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Modem Form Factor
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Your choices are...
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Internal
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An internal access point is a computer card that is attached to the computer through a slot. They are implemented, among others, as PCI, ISA, or PC cards (PCMCIA) in desktop computers, in notebook or palmtop computers, or integrated within hand-held computers.
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External
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An external modem is a module that is connected to the system by means of a physical port.
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Bus / Interface Type:
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Your choices are...
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Type II Card
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Type II card dimensions are 54mm x 85.4mm and may be up to 5.5 mm thick. Common uses of these cards: I/O devices such as data / fax modems, LAN adapter, non-rotating mass storage devices, etc.
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Type III Card
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Type III card dimensions are 54mm x 85.4mm and may be up to 10.5 mm thick.
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CardBus
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A card bus is a PC card with 32 bits of address and data. It runs at 33 MHz.
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ISA
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Industry standard architecture (ISA) buses can handle 16-bit data transfers at a clock speed of 8 MHz. They are also capable of handling memory under 16 MB. Extended ISA (EISA) is an enhanced version of the ISA bus. EISA buses run at 8 MHz, are capable of 32-bit data transfers, and can access all memory in the system.
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PCI
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Peripheral component interconnect (PCI) is a local bus system designed for high-end computer systems. PCI buses transfer 32 or 64 bits of data at a clock speed of 33 MHz. They also support 3 to 5 critical peripherals, which are either integrated directly onto the motherboard or added via expansion cards. PCI buses fully support cards that were developed for standard I/O buses.
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IEEE 1394 (FireWire )
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IEEE 1394 or FireWire® is an interface standard adopted by the Institute of Electrical and Electronics Engineers (IEEE) for very fast digital data transfers such as streaming video. IEEE 1394 connectors are used to transmit and receive data among FireWire devices, and are designed to replace external high-speed peripheral connections to personal computers, including hard disks, CD-ROMs, DVDs, graphics cards, high-speed scanners, direct video, monitors, etc. Tiny, robust FireWire connectors will also become important parts of home entertainment, communication, and appliance networks. FireWire is a registered trademark of Apple Computer, Inc.
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MIC
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A Medium Interface Connector (MIC) is a duplex fiber optic connector used with Fiber Distributed Data Interface (FDDI) networks.
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RJ-45
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RJ-45 connectors look a bit like a standard phone connector but are twice as wide (with eight wires). RJ-45s are used for connecting computers to local area networks (LANs), or for phones that connect to a number of lines.
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SC
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SC fiber optic connectors have a 2.5mm ferrule, push-pull latching mechanism, and the ability to be snapped together to form duplex and multifiber connectors. SC connectors are the preferred fiber optic cable for premises cabling, and are recommended by the TIA / EIA-568-A Standard for structured cabling. Used with Ethernet 100Base-FX and 1000Base-LX / SX fiber optic media systems.
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ISDN BRI S/T Interface
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The S/T interface is the connector on the ISDN modem where other ISDN devices connect in order to communicate over ISDN.
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ISDN BRI U Interface
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ISDN devices must have a terminator (called NT1 terminator) that is placed between the ISDN device and the wall jack. The U interface is the connector that connects NT1 terminated ISDN devices to the telephone company's ISDN wall jack. Many ISDN devices have a U interface, so they can be connected directly to the wall jack.
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Serial Ports (RS232, RS422, RS485)
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Serial Ports (Asynchronous Serial Interface): A system-to-system communication interface. Data is sent over a single wire (serial). Transmission is asynchronous because no synchronization or clocking signal is present.
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USB
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Universal serial bus (USB) is a 4-wire, 12-Mbps serial bus for low-to-medium speed peripheral device connections to personal computers (PC), including keyboards, mice, modems, printers, joysticks, audio functions, monitor controls, etc. The USB design is standardized by the USB Implementers Forum (USBIF), an organization that includes leading companies from the computer and electronics industries. The current USB specification is USB 2.0, which supports data transfer rates of up to 480 Mbps.
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PLC Slot Mount
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The device has an interface where a Programmable Logic Controller (PLC) can be connected for remote applications.
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ST
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ST is a designation for the "straight tip" connector developed by AT&T. This fiber optic connector features a physically contacting non-rotating 2.5mm ferrule design and bayonet connector-to-adapter mating. It is used with Ethernet 10Base-FL and FIORL links.
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Other
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Other unlisted interfaces.
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Frequency Band:
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Your choices are...
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900 MHz
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The 900 MHz band comprises the 902 - 928 MHz range. It is one of the unlicensed Industrial, Scientific and Medical (ISM) bands. Users are free to access them without having to register with any regulating organization (FCC for North America, ETSI for Europe, etc.). In North America the maximum transmission power allowed is 1 W.
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2.4 GHz
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The 2.4 GHz band comprises the 2.40000 - 2.4835 GHz range. It is one of the unlicensed Industrial, Scientific and Medical (ISM) bands. Users are free to access them without having to register with any regulating organization (FCC for North America, ETSI for Europe, etc.). In North America the maximum transmission power allowed is 1 W. 802.11b and 802.11g operate in this frequency band.
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5 GHz
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European Telecommunications Standards Institute (ETSI) was the first to open the 5 GHz unlicensed bands, and at present are dedicated to HiperLan (5.2 GHz band), HiperLan II (5.4 GHz). In North America the FCC has allocated the band between 5.2 and 5.8 GHz to the Unlicensed National Information Infrastructure (UNII). 802.11a also operates in this frequency band.
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23 GHz
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Microwave radio system transmitting in the frequency band of 21.2 to 23.6 GHz.
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VHF
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Very High Frequency (VHF) radio band: 30 MHz to 300 MHz.
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UHF
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Ultra High Frequency (UHF) radio band: 300 MHz to 3000 MHz.
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Other
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Other unlisted frequency bands.
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Radio Technique:
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Your choices are...
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Direct Sequence Spread Spectrum
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Spread spectrum is a technique that is used to reduce the impact of localized frequency interferences. To achieve this, it uses more bandwidth than the system needs. There are two main spread spectrum modalities: direct sequence and frequency hopping. The principle of direct sequence spreads the signal on a larger band by multiplexing it with a code (signature) to minimize localized interference and noise. The system works over a large band. To spread the signal, each bit is modulated by a code.
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Frequency Hopping Spread Spectrum
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Spread spectrum is a technique that is used to reduce the impact of localized frequency interferences. To achieve this, it uses more bandwidth than the system needs. There are two main spread spectrum modalities: direct sequence and frequency hopping. Frequency hopping uses a technique where the signal walks through a set of narrow channels in sequence. The transmission frequency band is divided in certain number of channels, and periodically the system hop to a new channel, following a predetermined cyclic hopping pattern. The system avoids interference by never staying in the same channel a long period of time.
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Other
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Other unlisted radio techniques such as infrared, narrowband, etc.
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Network Type
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Your choices are...
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Dial-up
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Communication method where a device is connected to a network via a modem and a public telephone network.
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Ethernet
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Local Area Network (LAN) architecture was developed by Xerox Corporation in cooperation with Digital Equipment Corporation (DEC) and Intel in 1976.
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AMPS
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Advanced Mobile Phone System (AMPS) is the original cellular system in United States. It uses an analog radio link.
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CDPD
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Cellular Digital Packet Data (CDPD) is a data transmission technology developed for use on cellular phone frequencies. It transmits data in packets at frequencies between 800 Mhz and 900 MHz.
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GSM
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Global System for Mobile (GSM) Communications is a digital cellular system that uses narrowband Time Division Multiple Access (TDMA) technology. It allows eight simultaneous calls on the same radio frequency.
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ISDN
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Integrated Services Digital Networks (ISDN) is an international standard used to send data, video and voice over digital telephone lines or normal telephone wires. ISDN support data transfer rates of 64 Kbps. Normally the telephone company installs two lines called B channels; both can be used to send data to achieve data rates of 128 Kbps. A broadband version of ISDN, called B-ISDN, supports data rates of 1.5 Mbps over fiber optic cables.
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PAN
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Personal Area Network (PAN) is an IBM technology that allows individuals to exchange data using a simple technology.
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PCS
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Personal Communications Service (PCS) describes a set of digital cellular technologies being deployed in the U.S. PCS works over CDMA (also called IS-95), GSM and North American TDMA (also called IS-136) air interfaces.
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GPRS
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General Packet Radio Service (GPRS) is a standard for wireless communications, which runs at speeds up to 115 kilobits per second.
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Other
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Other unlisted network types.
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