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Modem (from modulate and demodulate) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The goal is to produce a signal that can be transmitted easily and decoded to reproduce the original digital data. Modems can be used over any means of transmitting analog signals, from driven diodes to radio. Experiments have even been performed in the use of modems over the medium of two cans connected by a string.[citation needed]

The most familiar example is a voiceband modem that turns the digital '1s and 0s' of a personal computer into sounds that can be transmitted over the telephone lines of Plain Old Telephone Systems (POTS), and once received on the other side, converts those 1s and 0s back into a form used by a USB, Serial, or Network connection. Modems are generally classified by the amount of data they can send in a given time, normally measured in bits per second, or "bps".

Faster modems are used by Internet users every day, notably cable modems and ADSL modems. In telecommunications, "radio modems" transmit repeating frames of data at very high data rates over microwave radio links. Some microwave modems transmit more than a hundred million bits per second. Optical modems transmit data over optical fibers. Most intercontinental data links now use optical modems transmitting over undersea optical fibers. Optical modems routinely have data rates in excess of a billion (1x109) bits per second. Please note that one kilobit per second (kbit/s or kb/s or kbps) as used in this article means 1000 bits per second and not 1024 bits per second. For example, a 56k modem can transfer data at up to 56,000 bits per second over the phone line.
 

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Modems

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Zoom V3 Gv 4 Port Ethernet 1 Port USB + Voip Modem...

Zoom V3 Gv 4 Port Ethernet 1 Port USB + Voip Modem...

Zoom V3 Gv 4 Port Ethernet 1 Port USB + Voip Modem

 Misco
£58.74
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From Amazon Marketplace: BT Voyager 1060 Laptop Wireless Card

From Amazon Marketplace: BT Voyager 1060 Laptop Wireless Card

Postage and packaging costs are calculated according to the weight of your purchased item. Please check site for full details. Platforms: Windows

 Amazon Marketplace
£5.45
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Sweex 4 Port USB 2.0 PCI Card

Sweex 4 Port USB 2.0 PCI Card

EXPAND THE NUMBER OF USB CONNECTIONS ON YOUR PC CONNECT MULTIPLE USB DEVICES TO YOUR PC EASILY AND EFFORTLESSLY PROTECTION AGAINST OVERLOADING AND SHORT CIRCUITS FOR EACH PORT Contents of the package: 4 Port USB 2.0 PCI card CD-ROM with manual and drivers

 MX2.com
£8.99
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Zoom Adsl2/2+ Ethernet Bridge Modem 5615-72-00F

Zoom Adsl2/2+ Ethernet Bridge Modem 5615-72-00F

Zoom Adsl2/2+ Ethernet Bridge Modem

 Misco
£30.54
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From Amazon Marketplace: Zoom V92/V90 PCI 56k Modem (DUK)

From Amazon Marketplace: Zoom V92/V90 PCI 56k Modem (DUK)

Postage and packaging costs are calculated according to the weight of your purchased item. Please check site for full details. This modem makes it possible to connect to the Internet, to surf the web and to check your emails and faxes. Once connected to t

 Amazon Marketplace
£3.90
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From Amazon Marketplace: BT AOL ADSL USB Modem Voyager 105 Modem

From Amazon Marketplace: BT AOL ADSL USB Modem Voyager 105 Modem

Postage and packaging costs are calculated according to the weight of your purchased item. Please check site for full details.

 Amazon Marketplace
£7.99
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Zoom Hayes Accura V92 Serial External Modem...

Zoom Hayes Accura V92 Serial External Modem...

Hayes Accura V92 Serial External Modem

 Misco
£29.36
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Cisco Expansion module - Expansion Slot - ATM - E-3

Cisco Expansion module - Expansion Slot - ATM - E-3

The single port E3 ATM network module for the Cisco 2600 and 3600 Multiservice Access Routers provides a single ATM connection of 34Mbps for E3 using 75-ohm BNC connectors. The E3 ATM network modules supports ATM Forum compliant framing standard AAL5. ATM

 Amazon UK
£3409.53
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Cisco Cisco Firewall Services Module - ( v. 2.2(1)...

Cisco Cisco Firewall Services Module - ( v. 2.2(1)...

The Firewall Services Module (FWSM) is an integrated securitymodule for Cisco Catalyst 6500 Series switches and 7600 Seriesrouters that provides stateful Layer 7 filtering capabilities. TheSelf-Defending Network is Cisco Systems' long-term strategy

 Amazon UK
£7845.59
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Cisco PVDM PVDM/4 - Voice DSP module - 4 ports

Cisco PVDM PVDM/4 - Voice DSP module - 4 ports

Cisco Systems presents its new voice network module. Voice network modules convert telephone voice signals into a form that can be transmitted over an IP network. You need both a voice network module and a voice interface card for a voice connection. You

 Amazon UK
£196.41
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Zoom V.90 USB Modem 2985-72-00CF

Zoom V.90 USB Modem 2985-72-00CF

Zoom V.90 USB Modem

 Misco
£41.11
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3COM Baseline Switch 2250 Plus 3CBLSF50-UK

3COM Baseline Switch 2250 Plus 3CBLSF50-UK

The smart 3Com Baseline Switch 2250 Plus is a web-managed Layer 2 10/100 Ethernet switch. It offers

 Oyyy
£305.55
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D-Link Adsl2+ Ethernet Modem DSL-320B/UK

D-Link Adsl2+ Ethernet Modem DSL-320B/UK

D-Link Adsl2+ Ethernet Modem

 Misco
£29.36
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Zoom Hayes Accura V.92 Internal Software PCI Modem...

Zoom Hayes Accura V.92 Internal Software PCI Modem...

Hayes Accura V.92 Internal Software PCI Modem

 Misco
£11.74
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Cisco IOS IP/VOICE - Complete package - CD

Cisco IOS IP/VOICE - Complete package - CD

If you understand Cisco IOS software (the software that runs yourrouter) and you are experienced in configuring network devices youcan use the Cisco IOS command-line interface (CLI) to configureyour router.

 Amazon UK
£195.39
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