8/13/2019 Day11 Isdn

1/15

1

8/13/2019 Day11 Isdn

2/15

2

WAN Connection Types

There are three types of Wan Connectivity :

Dedicated Lines

Circuit Switching

Packet Switching

8/13/2019 Day11 Isdn

3/15

3

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

8/13/2019 Day11 Isdn

4/15

4

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)

8/13/2019 Day11 Isdn

5/15

5

Packet Switching

Used for medium to longer distances and

for longer connectivity.

Bandwidth is shared

eg: Frame-Relay

8/13/2019 Day11 Isdn

6/15

6

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

8/13/2019 Day11 Isdn

7/15

8/13/2019 Day11 Isdn

8/15

8

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.

8/13/2019 Day11 Isdn

9/15

9

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.

8/13/2019 Day11 Isdn

10/15

10

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

8/13/2019 Day11 Isdn

11/15

11

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

8/13/2019 Day11 Isdn

12/15

12

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

8/13/2019 Day11 Isdn

13/15

13

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

8/13/2019 Day11 Isdn

14/15

14

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

8/13/2019 Day11 Isdn

15/15

15

ISDN for Internet Configuration

BRI interface configurations

Authentication

Dialer commands

ISDN Switch Type

NAT

Access-List

Routing Protocol Misc. Commands

Troubleshooting commands