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What does this mean ?

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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Hayes V92 PC Card - Silver

Hayes V92 PC Card - Silver

Hayes V92 PC Card - Silver

Amazon UK
£34.04
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7 Port Broadband Cable Dsl Router Virgin Media Modem Uk

7 Port Broadband Cable Dsl Router Virgin Media Modem Uk

eBay.co.uk
£11.50
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Marks & Spencer M&S 3m High Speed ADSL & Broadband Modem Cable

Marks & Spencer M&S 3m High Speed ADSL & Broadband Modem Cable

3 metre length RJ11 plugs For ADSL and broadband modems M&S is a member of the WEEE Distributor Take Back Scheme. Recycling your electronic waste has never been easier! Click here for more information This product is not available for international delivery. Find out more M&S is a member of the WEEE Distribut

Marks and Spencer
£5.00
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Dialogic Vhsi V.24 Modem Cable

Dialogic Vhsi V.24 Modem Cable

Dialogic VHSI V.24 Modem Cable

Amazon Marketplace
£91.34
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Netgear DM111P ADSL2 + Ethernet Modem

Netgear DM111P ADSL2 + Ethernet Modem

Netgear DM111P ADSL2 + Ethernet Modem

Novatech Direct Ltd.
£34.98
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Sweex - ADSL 2/2+ Modem/Router Annex A

Sweex - ADSL 2/2+ Modem/Router Annex A

7dayshop.com
£15.99
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Zoom Hayes Zoom V.92 PC Card

Zoom Hayes Zoom V.92 PC Card

2 years Outperforms V90 modems Conforms to new ITU V92 & V44 standards Faster Web browsing Faster upload speeds Faster connect speeds Take phone calls while online Compatible with V90 On-board Controller and Digital Signal

Amazon UK
£37.59
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Zoom World Approved Pci Express V.92/v.44 Modem

Zoom World Approved Pci Express V.92/v.44 Modem

The Model 3035 PCI Express Modem is an internal faxmodem which connects to a Windows computer through a PCI Express slot. The Model 3035 is a single lane (x1) PCI Express card, and will fit into any available PCI Express slot regardless of the lane size. The Model 3035 has complete regulatory compliance in 70

Amazon UK
£15.99
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US Robotics 56K Pci Faxmodem V.92

US Robotics 56K Pci Faxmodem V.92

#br# The U#br#S#br# Robotics 56K PCI Faxmodem utilizes the processing power of your home computer to make sending / checking e-mail and surfing the Web easy#br# Update your home computer to surf the We

Amazon UK
£16.92
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Zoom Hayes Zoom V.90 USB Modem (MAC)

Zoom Hayes Zoom V.90 USB Modem (MAC)

Zoom V.90 USB Modem (MAC)

Amazon UK
£37.59
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Sweex MO128 ISDN Modem 128k PCI

Sweex MO128 ISDN Modem 128k PCI

Sweex MO128 ISDN Modem 128k PCI

Amazon UK
£15.99
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Zoom Hayes Zoom ADSL Ethernet Bridge

Zoom Hayes Zoom ADSL Ethernet Bridge

Zoom ADSL Ethernet Bridge

Amazon UK
£29.36
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7 Port Broadband Router For Virgin Media Telewest Ntl

7 Port Broadband Router For Virgin Media Telewest Ntl

eBay.co.uk
£11.52
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4 Port Broadband Cable Dsl Router Virgin Media Modem Uk

4 Port Broadband Cable Dsl Router Virgin Media Modem Uk

eBay.co.uk
£29.50
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BT ADSL MF50 Broadband Microfilter

BT ADSL MF50 Broadband Microfilter

BT ADSL MF50 Broadband Microfilter

Amazon Marketplace
£5.29
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