Kbase P75307: Bandwidth Requirements and Ratings
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
05/04/2004 |
|
Status: Unverified
GOAL:
Bandwidth Requirements and Ratings
FIX:
Bandwidth is the information-carrying capacity of a communication channel. The channel may be analog or digital.
Analog transmissions such as telephone calls, AM and FM radio, and television are measured in cycles per second (hertz or Hz).
Digital transmissions are measured in bits per second. For digital systems, the terms "bandwidth" and "capacity" are often used interchangeably, and the actual transmission capabilities are referred to as the data transfer rate (or just data rate).
In the electromagnetic spectrum, sound waves occupy low ranges, while microwaves, visible light, ultraviolet, and X-rays occupy upper ranges.
Bandwidth requirements for various applications
Application Rate
Personal communications 300 to 9,600 bits/sec or higher
E-mail transmissions 2,400 to 9,600 bits/sec or higher
Remote control programs 9,600 bits/sec to 56 Kbits/sec
Digitized voice phone call 64,000 bits/sec
Database text query Up to 1 Mbit/sec
Digital audio 1 to 2 Mbits/sec
Access images 1 to 8 Mbits/sec
Compressed video 2 to 10 Mbits/sec
Medical transmissions Up to 50 Mbits/sec
Document imaging 10 to 100 Mbits/sec
Scientific imaging Up to 1 Gbit/sec
Full-motion video Up to 2 Gbits/sec
Transmission rates of various communication systems
Dial-up modem connection 1,200 bits/sec to 56 Kbits/sec
Serial port file transfers 2,000 bits/sec
ISDN (Integrated Services Digital
Network) 64 Kbits/sec or 128 Kbits/sec
Fractional T1 digital WAN link 64 Kbits/sec
Parallel port 300 Kbits/sec
DirecPC(satellite) Internet downloads 400 Kbits/sec
DSL (Digital Subscriber Line) 512 Kbits/sec to 8 Mbits/sec
Cable (CATV) modems 512 Kbits/sec to 10 Mbits/sec (or higher)
T1 digital WAN link 1.544 Mbits/sec
ARCNET LANs 2.5 or 20 Mbits/sec
Token ring LANs 4 or 16 Mbits/sec
Ethernet LANs 10, 100, 1,000 Mbits/sec
T3 digital WAN link 44.184 Mbits/sec
HSSI (High-Speed Serial Interface) 52 Mbits/sec
FDDI (Fiber Distributed Data
Interface) 100 Mbits/sec
Fibre Channel 1 Gbit/sec
Gigabit Ethernet 1 Gbit/sec
10GE (10 Gigabit Ethernet) 10 Gbits/sec
SONET (Synchronous Optical Network) 51.9 Mbits/sec to 2.5 Gbits/sec
Optical (lambda) networks
implementing DWDM Hundreds (or perhaps thousands) of lambdas per fiber, each running at 2.5 Gbits/sec