Download All in One Cisco CCIE Lab Study Guide Second Edition PDF

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As shown in Figure 3−6, a PRI consists of 23 data channels (bearer channels) running at 56K or 64K each. Each B channel can be provisioned for data only, voice only, or both voice and data. A PRI also contains a single 64K signaling channel, called the D channel. The D channel is responsible for synchronization between the user and the ISDN switch as well as for call setup and teardown. Figure 3−6: ISDN PRI Unlike a BRI, each of the B channels on a PRI usually shares the same directory number. This means that all calls coming into the PRI will be hunted onto the first available B channel.

We also see that each B channel will drop its call after 90 seconds of inactivity. RouterA#show dialer BRI0/0 − dialer type = ISDN Dial String Successes Failures 8995201 0 0 0 incoming call(s) have been screened. Last called never Last status − BRI0/0:1 − dialer type = ISDN Idle timer (90 secs), Fast idle timer (20 secs) Wait for carrier (30 secs), Re−enable (15 secs) Dialer state is idle BRI0/0:2 − dialer type = ISDN Idle timer (90 secs), Fast idle timer (20 secs) Wait for carrier (30 secs), Re−enable (15 secs) Dialer state is idle The show ppp multilink command will display any active MLPPP bundles on the router.

National ISDN simplifies ISDN configuration because you no longer need to know exactly what type of switch you are connected to. Both the Lucent 5ESS and the Nortel DMS switches support National ISDN call control. 15 2. Lucent — A custom Lucent call control. 3. Nortel — A custom Nortel call control. People are often confused between the physical switch type and the switch signaling. A Lucent 5ESS for example can support both Lucent and National ISDN call signaling on the D channel. The switch type must be known when bringing up an ISDN PRI circuit because PRI circuits use either Lucent or Nortel call signaling control.

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