Term
| What device connects a local area network (LAN) to a T1 circuit? |
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Definition
| Channel service unit/data service unit (CSU/DSU) |
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Term
| Asynchronous Transfer Mode (ATM) |
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Definition
| A connection-oriented network architecture based on broadband ISDN technology that uses constans-size 53-byte cells instead of packets. Because cells don't change size, they are switched much faster and more efficiently than packets across a network. |
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Term
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Definition
| A device used to interconnect computing and networking equipment, via ethernet, with a television cable company's data netwrok through the same cable circuit used to deliver TV. the standard for data communications over the cable TV network is known as the data over cable service interface specification (DOCSIS) |
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Term
| Channel Service Unit (CSU) |
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Definition
| Generally used with a T1 internet line, it is used to terminate the connection from the T1 provider. The CSU is usually part of a CSU/DSU unit. It also provides diagnostics and testing if necessary. |
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Term
| Customer Premises Equipment (CPE) |
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Definition
| Items such as telephones, modems, and terminals installed at customer locations and connected to the service provider network. |
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Term
| Data Link Connection Identifiers (DLCIs) |
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Definition
| Used to identify virtual circuits in a Frame Relay network. |
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Term
| Demarcation point (demarc) |
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Definition
| The point on any telephone installation where the telephone lines from the central office enter the customer's premises. ISP's responsibility |
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Term
| High Bit-Rate Digital Subscriber Line (HDSL) |
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Definition
| The first DSL technology to use a higher-frequency spectrum of copper, twisted-pair cables. |
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Term
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Definition
| A permanent connection between two points. These connections are leased from telephone companies. |
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Term
| Permanent Virtual Circuit (PVC) |
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Definition
| A technology used by Frame Relay that allows virtual data communications (circuits) to be set up between sender and receiver over a packet-switched network. |
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Term
| Symmetric Digital Subscriber Line (SDSL) |
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Definition
| Type of DSL that provides the same speeds upstream and downstream. It is the opposite of ADSL. |
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Term
| Synchronous Optical Network (SONET) |
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Definition
| A standard in the U.S. that defines a base data rate of 51.84Mbps, Multiples of this rate are known as optical carrier (OC) levels, such as OC-3, OC-12, and so on. |
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Term
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Definition
| A series of digital connections leased from the telephone company. Each T-series connection is rated with a number based on speed. T1 and T3 are the most popular. |
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Term
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Definition
| In ISDN, the device (often erroneously referred to as an ISDN modem) that is used to interconnect ISDN-incompatible devices, such as PC serial ports or Ethernet interfaces and POTS phones, to an ISDN network for eventual connection to an ISDN circuit. |
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Term
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Definition
| Physical cables and/or wireless technology across which computers are able to communicate. |
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Term
| Very High Data-Rate Digital Subscriber Line (VDSL) |
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Definition
| A DSL technology that provides faster data transmission over a single flat untwisted or twisted pair of copper wires. VDSL is capable of supporting high-bandwidth applications such as HDTV as well as telephone services (Voice over IP) and general Internet access over a single connection |
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Term
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Definition
| A family of technologies that provides digital data transmission over the wires of a local telephone network. Collectively called Digital Subscriber Line (DSL), the family includes ADSL, VDSL, and SDSL. |
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Term
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Definition
| A telephone lines that form the backbone of a telephone network for a company. These lines connect the telephone(s) to the telephone company and to the PSTN. |
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Term
| Public Switched Telephone Network (PSTN) |
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Definition
| The US public telephone network. It is also called the plain old telephone service (POTS). |
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Term
| Plain Old Telephone Service (POTS) |
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Definition
| The classic analog cirucit commonly used to connect to the Public Switched Telephone Network (PSTN) to make voice calls for conversations and modem and facsimile sessions. |
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Term
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Definition
| A method of switching that sends information as potentially smaller discrete packets, each one independently addressed for the intended recipient. Intermediate devices, such as switches and routers, can send these packets along one or more different paths to the same destination, making the autonomy of each packet imperative. A packet-switched connection is virtual, and the physical paths are shared, in contrast to the concept of the dedicated paths of circuit switching. |
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Term
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Definition
| The part of the PSTN that goes from the central office to the demarcation point at the customer's premises. |
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Term
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Definition
| The device used to connect a local network (or single machine) to an ISDN network. It provides power to the line as well as translates data from the LAN or individual computer for transmission on the ISDN line. |
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Term
| Integrated Services Digital Network (ISDN) |
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Definition
| A telecommunications standard that is used to digitally send voice, data, and video signals over the same lines. |
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Term
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Definition
| A WAN technology that transmits packets over a WAN using packet switching. |
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Term
| Digital Subscriber Line (DSL) |
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Definition
| A digital WAN technology that brings high-speed digital networking to homes and businesses over POTS. There are many types, including HDSL (high-speed DSL) and VDSL (very high data-rate DSL) |
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Term
| Delta Channel (D channel) |
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Definition
| A channel on an ISDN line used for link management. For Basic Rate Interface (BRI) circuits, the D channel is 16Kbps. For the Primary Rate Interface (PRI), the D channel is 64Kbps. |
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Term
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Definition
| A switching method where a dedicated connection between the sender and receiver is maintained throughout the conversation. POTS and ISDN, for example, establish circuit-switched connections through dialed numbers. |
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Term
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Definition
| The office in any metropolitan or rural area that contains the telephone switching equipment for that area. The CO connects all users in that area to each other as well as to the rest of the PSTN. |
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Term
| What does the x in xDSL represent? |
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Definition
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Term
| Which WAN protocol utilizes packet-switching technology? |
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Definition
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Term
| What is the bandwidth of OC-12? |
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Definition
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Term
| Which wireless protocol utilizes a short-range communications technology facilitating data transmission from fixed and/or mobile devices, creating wireless personal area networks (PANs)? |
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Definition
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Term
| If you have a device in a telecommunications closet owned and installed by the telecommunications company (telco) and it's your responsibility to cable from this box to the CPE, which term should you use to refer to the device? |
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Definition
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Term
| Which cellular WAN technology has the best data rates? |
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Definition
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Term
| Which technology can eliminate VPN traffic between remote sites traversing the hub? |
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Definition
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Term
| Dynamic Multipoint VPN (DMVPN) |
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Definition
-Elimination of traffic between remote sites traversing the hub
-Elimination of additional bandwidth requirements at the hub
-Elimination of additional network delays
-Conservation of WAN bandwidth
-Lower costs for VPN circuits
-Increased resiliency and redundancy |
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Term
| You have an E1. How many DS0s are used in this point-to-point connection? |
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Definition
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Term
| Which WAN protocol utilizes cell-switching technology? |
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Definition
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Term
| For which part of a SIP trunk is the service provider responsible? |
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Definition
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Term
| Where does the local exchange carrier responsibility end on a WAN link? |
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Definition
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Term
| What is CIR in Frame Relay? |
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Definition
| Rate at which the Frame Relay switch guarantees to transfer data |
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Term
| What does the acronym DOCSIS stand for? |
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Definition
| Data Over Cable Service Interface Specifications |
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Term
| Which type of communication has a line speed of 1.544 Mbps? |
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Definition
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Term
| You have a small office, home office environment. What WAN technology would most likely be used? |
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Definition
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Term
| You are having DSL internet connection issues and time-outs. You check the interface on your router and notice a lot of input errors. What could be the cause of the problem? |
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Definition
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Term
| At which layers of the OSI model layers do WAN protocols operate? |
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Definition
| Physical, Data Link, Network |
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Term
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Definition
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Term
| Copper Line Drivers/Repeaters |
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Definition
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Term
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Definition
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Definition
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