Figure 7-4: Leased Line Speeds, Continued CEPT Hierarchy Line Speed Typical Transmission Medium 64 kbps 64 kbps 2-Pair Data-Grade UTP E1 2.048 Mbps 2-Pair Data-Grade UTP E3 34.368 Mbps optical Fiber In Europe, most countries use the CEPT hierarchy E1 lines are slightly faster than T1 lines E3 lines are slightly slower than T3 lines 7-16
7-16 Figure 7-4: Leased Line Speeds, Continued Line Speed Typical Transmission Medium E3 34.368 Mbps Optical Fiber 64 kbps 64 kbps 2-Pair Data-Grade UTP E1 2.048 Mbps 2-Pair Data-Grade UTP CEPT Hierarchy In Europe, most countries use the CEPT hierarchy E1 lines are slightly faster than T1 lines E3 lines are slightly slower than T3 lines
I Figure 7-4: Leased Line Speeds, Continued SONET/SDH Speeds Line Speed(Mbps) Typical Transmission Medium OC3/STM1 155.52 Optical Fiber OC 12/STM4 622.08 Optical Fiber OC48/STM16 2,488. 32Optical Fiber OC 192/STM64 9, 953.28 Optical Fiber OC768/STM256 39, 813.12 Optical Fiber For speeds above 50 Mbps, the world uses one technology Called soneT in the United States, sdh in Europe SONET speeds measured in OC numbers, SDH in STM numbers Speeds are multiples of 51. 84 Mbps Used mostly by carriers
7-17 Figure 7-4: Leased Line Speeds, Continued Line Speed (Mbps) Typical Transmission Medium OC3/STM1 155.52 Optical Fiber OC12/STM4 622.08 Optical Fiber SONET/SDH Speeds OC48/STM16 2,488.32 Optical Fiber OC192/STM64 9,953.28 Optical Fiber OC768/STM256 39,813.12 Optical Fiber For speeds above 50 Mbps, the world uses one technology Called SONET in the United States, SDH in Europe SONET speeds measured in OC numbers, SDH in STM numbers Speeds are multiples of 51.84 Mbps Used mostly by carriers
Figure 7-5: Business-Class Symmetric Digital Subscriber Line(DsL) Services HDSL HDSL2 SHDSL Uses Existing 1-Pair Voice-Grade Yes Yes es UTP Telephone Access line to Customer Premises? Downstream Throughput 768 kbps 1.544 Mbps 384 kbps 2.3 Mbps Upstream Throughput 768 kbps 1.544 Mbps 384 kbps 2.3 Mbps 'By definition DSL alw6aGUP火☆ Many firms use HDSL and HdsL2 lines instead of T1 and fractional T1 speeds 7-18
7-18 Figure 7-5: Business-Class Symmetric Digital Subscriber Line (DSL) Services HDSL HDSL2 SHDSL Uses Existing 1-Pair Voice-Grade UTP Telephone Access Line to Customer Premises?* Yes* Yes* Yes* Downstream Throughput 768 kbps 1.544 Mbps 384 kbps – 2.3 Mbps Upstream Throughput 768 kbps 1.544 Mbps 384 kbps – 2.3 Mbps *By definition, DSL always uses 1-pair VG UTP Many firms use HDSL and HDSL2 lines instead of T1 and fractional T1 speeds
Figure 7-5: Business-Class Symmetric Digital Subscriber Line(DsL) Services HDSL HDSL2 SHDSL arget market Businesses Businesses Businesses Symmetrical Throughput? Yes Yes Yes QoS Throughput Guarantees? es Yes Yes Businesses need symmetrical throughput and Qos 7-19
7-19 Figure 7-5: Business-Class Symmetric Digital Subscriber Line (DSL) Services HDSL HDSL2 SHDSL Symmetrical Throughput? Yes Yes Yes Target Market Businesses Businesses Businesses QoS Throughput Guarantees? Yes Yes Yes Businesses need symmetrical throughput and QoS
Public switched data Networks(PsDNs)
Public Switched Data Networks (PSDNs)