From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001 From: Sven Eisenhauer Date: Fri, 10 Nov 2023 15:11:48 +0100 Subject: add new repo --- Bachelor/CCNA4/en_CCNA4_v30/ch2/2_2_7/buttons.html | 110 +++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_2_7/content.html | 152 +++++++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_2_7/index.html | 29 ++++ Bachelor/CCNA4/en_CCNA4_v30/ch2/2_2_7/media.html | 21 +++ 4 files changed, 312 insertions(+) create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_2_7/buttons.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_2_7/content.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_2_7/index.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch2/2_2_7/media.html (limited to 'Bachelor/CCNA4/en_CCNA4_v30/ch2/2_2_7') diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_2_7/buttons.html b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_2_7/buttons.html new file mode 100644 index 0000000..287aab0 --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_2_7/buttons.html @@ -0,0 +1,110 @@ + + + + + + + + + + + +New Page 1 + + + + + + + + + + + + + + + + + + + + + + + + +
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+ + 2.2 + WAN Technologies 
  + 2.2.7 + DSL 
+ + + + + + + +
+ Digital Subscriber Line (DSL) technology + is a broadband technology that uses existing twisted-pair telephone + lines to transport high-bandwidth data to service subscribers. DSL + service is considered broadband, as opposed to the baseband service + for typical LANs. Broadband refers to a technique which uses multiple + frequencies within the same physical medium to transmit data. The term + xDSL covers a number of similar yet competing forms of DSL + technologies: +
    +
  • Asymmetric DSL (ADSL)
    • +
  • Symmetric DSL (SDSL)
    • +
  • High Bit Rate DSL (HDSL)
    • +
  • ISDN (like) DSL (IDSL)
    • +
  • Rate Adaptive DSL (RADSL)
    • +
  • Consumer DSL (CDSL), also called + DSL-lite or G.lite
    • +
+

+ DSL technology + allows the service provider to offer high-speed network services to + customers, utilizing installed local loop copper lines. DSL + technology allows the local loop line to be used for normal + telephone voice connection and an always-on + connection for instant network connectivity. Multiple + DSL subscriber lines are multiplexed into a single, high capacity link + by the use of a DSL Access Multiplexer (DSLAM) at the provider + location. DSLAMs incorporate TDM + technology to aggregate many subscriber lines into a less cumbersome + single medium, generally a T3/DS3 connection. Current DSL technologies + are using sophisticated coding and modulation techniques to achieve + data rates up to 8.192 Mbps.

+

The voice channel of a standard + consumer telephone covers the frequency range of 330 Hz to 3.3 KHz. A + frequency range, or window, of 4 KHz is regarded as the requirements + for any voice transmission on the local loop. DSL technologies place + upload (upstream) and download (downstream) data transmissions at + frequencies above this 4 KHz window. This technique is what allows + both voice and data transmissions to occur simultaneously on a DSL + service. +

+

The two basic types of DSL technologies + are asymmetric (ADSL) and symmetric (SDSL). All forms of DSL service + are categorized as ADSL or SDSL and there are several varieties of + each type. Asymmetric service provides + higher download or downstream bandwidth to the user than upload + bandwidth. Symmetric service provides the same capacity in both + directions.

+

The different varieties of DSL provide + different bandwidths, with capabilities exceeding those of a T1 or E1 + leased line. The transfer rates are dependent on the actual length of + the local loop and the type and condition of its cabling. For + satisfactory service, the loop must be less than 5.5 kilometers (3.5 + miles). DSL availability is far from universal, and there are a wide + variety of types, standards, and emerging standards. It is not a + popular choice for enterprise computer departments to support home + workers. Generally, a subscriber cannot choose to connect to the + enterprise network directly, but must first connect to an Internet + service provider (ISP). From + here, an IP connection is made through the Internet to the enterprise. + Thus, security risks are incurred. To address security concerns, DSL + services provide capabilities for using Virtual Private Network (VPN) + connections to a VPN server, which is typically located at the + corporate site.

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+ + + Interactive Media Activity

+ +

Checkbox: WAN Technologies Digital Subscriber Line (DSL)

+

Upon completing this activity, the student + will be able to identify the characteristics associated with DSL + connections.

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