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Telecommunications & The Internet Basic Telecom Model
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| bet | 1/7 | | Sana | 02.12.2023 | | Hajmi | 298,5 Kb. | | #109660 |
Bog'liq Network-Internet Basic Telecom Model Typical Home Telecom Model Channels - Twisted wire (twisted pair)
- Coaxial Cable
- Fiber Optics
- Microwave
- Newer Wireless
Twisted Pair - Low cost
- easy to work with
- installed infrastructure
- crosstalk
- 300bps to 100Mbps
- “This modem is 56Kbps capable. However, current regulations limit download speeds to 53Kbps,” the fine print from a typical modem advertisement.
DSL - Uses existing twisted pair
- 256Kbps to 40Mbps
- Loop length max about 18,000 ft.
- More correctly ADSL (Asymmetric Digital Subscriber Line) with download speeds different from upload speeds.
Coaxial Cable - More expensive
- harder to work with
- not as extensive an existing infrastructure
- cable TV companies are changing this
- 56Kbps to 550Mbps
Fiber Optics - Very expensive
- difficult to work with
- existing infrastructure limit to backbones
- 500Kbps to 30Gbps
Microwave - Not as expensive as land lines
- Limited to line of site, (towers)
- reasonable infrastructure
- Satellite bounce, increases expense
- geo-synchronous (22,000 miles)
- low earth orbit (cheaper, lower power)
- 256Kbps to 100Mbps
Newer Wireless - Cellular
- mobile data networks
- personal communications services (PCS)
- note: pagers & PDAs are not channels, they would be nodes on one end of a channel
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