled as OC-n is n × 51.84 Mbit/s. https://en.wikipedia.org/wiki/Optical_Carrier_transmission_rates

PRI

Primary Rate Interface a telecommunications interface standard used on an Integrated Services Digital Network (ISDN) for carrying multiple DS0 voice and data transmissions between the network and a user. PRI is the standard for providing telecommunication services to offices. It is based on the T-carrier (T1) line in the US and Canada, and the E-carrier (E1) line in Europe. The T1 line consists of 24 channels, while an E1 has 32. https://en.wikipedia.org/wiki/Primary_Rate_Interface

SDSL

Symmetric Digital Subscriber Line A specific type of DSL line. The upload and download links have the same speed in an SDSL line. Compare to DSL and ADSL.

SONET

Synchronous Optical Network A group of protocols used with fiber cable. Some SONET networks use ring topologies. Sometimes spelled out as Synchronous Optical Networking

VDSL

Very-high-bit-rate Digital Subscriber Line A type of DSL that provides faster transmission speeds than ADSL. CompTIA lists this as Variable Digital Subscriber Line, but this isn't common usage.