Day11 Isdn

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    WAN Connection Types

    There are three types of Wan Connectivity :

    Dedicated Lines

    Circuit Switching

    Packet Switching

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    Dedicated Lines

    Used for shorter to medium distances and

    for longer connectivity.

    Private line

    Bandwidth is fixed

    Line is 24hrs up

    If you use it or if you dont use it you have to pay

    money

    eg: Leased Lines

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    Circuit Switching

    Used for medium to longer distances and

    for shorter connectivity.

    Bandwidth is fixed

    Whatever you use you have to pay money for it.

    (Billing Depends upon the Usage)

    eg: ISDN , PSTN (Dial Up connections)

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    Packet Switching

    Used for medium to longer distances and

    for longer connectivity.

    Bandwidth is shared

    eg: Frame-Relay

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    Point to Point

    Protocol Open Standard Protocol

    (works with same anddifferent company

    Routers i.e. Cisco

    Nortel, Cisco Multicom. Supports

    Authentication Supports Compression

    High level Data link

    Control Vendor proprietary

    Protocol (works withsame company Router

    only, i.e. Cisco-Cisco,Nortel-Nortel, etc.)

    No Support forAuthentication

    No Support for

    Commpression

    PPP HDLC

    Encapsulation

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    Public Switched Telephone Network

    Analog Signal

    Maximum Speed for 33 to 40 Kbps

    Call Establishment is Slower (minimum 1 minute)

    Terminated & PSTN Switch at Exchange

    Supports Single services at a time.

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    Integrated Services Digital Network

    Digital Signal

    Minimum Speed for 128 Kbps

    Call Establishment is faster (within 2 sec)

    Terminated & ISDN Switch at Exchange

    Supports Multiple services at a time.

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    ISDN Types

    BRI Basic Rate Interface

    - (2B + 1D) channels

    - Each channel 64 kbps

    - B channel used for data transmission- D Channel used for signaling(16kbps)

    - (2* 64) + (1 * 16) = 144kbps

    - B standards for Bearer

    - D standards for Delta

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    ISDN Types

    PRI Primary Rate Interface

    2 Standards :

    European Standard (E1)

    - 30B + 1D channels- (30*64) + (1*64) = 2.048Mbps

    US Standard (T1)

    - 23B + 1D channels

    - (23*64) + ( 1*64) = 1.544Mbps

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    ISDN Connectivity

    E0192.168.1.150

    LAN - 192.168.1.0/24

    TA

    BRI0

    ISDNSWITCH

    ISDN ServiceProvider Network

    S/T Cable

    NT1

    Fax

    Phone

    PC

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    Dial on Demand Routing

    Connection is Automated connection is

    established when ever a request comes to the router

    and disconnection is done using Idle-Timeout

    All these configurations are to be made on the router

    Interesting Traffic is identified using Dialer List

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    Network Address Translation

    Translates Private addresses to Public

    and Public addresses to Private.

    Allows Communication from the private world to the

    public world and not vice versa.

    Used for internet sharing

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    ISDN for Internet Configuration

    BRI interface configurations

    Authentication

    Dialer commands

    ISDN Switch Type

    NAT

    Access-List

    Routing Protocol Misc. Commands

    Troubleshooting commands

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