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ISDN 

1. How ISDN will be inserted in the WAN implementation, how data will be sent across the ISDN link, and the benefits of ISDN for a small site:

ISDN will be inserted at the community school to provide part-time connectivity to the WAN. ISDN will also serve as a backup link from each school to it's nearest regional hub when the main link goes down.

ISDN will also be used for the district office and the service centre to carry out remote maintenance on the routers when necessary.

For the community school, ISDN will be setup with dial-on-demand routing. This feature uses interesting packets to setup a call when routing is needed to the WAN. Interesting packets can be IP packets that need to be sent to an external network to the Community School. Packets matching conditions in a dialer-list will be able to initiate a call to the WAN core hub and have the packets routed to the relevant network.

ISDN is beneficial to a small site because ISDN provides access to digital video, circuit switched data, and telephone network services by using the normal telephone network that is circuit switched. ISDN offers a faster data transfer rate than modems. DDR can provide network routing and directory services in numerous ways to provide the illusion of full time connectivity over circuit switched connections. DDR can be less xpensive than dedicated-line or multipoint solutions.


2.Implementation Of ISDN In Design Of Network

Bandwidth available to the Community School will be based on ISDN Basic Rate Interfaces. The basic rate interface uses to B or bearer channels. Each channel has a capcity to transmit and receive at 64 Kbps. Using these two channels will enable a total bandwidth of 128 Kbps. Each channel can be used independantly to supply data transfer and / or telephony.

A Cisco ISDN BRI (S/T interface) WAN interface card will be installed in the Community School's router and in the WAN hub's router to provide an ISDN link between the two locations. This card provides the S/T interface reference point in an ISDN implementation. For the backup link between each WAN core hub and each school, this same card will be used in the WAN core router and each school router. The U interface between the router and Telstra will be provided by a device provided by Telstra. This device will plug into the router and the network boundary point.


3.General Configuration Commands:

configure terminal

< > indicates information needing to be given by Telstra for input into configuration

isdn switch-type <switch type>
dialer-list 1 protocol ip permit (Establishes interesting traffic to setup ISDN connections)

interface bri 0
ip address <ip address> <subnet mask>
dialer-group 1
isdn spid1 <SPID> <LDN>
isdn spid2 <SPID> <LDN>
dialer wait-for-carrier time 15
dialer idle-timeout300
encapsulation ppp
ppp authentication chap
dialer map ip <destination ip address> name <remote router name> <ISDN connection number>

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