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/ch4/4_1_4/buttons.html | 109 +++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch4/4_1_4/content.html | 175 +++++++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch4/4_1_4/index.html | 29 ++++ Bachelor/CCNA4/en_CCNA4_v30/ch4/4_1_4/media.html | 21 +++ 4 files changed, 334 insertions(+) create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch4/4_1_4/buttons.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch4/4_1_4/content.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch4/4_1_4/index.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch4/4_1_4/media.html (limited to 'Bachelor/CCNA4/en_CCNA4_v30/ch4/4_1_4') diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch4/4_1_4/buttons.html b/Bachelor/CCNA4/en_CCNA4_v30/ch4/4_1_4/buttons.html new file mode 100644 index 0000000..d616ece --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch4/4_1_4/buttons.html @@ -0,0 +1,109 @@ + + + + + + + + + + + +New Page 1 + + + + + + + + + + + + + + + + + + + + + + + +
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+ + 4.1 + ISDN Concepts 
  + 4.1.4 + ISDN functions 
+ + + + + + +
+ +

Several exchanges must occur for one + router to connect to another using ISDN. To establish an ISDN call, + the D channel is used between the router and the ISDN switch. Signal + System 7 (SS7) signaling is used between the switches within the + service provider network.

+ +

The D channel between the router and + the ISDN switch is always up. Q.921 describes the ISDN data-link + processes of LAPD, which functions like Layer 2 processes in the OSI + reference model. The D channel is used for call control functions such + as call setup, signaling, and termination. These functions are + implemented in the Q.931 protocol. Q.931 specifies OSI reference model + Layer 3 functions. The Q.931 standard recommends a network layer + connection between the terminal endpoint and the local ISDN switch, + but it does not impose an end-to-end recommendation. Because some ISDN + switches were developed before Q.931 was standardized, the various + ISDN providers and switch types can and do use various implementations + of Q.931. Because switch types are not standard, routers must have + commands in their configuration specifying the ISDN switch to which they + are connecting.

+ +

The following sequence of events occurs + during the establishment of a BRI or PRI call: +

+
    +
  1. The D channel is used to send the + called number to the local ISDN switch. +
    2. +
  2. The local switch uses the SS7 signaling protocol to set up a path + and pass the called number to the remote ISDN switch. +
    3. +
  3. The remote ISDN switch signals the destination over the D + channel.
    4. +
  4. The destination ISDN NT-1 device sends the remote ISDN switch a + call-connect message.
    5. +
  5. The remote ISDN switch uses SS7 to send a call-connect message + to the local switch. +
    6. +
  6. The local ISDN switch connects one B channel end-to-end, leaving + the other B channel available for a new conversation or data + transfer. Both B channels can be used simultaneously. +
    7. +
+ + + + +
+ + + + + +
+ +
+ + + + + +
+ + + + + +
  +

+ + + Interactive Media Activity

+ +

Drag and Drop: ISDN Functions

+

When the student has completed this activity, the student + will be able to correctly identify the ISDN establishment cycle.

+ +

+
+
+ + +     + + + + + + + +
+ + + + + +
+ +
+ + + + + +
+ + + + + +
  +

+ + Web Links

+ + +

Integrated Services Digital Network (ISDN)

+ + http://www.cisco.com/univercd/cc/ + td/doc/cisintwk/ito_doc/isdn.htm

+ +

+

+
+
+

+       +      +

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