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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