1 pertemuan 21 isdn concepts. discussion topics introducing isdn isdn standards and access methods...
DESCRIPTION
Digital Communication with ISDNTRANSCRIPT
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Pertemuan 21 ISDN Concepts
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Discussion Topics
• Introducing ISDN• ISDN standards and access methods• ISDN 3-layer model and protocols• ISDN functions• ISDN reference points• Determining the router ISDN interface• ISDN switch types
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Digital Communication with ISDN
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ISDN Benefits
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ISDN Standards
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ISDN Access Options
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ISDN 3-Layer Model
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ISDN Physical Layer (BRI)
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ISDN Data Link Layer
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Q.931 Messaging-Call Setup Example
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Call Processing
1. The D channel is used to send the called number to the local ISDN switch.
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. The remote ISDN switch signals the destination over the D channel.
4. The destination ISDN NT-1 device sends the remote ISDN switch a call-connect message.
5. The remote ISDN switch uses SS7 to send a call-connect message to the local switch.
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.
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ISDN Functions and Reference Points
R: the connection between a non-ISDN Terminal Equipment (TE2) and a Terminal Adapter (TA), e.g. an RS-232 serial interface.
S: references the points that connect into the customer switching device Network Termination type 2 (NT2) and enables calls between the various types of customer premises equipment.
T: electrically identical to the S interface, it references the outbound connection from the NT2 to the ISDN network or Network Termination type 1 (NT1).
U: the connection between the NT1 and the ISDN network owned by the telephone company.
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ISDN Functions and Reference Points
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BRI Reference Points
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Cisco ISDN BRI Interfaces
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ISDN Interfaces
S/T ISDN Interface
U ISDN Interface
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ISDN Switch Types