Allied Telesis AR300 series manual

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Table of contents for the manual

  • Page 1

    C613-16030-00 REV B www .alliedtelesis.com How T o | Intr oduction Ideally , setting up an ISDN connection is v er y much a straightf orward process: z Connect the r outer to the ISDN network interface. z Configure ISDN call definitions on the router . See Ho w T o Conf igure ISDN Calls On Allied T elesis Routers , a vailable from www .alliedtelesi[...]

  • Page 2

    2 Ho w to tr oub leshoot ISDN Step 1: Is the r outer communicating with the ISDN netw ork at the signalling le vel? When the r outer is connected to the ISDN networ k, eith er by plugg ing it into an NT1 if the r outer ha s an S/T interface , or by plugging it dir ectly into the ISDN network if the r outer has a U interface , it establishes a low-l[...]

  • Page 3

    3 If the interface is not activated, the re ason could be one of the f ollowing: 1. The interface has been put into NT mode . O n t h e AT - A R 0 4 1 a n d AT - A R 0 4 2 m u l t i - B R I N S M modules it is possible to put the ISDN interface(s) into NT mode so that they can emulate a network switch interface. This can be useful for be nch testin[...]

  • Page 4

    4 3. The cable connecting the r outer to the ISDN network or NTI is faulty . T r y a differ ent cable . 4. There is a fault in the ISDN network or the NT1. If options 1, 2 and 3 do not show any faults on the router , then contact y our ISDN network pr ovider and see if they can fi nd the fault on their network. Step 2: Is the r outer communicating [...]

  • Page 5

    5 If the LAPD is not alive, the reason could be one of the f ollowing: 1. The TEI mode has been set incorr ectly . On a Basic Rate interface, the TEI mode ought to be automatic , so that the router does not mandate a TEI value to the switch, but will automatically accept whatev er v alue is assigned by the sw itch. The TE I mode of the BRI interfac[...]

  • Page 6

    6 When it comes to diagnosing an ISDN connection, the tw o most impor tant columns in this table are Duration and Cause. The Duration column The Duration column tells y ou immediately whet her or not the call ev er connected. If the entr y in this column is CLEARED , then the call ne ver connected. If the entry in this column is a time, then the ca[...]

  • Page 7

    7 Also , a call that is closed due to P AP/CHAP au thentication failure has a cause code of 16 because the call work ed fine at the ISDN lev el, a nd was closed due to an indication from the PPP la yer . In this case , if the local router decided that the P AP/CHAP username/ passw ord it receiv ed wer e invalid, then the le tter pr eceding the caus[...]

  • Page 8

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