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Form Factor:

Modem Type:

Bus / Interface Type:

Modem Technology:

Features:

Help with Network Modems specifications:

General Specifications
   Form Factor       
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   Internal       An internal modem is a computer card that is attached to the computer through a slot. 
   External       An external modem is a module that is connected to the system by means of a physical port. 
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   Modem Type:       
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   Telephone (PSTN) Modem       Public Switched Telephone Network (PSTN) refers to the international telephone system based on copper wires carrying analog voice data. This is in contrast to newer telephone networks based on digital technologies, such as ISDN or FDDI. 
   ISDN Modem       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. 
   xDSL Modem       Digital Subscriber Lines (xDSL) is a set of technologies that use sophisticated modulation schemes to send data onto copper wires. They are called the last-mile technologies because they are used only for connections from a telephone switching station to a home or office, not between switching stations.  xDSL is similar to ISDN.  Both operate over existing telephone wires, and both need a short connection (less than 20 feet) to a central telephone office. There are several types of xDSL technologies in use today such as ADSL, SDSL, HDSL:
  • ADSL - Asynchronous DSL: Supports data transfer rates of up to 9 Mbps when receiving data (upstream), and up to 640 kbps when sending data (downstream).
  • SDSL - Symmetric DSL: Supports data transfer rate of up to 3 Mbps in both direction, upstream and downstream.
  • HDSL - High data-rate DSL.
 
   Fiber Optic Modem       A modem that is used in optical systems. 
   Other       Other unlisted fax / modem types. 
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   Bus / Interface Type:       
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   Type II Card       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. 
   CardBus       A card bus is a PC card with 32 bits of address and data. It runs at 33 MHz. 
   ISA       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. 
   PCI       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. 
   RJ-45       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. 
   ISDN BRI S/T Interface       The S/T interface is the connector on the ISDN modem where other ISDN devices connect in order to communicate over ISDN. 
   Serial Ports (RS232, RS422, RS485)       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. 
   ST       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. Used with Ethernet 10Base-FL and FIORL links. 
   USB       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. 
   Other       Other unlisted interfaces. 
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   Modem Technology:       
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   V.120       V.120 is a standard for encapsulating asynchronous data communications traffic into ISDN data streams (which are synchronous). This enables two devices (typically PCs) to communicate over an ISDN connection, using their standard asynchronous-only COM ports (an external V.120 adapter is then used) or an internal board that plugs into the PC's bus (the board then includes the COM port and V.120 adapter functionality). 
   V.92       V.92 is a new proposed dial-up modem standard that is being worked on by the International Telecommunications Union (ITU). The proposed standard provides for an increase in upload speeds, quicker connect times and a modem-on-hold feature that allows the modem to work in conjunction with call waiting provided by the phone company. V.92 doesn’t increase the download speed over V.90, but it does increase the maximum upload speed to 48 kbps. This is a 30% increase over the 33.6 kbps attainable by today’s V.90 modems. 
   V.90       V.90 is the International Telecommunications Union (ITU-T) standard serial line protocol for modems that allows download speeds of up to 56 kbps and upload speeds of 33.6 kbps.  The V.90 standard reconciles two competing standards, X2 and K56Flex. 
   V.90 / K56Flex       K56Flex is an open standard for modems developed by Lucent and Rockwell. The ITU-T V.90 standard has superceded this protocol. 
   V.34       V.34 is an ITU-T standard serial line protocol for modems operating at data signaling rate of up to 28,800 bit/sec. 
   V.34+       V.34 is an ITU-T standard serial line protocol for modems operating at data signaling rate of up to 33,600 bit/sec. 
   Other       Other unlisted modem technologies. 
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   Features       
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   Full Duplex Transmission?       Full duplex devices can transmit and receive at the same time. 
   Antenna Included?       An antenna may or may not be an integral part of the modem. 
   RF Connector?       Some radio modems include an RF connector that can be used to connect an antenna, or any other suitable RF device.  Type of connectors: BNC, TNC, N, etc. 
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