The type of codec (Modulation Type) 1) to convert the frequency of a wave (Frequency Modulation). The conversion of 2) waves (Amplitude Modulation). 3-phase transformation of waves) (Phase Modulation). The standard modem is a modem standard portions of ITU-T are as follows:-the standard is V.22 duplex modem. The data rate is at 1200 bps using the public telephone system and the system of double rent V.22 bis is derived from the 2400 bps can be sent, V.22 uses the technique in the frequency-V.32 modem 9600 bps is the speed at which this type of technique in the QAM transmission encoding at a 4 bit-v.32 bis updates coming from the transmission up to 14000 V.32 bps using the technique in the QAM encoded-info to V.90 be 53000 33600 bps bps can send data. At present, the modem has a maximum speed of 100.0-1 000.0 kbps can be sent, but now there is a new type of production, the modem can send data at the level of ADSL is still used, for example, a telephone line Mbps intact. 1.3 ISDN (Integrated Services Digital Network) 1.4 DSL (Digital Subscriber Line) 1.5 cable modem (Cable Modem) 2. network equipment such as Switch, Router, CSU/DSU (Channel Service Unit/Data Unit Device) is a device used to serve in the Administration about the traffic on the network. Use for counter signals in order to transport away with good performance. A network device, such as a Hub, switch, Router, CSU/DSU, etc.--Tangmo1728 14:17, November 23 2007 (ICT) 3. the address management system (Internet work Addressing). 4. Protocol Routing (Routing Protocol) lachat (Wireless Wan network of 2549 (2006)-line.)
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