The type of signal conversion (Modulation Type)
1) frequency conversion of the wave (Frequency Modulation)
2) conversion of the wave (Amplitude. Modulation)
3) converting the phase of wave (Phase Modulation)
standard modem modem standards, some of the ITU-T are as follows: - V.22 standard duplex modem rate information in 1 200 BPs,, Use the public telephone system and the system with dual line rental V.22 bis updated from V.22 can send data, 2 400 BPS technique used in finding the frequency - V.32. The speed, 9This type 600 BPS modem technique used in encryption QAM send data at 4 bit - V.32 bis improve from V.32 send the data to the 14 000 BPs,, Technique used in encryption QAM - V.90 can receive data to 53 000, BPS can send data, 33 600 BPS
.The current modem is the maximum 100.0-1 000.0 Kbps, who can send. But now there is a new type production modem can transmit data in Mbps level such as ADSL still use the same phone
1.3 ISDN. (Integrated Services Digital Network)
1.4 DSL (Digital Subscriber Line)
1.5 cable modem (Cable Modem)
2. Network devices, such as,, Switch RouterCSU / DSU (Channel Device Unit / Data Service Unit) is a device that acts in the management of traffic on networks. Used for repeat signal. In order to send and receive data are far apart, with great efficiency, network devices, such as HubSwitch Router CSU / DSU, etc. - Tangmo1728 14: 17 23 November, 2007 (ICT)
3 management system address (Internet work Addressing)
4. Routing protocol. (Routing Protocol)
(wireless network system Wan. On - line 2549)
.
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