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ISDN REFERENCE MODEL

ISDN REFERENCE MODEL. BASIC RATE ACCESS (BRI). 2B + D S0 interface. B-CHANNEL. BRI. B-CHANNEL. D-CHANNEL. TELEPHONE CALL. 408-526-1234. D-CHANNEL. CONVERSATION. B-CHANNEL. END. D-CHANNEL. B-CHANNEL. B-CHANNEL. E1 PRIMARY RATE INTERFACE (PRI). E1 PRI or S2 interface

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ISDN REFERENCE MODEL

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  1. ISDNREFERENCEMODEL

  2. BASIC RATE ACCESS (BRI) • 2B + D • S0 interface B-CHANNEL BRI B-CHANNEL D-CHANNEL

  3. TELEPHONE CALL 408-526-1234 D-CHANNEL CONVERSATION B-CHANNEL END D-CHANNEL

  4. B-CHANNEL B-CHANNEL E1 PRIMARY RATE INTERFACE (PRI) • E1 PRI or S2 interface • Used in Europe • 30 B + D E1-PRI D-CHANNEL

  5. S T U V NT 2 NT1 LT ET TE1 R TE 2 TA S T U V NT1 LT ET TE1 R TE 2 TA REFERENCE POINTS • Reference points characterize the different interfaces

  6. POINT TO POINT CONFIGURATION • Supported on BRI and PRI • Maximum 1 TE • Maximum 1 km (BRI) • Most straightforward wiring configuaration TE NT1 Max 1km

  7. SHORT PASSIVE BUS • Only on BRI • Maximum 8 TE • Each TE can be located anyware along the passive bus • Passive bus distance maximum 200 m • Distance TE to passive bus maximum 7 - 10 m Max 200 m NT1 Max 7 - 10 m

  8. LONG PASSIVE BUS • Only on BRI • Maximum 8 TE • All TE must be concentrated at the last 50 m of the bus • Passive bus distance maximum 500 m • Distance TE to passive bus maximum 7 - 10 m Max 500 m NT1 Max 50 m Max 7 - 10 m

  9. STAR CONFIGURATIONS • Only on BRI • Maximum 8 TE • Passive bus in a box • NT1 with multiple S0 ports • Distance TE to NT1 maximum 7 - 10 m Max 7 - 10 m NT1

  10. Q.921 - LAPD TE ET [ NT1 LT THE DATA LINK LAYER • The ISDN network does not impose the use of any data link layer protocol for the B channels • On the D channel the use of Q.921 or LAPD is defined • LAPD : Link Access Procedure on the D channel • Specified in CCITT I.441 and Q.921 • Q.921 protocol is used between the TE and the local ISDN switch (not end to end !)

  11. Q.931

  12. PROGRESS AND ALERTING • Optional progress and allerting messages are possible SETUP SETUP TE ET ET TE CALL PROCEEDING PROGRESS PROGRESS ALERTING ALERTING CONNECT CONNECT CONNECT ACK

  13. CALL REFUSED • Call can be refused for various reasons SETUP SETUP TE ET ET TE RELEASE COMPLETE RELEASE COMPLETE

  14. CALL CLEARING • Any side can clear the call DISCONNECT DISCONNECT TE ET ET TE RELEASE RELEASE RELEASE COMPLETE RELEASE COMPLETE

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