Chapter 2 WAN concepts at TU Berlin

Flashcards and summaries for Chapter 2 WAN concepts at the TU Berlin

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DSL

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CAD

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WANs in the OSI Model

  • WAN operations focus primarily on the physical layer (OSI Layer 1) and the data link layer (OSI Layer 2).

  • WAN access standards typically describe both physical layer delivery methods and data link layer requirements.

  • The data link layer requirements include physical addressing, flow control, and encapsulation.

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  • Layer 1 protocols describe how to provide electrical, mechanical, operational, and functional connections to the services of a communications service provider.

  • Layer 2 protocols define how data is encapsulated for transmission toward a remote location, and the mechanisms for transferring the resulting frames. A variety of different technologies are used, such as the Point-to-Point Protocol (PPP), Frame Relay, and ATM. Some of these protocols use the same basic framing or a subset of the High-Level Data Link Control (HDLC) mechanism.


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Common WAN Terminology 

  • CPE

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Common WAN Terminology 

DCE

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Common WAN Terminology 

DTE 


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Common WAN Terminology 

Local Loop

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Common WAN Terminology

Demarcation Point

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Common WAN Terminology

Central Office (CO)

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Common WAN Terminology

Toll network -.

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WAN Devices 

  • Dialup modem

  • Access server

  • Broadband modem

  • CSU/DSU

  • WAN switch

  • Router

  • Core router/Multilayer switch

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Exemplary flashcards for Chapter 2 WAN concepts at the TU Berlin on StudySmarter:

Chapter 2 WAN concepts

DSL

Digital Subscriber Line

Chapter 2 WAN concepts

CAD

computer-aided drawing () 


Chapter 2 WAN concepts

WANs in the OSI Model

  • WAN operations focus primarily on the physical layer (OSI Layer 1) and the data link layer (OSI Layer 2).

  • WAN access standards typically describe both physical layer delivery methods and data link layer requirements.

  • The data link layer requirements include physical addressing, flow control, and encapsulation.

WAN access standards are defined and managed by a number of recognized authorities:

  • Telecommunications Industry Association and the Electronic Industries Alliance (TIA/EIA)

  • International Organization for Standardization (ISO)

  • Institute of Electrical and Electronics Engineers (IEEE)


Chapter 2 WAN concepts


  • Layer 1 protocols describe how to provide electrical, mechanical, operational, and functional connections to the services of a communications service provider.

  • Layer 2 protocols define how data is encapsulated for transmission toward a remote location, and the mechanisms for transferring the resulting frames. A variety of different technologies are used, such as the Point-to-Point Protocol (PPP), Frame Relay, and ATM. Some of these protocols use the same basic framing or a subset of the High-Level Data Link Control (HDLC) mechanism.


...

Chapter 2 WAN concepts

Common WAN Terminology 

  • CPE

Customer Premises Equipment (CPE) - The CPE consists of the devices and inside wiring located on the enterprise edge connecting to a carrier link. The subscriber either owns the CPE or leases the CPE from the service provider. A subscriber, in this context, is a company that arranges for WAN services from a service provider.

Chapter 2 WAN concepts

Common WAN Terminology 

DCE

Data Communications Equipment (DCE) - Also called data circuit-terminating equipment, the DCE consists of devices that put data on the local loop. The DCE primarily provides an interface to connect subscribers to a communication link on the WAN cloud.

Chapter 2 WAN concepts


Common WAN Terminology 

DTE 


Data Terminal Equipment (DTE) - The customer devices that pass the data from a customer network or host computer for transmission over the WAN. The DTE connects to the local loop through the DCE.

Chapter 2 WAN concepts

Common WAN Terminology 

Local Loop

- The actual copper or fiber cable that connects the CPE to the CO of the service provider. The local loop is also sometimes called the “last-mile”.

Chapter 2 WAN concepts

Common WAN Terminology

Demarcation Point

– This is a point established in a building or complex to separate customer equipment from service provider equipment. Physically, the demarcation point is the cabling junction box, located on the customer premises, that connects the CPE wiring to the local loop. It is usually placed for easy access by a technician. The demarcation point is the place where the responsibility for the connection changes from the user to the service provider. When problems arise, it is necessary to determine whether the user or the service provider is responsible for troubleshooting or repair.

Chapter 2 WAN concepts

Common WAN Terminology

Central Office (CO)

- The CO is the local service provider facility or building that connects the CPE to the provider network.

Chapter 2 WAN concepts

Common WAN Terminology

Toll network -.

This consists of the long-haul, all-digital, fiber-optic communications lines, switches, routers, and other equipment inside the WAN provider network

Chapter 2 WAN concepts

WAN Devices 

  • Dialup modem

  • Access server

  • Broadband modem

  • CSU/DSU

  • WAN switch

  • Router

  • Core router/Multilayer switch

- Voiceband modems are considered to be a legacy WAN technology. A voiceband modem converts (i.e., modulates) the digital signals produced by a computer into voice frequencies. These frequencies are then transmitted over the analog lines of the public telephone network. On the other side of the connection, another modem converts the sounds back into a digital signal (i.e., demodulates) for input to a computer or network connection.

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