Conclusion On DSL Modems - Modem stands for Modulator-Demodulator.Sender performs modulation which means converting analog data into digital data while receiver performs demodulation which refers to converting digital data into analog one.Before choosing a good modem some issues need to be cleared.
I am thinking of changing my old DSL modem supplied by my ISP,because last month I took a fast internet connection & the modem I think is not compatible with it.Is it so that modems incite malware,trojan horses & viruses?I wanted to know.What do you suggest me?Should I stick to an old DSL or purchase a new one.
Some important points to be kept in mind about modem
- At the sender’s side,modem take electrical signals as input & converts them into sound or audio signals.At the receiver’s side,sound or audio signals are converted back to electrical signals.
- Since modems are directly connected to an internet so they cannot stop viruses, malware & any threat from entering inside our system.
- Modems come in various flavours of ADSL modems,cable modems & broadband modems.
Characteristics of ADSL modem
- ADSL stands for Asymmetric Digital Subscriber Line the transfers data faster over copper telephone lines than the conventional modem does.
- ADSL present some issues regarding installation,proper installation of frequency filters is necessary at the customer premises.This is needed to avoid interruption in the voice service.
- Most ADSL modems come attached with microfilters which can be easily attached with the subscriber’s phone & hence avoiding the rewiring at the customer premises.
- ADSL modem operates within the geographic range of 2 to 3 miles.
- ADSL modems supports downstream data rates are 1.5 to 9 Mbps while its upstream datarates are 16 to 640 Kbps.
Characteristics of Cable modems
- Cable modem is a technology used to work with cable TV lines.
- One technical difficulty with Cable modems is that, Cable TV system has been designed to broadcast signals only in one direction while internet requires 2 way transfer-upstream & downstream.
- This modem provides a data rate upto 2 Mbps.
- Cable modem presents 2 times faster download speed in comparision to 1.5 Mbps ADSL modems.While the upload stream of cable modem is same as ADSL modem.
- Cable modem offers cheaper rates at the set up price ranging from $50 to $100 while DSL has higher set up price of $150.Then monthly subscription prices of DSL modem are $5 to $10 more than $40 to $50 price of cable modem.
- Service providers generally provide security features in the hardware of the cable modem.While DSL modem provide better security with features installed in the hardware & software.
How you can use modem in your computer?
Modems can be used in your computer system through many types.Some of the ways are through USB,through ethernet & through a switch.
- USB Modem –
- It refers to a small portable USB device connected to a computer via USB.It is quite similar to USB flash drive & it weighs only 25 grams.
- One end of USB modem is connected to USB interface while the other is connected to RJ-11 connector to connect the telephone line.
- USB modem needs no power supply & can be easily connected to any USB port or your laptop & desktops.
- Ethernet Modem –
- It is a device which uses ethernet technology for connecting computer to an internet.
- These modems are more reliable than USB modems in networking.
- These don’t require the installation of device drivers while USB modem does.
- It provides higher data rates of 100 to 1000 Mbps.
- These can be reached to longer distances as compared to USB modems.
- Switch Modem –
- ADSL modems can also be connected to switch & many computers can be connected to this.
- For this enable the DHCP property from the modem.Now,remove RJ45 cable from the modem & connect it to switch.After that connect the computers to switch.
Choose to buy a new modem or use one provided by an ISP
- If you wish to use a modem supplied by your ISP then it has a plus point that it comes with a guarantee.If anything changes or damages,then ISP will have to replace it.This is not the case with buying a new modem.
- If you are attempting to buy a modem then it must be compatible with your ISP.Suppose if your ISP switches to different technology,then your new modem relaying on old technology will be unable to use new services.