Saturday, January 17, 2015

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Wan Technology (T1, E1 and DSL)


            T1 E1 T3 and E3 Circuit

             Lease Line: - Typically a point-to-point connection that interconnects two sites and provide dedicated bandwidth to the subscribers


 T1 Characteristics
Ø  Originally Designed for Telephone Networks

 Digital Circuits
Ø  T1s and E1s Popular in North America and Japan
Ø  E1s and E3s Popular in Outside of North America and Japan
Ø  Terminate on Channel Service Unit/Data Service Unit (CSU/DSU)
Ø  A Layer 2 Protocol (e.g. PPP) run over a circuit


T1
E1
T3
E3
Bandwidth
1.544 Mbps
2.048 Mbps
44.7 Mbps
34.4 Mbps


                                                            


                                                                       DSL


Ø  Digital Subscriber line (DSL):- a Collection of broadband technology (e.g. ADSL SDSL and VDSL) that uses telephone line to Data Transmission
Ø  Asymmetric Digital Subscriber Line (ADSL) :- a type of DSL technology used in Home environments  
                               Asynchronous Transfer Mode (ATM):- Sends data in fixed-length cells (53 Byte of cells with 48 bytes of payload and 5 Byte of header), as supposed to variable length frames 



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