Network Speeds Nominal
speed
w/o SONET overhead TCP/IP over ATM
PPP
over
SONET
Cellphone to 38.4 kbps  
V.34, DS0, T0 56/64 kbps modem, ISDN
Cable, DSL ~500 kbps
Bluetooth to 1 Mbps ~30 feet
T1 (DS1) 1.5 Mbps
E1 2 Mbps "Euro T1"
2 GHz UMTS 2 Mbps  
Ethernet 10 Mbps
2 GHz 802.11b 11 Mbps Wireless ethernet
T3 (DS3) 45 Mbps Past net backbone
OC-1 52 Mbps Slowest fibre, not used
5 GHz 802.11a 54+ Mbps

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Fast ethernet 100 Mbps
OC-3 155 Mbps 150 120 135
OC-12 622 Mbps 600 470 540 Present net backbone
Gigabit ethernet 1 Gbps Telseon, Yipes
HDTV 1.2 Gbps Uncompressed video
OC-48 2.5 Gbps 2.4 1.9 2.2 Telco backbone
OC-192 10 Gbps 9.6 7.5 8.7 Popular, e.g. Qwest
Fast gigabit ethernet 10 Gbps
OC-48 with WDM 40 Gbps Wave division multiplexed
OC-768 40 Gbps  
OC-3072 160 Gbps  
OC-768 w DWDM 6.4 Tbps e.g. Enkido
DWDM 10 Tbps In development
Fibre 75 Tbps Fibre capacity
Basic speeds:
kbps: Kilo bits per second  1,000 bps 
Mbps:  Mega bits per second 1,000,000 bps
Gbps: Giga bits per second 1,000,000,000 bps
Tbps: Tera bits per second 1,000,000,000,000 bps
Pbps: Peta bits per second 1,000,000,000,000,000 bps
Ebps: Exa  bits per second 1,000,000,000,000,000,000 bps

Wave Division Multiplexing (WDM): using different optical wavelengths, the fibre bandwidth can be increased by a factor of about 16. "Narrowband dinosaurs" are deploying WDM since it is less expensive than laying more fibre.

Dense Wave Division Multiplexing (DWDM) uses high-Q laser photons with single lambda bandwidth, limited only by the uncertainty principle discovered by Werner Heisenberg, allowing up to 10,000 adjacent channels within the amplifier gain!

From WH Networks