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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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D-Link DEM-310GT 1-port mini-GBIC LX Single-mode...

The DEM-310GT is a high performance 1310nm multimode/Singlemode SFP (mini-GBIC) transceiver. Support

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Modems

D-Link DEM-310GT 1-port mini-GBIC LX Single-mode...

Cisco Cisco Catalyst 6500 Series Gigabit Ethernet...

3COM Switch 4500G 1-Port 10-Gigabit Module (XFP)...

David Wilson, Jasjit S. Suri And Swamy Laximinaray...

Netgear 16-port 10/100 Switch JFS516UK

HP Procurve Switch XL 4 Port Mini-GBIC Module for...

3COM Gigabit Switch 8 3CGSU08-UK

3COM Baseline Switch 2126-G 3C16472-UK

3COM Switch 4500G 2-Port 10 Gigabit Module 3C17767

3guk Huawei E160G Mobile Broadband 24GB PrePay 18091

Cisco Systems Catalyst 3560 48 10/100/1000T + 4 SFP...

William I. Robinson Promoting Polyarchy:...

IBM Nortel Layer 2/3 Copper GbE Switch Module for...

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

From Amazon Marketplace: BT Voyager 1060 Laptop Wireless Card

Thomson SpeedTouch 330

US Robotics 56k Modem

Netgear DG834

US Robotics 56K

Intel Xircom CardBus CBM56WG

US Robotics 56K Faxmodem