Semester 2 - Review
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WAN Technologies
Circuit Switched
POTS - Plain Old Telephone Service
Not computer data service - model design
ISDN - Integrated Services Digital Network
Data and Voice over same line. 128kb - 3Mb
Packet Switched
X.25
Extensive error correction, 2Mb
Frame Relay
More efficient than X.25, 56kbps - 384kbps with 44.7Mb max
Cell Switched
ATM - Asynchronous Transfer Mode
Similar to broadband ISDN, fixed length packets (53byte), 622Mb
SMDS - Switched Mulimegabit Data Service
Closely related to ATM, 44.7Mb
Dedicated Digital Services
T1/T3
T1 - 1.544MB, T3 - 44.7Mb
xDSL - Digital Subscriber Line
Speeds from 100kb - 51Mb depending on distance to phone company CO
VDSL - very high bit rate DSL
RADSL - Rate adaptive DSL
SONET - Synchronous Optical Network
OC-1 - 51.84Mb to OC-192 - 9.952Gb
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