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ISDN Standards Overview 1

General Datacomm. ISDN Standards Overview 1. E Series protocols Telephone network standards such as E.164 for international addressing etc. I Series protocols Concepts, terminology and general methods such as I.200 services etc. Q Series protocols

jolene-rasmussen
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ISDN Standards Overview 1

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  1. General Datacomm ISDN Standards Overview 1 • E Series protocols • Telephone network standards such as • E.164 for international addressing etc. • I Series protocols • Concepts, terminology and general • methods such as I.200 services etc. • Q Series protocols • Switching and signaling standards such as; • Q.921 describes data-link LAPD • Q.931 describes network layer KCC 18th August 2002

  2. General Datacomm ISDN Standards Overview 2 • PRI STANDARDS • In USA and Japan T1/DS1 • 23 x 64kbps bearer (B) channels • 1 x 64kbps data (D) channel • In UK Australia & Europe • 30 x 64kbps (B) channels • 1 x 64 kbps (D) channel • H channels bond multiple B channels • BRI STANDARDS • Most countries now 64kbps • few remain on 56kbps • 2 x 64kbps (B) channels • 1 x 16kbps (D) channel KCC 18th August 2002

  3. General Datacomm ISDN Example Topologies BRI S/T EXAMPLE SITE IN EUROPE/UK Routers have BRI S/T interface and connect Into Telco supplied NT1 EXAMPLE SITE IN USA Local-Loop (U interface) available direct into the Router without the need for external NT1 BRI U BRI U I S D N BRI U NT1 TE1 with NT1 built in BRI T EXAMPLE OF LARGER SITE IN EUROPE/UK Routers can connect via NT1 or via NT2 using the BRI S/T interface Or any serial device can connect through a TA BRI S NT2 TE1 BRI S TA TE2 V.24 serial R V.35 serial R TE2 KCC 18th August 2002

  4. General Datacomm ISDN BRI startup sequence Line inactive TE becomes active and signals a 7E HDLC flag (7E = “01111110”) Network switch send frame with the A-bit set to 0 (A=0 = no activated) TE then synchronises on three successive pairs of line code voilations TE then starts sending physical frames NT synchronises using line code violations NT starts sending frames with A-bit set to 1 (A=1 = activated) KCC 18th August 2002

  5. RJ-45 pin NT RJ-45 TE Wire LT RJ-45 NT Polarity 3 Transmit Receive + 4 Tip 4 4 Receive Transmit + 5 Ring 5 5 Receive Transmit - 6 Transmit Receive - General Datacomm ISDN Physical BRI S/T Interface (RJ-45) Pinouts BRI U Interface (RJ-45-to-RJ-45) Pinouts KCC 18th August 2002

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