Chap_6 Flashcards
DSL?
Digital Subscriber Lines
what is Broadband transmission?
internet access via cable, DSL, fiber to the home, wireless and satellite.
*providing high-speed transmission of services, such as data, voice, and video, over the Internet and other networks
CMTS?
cable modem termination system
CM>?
Cable Modem
Teleworking?
workers use internet and VPN’s to access the business network remotely and work from home or when traveling.
how common are IPsec VPNS?
IPsec = ip security virtual private networks, very common for teleworkers. **works on the layer 3 network layer to provide security.
what protocol technologies are used in a traditional WAN layer 2 technology?
Frame Relay, ATM, etc. the service provider is responsible for the level of security provided to customer.
RF?
Radio Frequencies.. used by cable to carry signals.
CAT?
Community Antenna Television: one antenna connects to several customers so they can all receive signals from a cable station.
HFC?
Hybrid Fiber-Coaxial networks:
- provides high speed communication both ways and does data, video and voice transmission.
SOHO
small office home office network
Downstream -when talking about cable signals?
direction of RF signal transmission such as TV channels from source. 50-860 MHz.
Upstream?
direction of R signal transmissions from subscriber to the provider. 5-42 MHz.
DOCSIS?
The Data-over-Cable Service Interface Specification:
— allows the use of high speed data transfer over existing CATV systems. provides internet access over the existing HFC infrastructure.
(TDMA
Time-Division Multiple Access :deterministic access method
(S-CDMA)
synchronous Code Division Multiple Access method (S-CDMA):
–deterministic access method
CMTS
Cable Modem Termination System (CMTS) at the headend of the cable operator
(CM
Cable Modem (CM) on the subscriber end
(ADSL)
asymmetric DSL:
–ADSL provides higher downstream bandwidth to the user than upload bandwidth
SDSL
symmetric DSL
–provides the same capacity in both directions.
CPE)
customer premises equipment
DSLAM
DSL access multiplexer :
Located at the CO of the carrier, the DSLAM combines individual DSL connections from users into one high-capacity link to an ISP, and therefore, to the Internet.
Transceiver
Connects the computer of the teleworker to the DSL. Usually the transceiver is a DSL modem connected to the computer using a USB or Ethernet cable
WiMAX
Worldwide Interoperability for Microwave Access
Municipal Wi-Fi
Municipal Wi-Fi (Mesh): Most municipal wireless networks use a mesh topology rather than a hub-and-spoke model. A mesh is a series of interconnected access points
(LTE
Long-Term Evolution (LTE) - A newer and faster technology considered to be part of 4G technology.
One-way multicast
one-way satellite-based Internet services can be used to push pages to local storage at end-user sites.
One-way terrestrial return
One-way terrestrial return - Satellite Internet systems use traditional dialup access to send outbound data through a modem and receive downloads from the satellite.
Two-way satellite Internet -
Two-way satellite Internet - Sends data from remote sites via satellite to a hub, which then sends the data to the Internet. The satellite dish at each location needs precise positioning to avoid interference with other satellites.
(VSAT
Very Small Aperture Terminals (VSAT): A VSAT is a type of satellite dish similar to the ones used for satellite TV from the home and is usually about 1 meter in width. The VSAT dish sits outside, pointed at a specific satellite, and is cabled to a special router interface, with the router inside the building. Using VSATs creates a private WAN.
(PPPoE
PPP over Ethernet : allows the sending of PPP frames encapsulated inside Ethernet frames. *DSL does not support PPP so this way PPP point to point can be used by encapsulating PPP inside ethernet frames.
