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History Of Cordless Phones

Cordless phones made its appearance during 1980. The earliest cordless phones that operated at a frequency of 27 MHz had certain problems. They faced some of the problems such as limited range, poor sound quality, noisy and static. Poor security is another problem they faced. Hence, people could easily intercept signals from another cordless phone because of the limited number of channels.

With an aim to improve such interference problem and reduce the power needed to run the cordless phones, the Federal Communications Commission (FCC) granted the frequency range of 47-49 MHz for cordless phones in 1986. Granting a greater frequency range allowed cordless phones to have less interference and need less power to run. But, still the cordless phones had the problems such as limited range and poor sound quality.

During 1994, different choices of cordless phones operating at the frequency range of 900 MHz were developed. In 1994, digital cordless phones were introduced. The digital signal transmission technology allowed the cordless phones to be more secure. This increased clarity and it also made it impossible for radio scanners to pick up this frequency for listening to other’s conversations. Thus the interference problem was almost solved.

In 1995, digital spread spectrum (DSS) technology was introduced for cordless phones. Digital Spread Spectrum served as a complete new way of sending the cordless phone signal from the base to the handset. The technology of digital spread spectrum enabled the digital information to spread in pieces over several frequencies between the receiver and the base, thereby making a complete solution for interference problem. Digital Spread Spectrum technology spreads the cordless phone signal 360 degrees so there were no dead spots and distance went up to half a mile. The digital spread spectrum technology was secure. The Cordless phones using such technology were expensive, and were available in limited choices.

Both digital cordless phones and digital spread spectrum (DSS) cordless phones were intended to increase the security of cordless phones and decrease unwanted eavesdropping by enabling the phone conversation to be digitally spread out. In 1998, the FCC granted the frequency range of 2.4 GHz for cordless phone use.

This frequency has widely increased the distance over which cordless phones can operate. Moreover, cordless phones operating at this frequency range had further increased security. Cordless phones had now reached their expected quality offering better clarity, maximum security and no noise. In 2003, the FCC granted the frequency range of 5.8 gigahertz, and till now this upward range is being used. In order to tighten security, FCC allowed manufacturers to make phones with frequencies of 2.4 GHz and 5.8 GHz.

Thus the technology in cordless phones has widely improved a lot in the past 20 years. It is really amazing that DSS cordless phone is available for less than $100 from the year 2000.

The FCC then granted the frequency range of 900 MHz for cordless phones in 1990. This higher frequency range allowed people to enjoy cordless phones having better qualities. The cordless phones operated at the frequency range of 900 MHz were found to be clearer and enjoyed the benefit of longer broadcast distance. The FCC also allowed 100 channels for these cordless phones. Though these cordless phones worked greatly, they were quite expensive, about $400 to $500. Frequency of 900 MHz was ideal to scrap out static and interference problems. They provided high quality sound output but were still prone to eavesdropping.

During 1994, different choices of cordless phones operating at the frequency range of 900 MHz were developed. In 1994, digital cordless phones were introduced. The digital signal transmission technology allowed the cordless phones to be more secure. This increased clarity and it also made it impossible for radio scanners to pick up this frequency for listening to other’s conversations. Thus the interference problem was almost solved.

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Panasonic KX-TG5561B-R 5.8 GHz DSS Expandable Cordless Phone $55.99 "Panasonic KX-TG5561B The Panasonic KX-TG5561B 5.8 GHz DSS expandable cordless phone with talking caller ID gives the crystal clear sound and perfect clarity on the phone calls. This phone features frequency-hopping digital spread spectrum transmission technology and has multiple indicators for Voice message waiting, new call, and line status indication. It has dual keypad with 89-channel auto scanning as well as it has 4-way conference call capability too. The KX-TG5561B is capable for voice mails and it has speakerphone for easy hadsfree talking . Other features includes caller ID, call waiting, intercom, volume and ringer control along with handset locator and many more. KX-TG5561B Features: Call Waiting, 89 Channels, 5.8GHz Cordless Phone, Cordless Phone, Digital FHSS Technology, Caller ID / Call Waiting, Voicemail Compatibility, Expandable Up To 8 Handsets, Wall Mountable, Speakerphone, Backlit LCD Display &amp Keypad, Lighted Keypad, 50 Station Phone Directory / Dialer, Up To 4-Way Conferencing, New Call Indicator, Message Waiting Indicator, 4 Selectable Ringtones, Volume Control, Adjustable Ringer Volume Control, Intercom, Easy Operation (Menu Driven), Handset Locator, Redial, Hold, Mute, Flash, Line Status Indicator"

Panasonic KX-TG5110M-R KX-TG5110M 5.8 GHz DSS Expandable Cordless Pho $194.95 "Panasonic KX-TG5110 The Panasonic KX-TG5110M 5.8 GHz DSS expandable cordless phone with answering system and dual handsets gives the crystal clear sound and perfect clarity on the phone calls. This phone is wireless network friendly and provides voice Prompts and time/day stamp. It features up to 5-way conferencing and dual keypads. It has digital answering system and the navigator key to keep you help updated with your calls. Other features includes tone remote operation, tollsaver, call screening, talking caller ID and clarity booster. KX-TG5110M is wall mountable and assures you a perfect clear voice every time you are on a call. KX-TG5110M Features: Call Waiting, 89 Channels, 5.8GHz Cordless Phone, Caller ID / Call Waiting, Expandable Up To 8 Handsets, 15 Minute Digital Answering System, Wall Mountable, 3-Line Backlit LCD Display, Backlit Keypad, Wireless Network Compatible, 50 Station Name / Number Caller ID Memory, 50 Station Phone Directory / Dialer, Up To 5-Way Conferencing, Volume Control, Handset Locator, Clarity Booster, Redial, Hold, Flash, Navigation Button, 2-Way Wireless Intercom / Speakerphone / Room Monitor, Low Battery / Out of Range Indicator, Headset Jack"

Digiwave DGL 890DS Circular Dss Dual LNBF D Type 11250 $30.55 Features Circular Dss Dual LNBF 11250Ghz Suitable for Existing Analog and Digital Reception Various Input Frequency Range and L.O. For World Wide Market Low Phase Noise for not only Analog also Digital Reception Superior Low Noise Figure and High Isolation VoltageControlled HV Switching 1318 V Excellent D.R.O. Stability Super Compact Tooling Best Solution for Individual and MultiSatellite System 40 mm Plastic Cover Frequency Range 11.7 12.25 GHz Output Frequency 950 1500 MHz Cross Pol. Isolation 22dB Noise Figure 0.6dB or better Conversion Gain V 60dB H 60dB L.O. Frequency 11.250 GHz

Digiwave DGL 890Q Circular Dss LNBF 4 Output L Type $45.5 Features Circular Dss LNBF 4 Output 11250Ghz Suitable for Existing Analog and Digital Reception Various Input Frequency Range and L.O. For World Wide Market Low Phase Noise for not only Analog also Digital Reception Superior Low Noise Figure and High Isolation VoltageControlled HV Switching 1318 V Excellent D.R.O. Stability Super Compact Tooling Best Solution for Individual and MultiSatellite System 40 mm Plastic Cover Frequency Range 11.7 12.25 GHz Output Frequency 950 1500 MHz Cross Pol. Isolation 22dB Noise Figure 0.6dB or better Conversion Gain V 60dB H 50dB L.O. Frequency 11.250 GHz

Mgr Vs Sir DSS $8.99 Mgr Vs Sir DSS

Panasonic KX-TG5100M-R 5.8 GHz DSS Expandable Cordless Phone with Answ $104.99 "Panasonic KX-TG5100M The Panasonic KX-TG5100M is a 5.8GHz cordless phone with single line operation. It features caller id/call waiting which allows you to see who is calling before deciding to pick up. Comes with a digital answering system with up to 15 minutes of record time. This system can be expanded up to 8 handsets. KX-TG5100M Features: 89 Channels, 5.8GHz Cordless Phone, Caller ID / Call Waiting, Expandable Up To 8 Handsets, 15 Minute Digital Answering System, Time and Day Stamp, Call Screening / Intercept, Remote Access, Memo Recording, Toll Saver (Rings Adjust When You Have Messages), Voice Menu, Dual Speakerphone (Base &amp Handset), 3-Line LCD Display, 50 Station Name / Number Caller ID Memory, Up To 5-Way Conferencing, 3 Selectable Ringtones, Intercom, Handset Locator, Chain Dial, Redial, Flash, Navigation Keys, Headset Jack, Belt Clip - Included w/ Brand New Models, Additional Handsets For This Model Are: Panasonic KX-TGA510M Additional Batteries For This Model Are: HHR-P402A / CPH-487 for Panasonic"

Sarah Dss. Marlborough $39.99 Sarah Dss. Marlborough - Giclee Print

Panasonic DSS Console Black KXT7740BK $195.15 Panasonic DSS Console Black KXT7740BK

PCI DSS $19.95 This handy pocket guide will provide you with all the information you will need when considering how to approach the PCI DSS, and is an ideal tool for awareness training for your PCI staff.

VTech mi6807 5.8 DSS Accessory Handset in Silver/Titanium $29.24 Frequency Band/Bandwidth 5.80 GHz. Color: Silver. Connectivity: Cordless RF. Caller ID 50 Name / Number Memory. Call Waiting. Any Key Answer. Call Transfer. Phone Book 50 Station. Conference Call 3Way. Intercom. Compatible Devices: VTech Cordless Phone mi6866 or mi6879.

48 Button DSS Console $162.18 - 48 Button digital DSS console- Designed for use with the LDP phones- BlackLGBLDP7248DSS

48-Button DSS Console - White $142.56 - 48-Button DSS console- 16 Programmable CO keys- 48 DSS/BLF keys- Volume keys for speaker and headset- Wall mountableKXT7740

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110-Button DSS Labels (10 pk) $26.5 - NEC 110 button DSS labels- 10 PackNEC80650DSS~~

Panasonic DSS Console - White $124.86 - Panasonic DSS Console- Electronic modular switching system- 32 DSS Buttons and 16 Programmable feature buttons- Compatible with all of the Panasonic electronic modular switching systems except the KX-T30810 system- White/greyKXT7040

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Northwestern Bell 35858M1 5.8 GHz Cordless DSS Telephone Set With Digital Answering System $220.99 5.8GHz Expandable cordless telephone system with digital answering machine Comes bundled with one extra handset and charger Can add up to 4 handsets total Caller ID call waiting caller ID 40 number Caller ID memory. Features Voicemail message waiting indication New call icon Name and number erase Caller ID call back Private call indication Date and time stamp 75 Channel autoscan Digital voice codec Pageintercom Call transfer 3Way conference Flashpauseredial Hearing aid compatible Wall mountable (base unit only) Auto answer 20 number memory Ringer onoff Receiver volume control Tonepulse dialing 5 Ringer melodies 13 Minutes of record time Remote access Voice menu Daytime stamp Call screening Ring selection (35 or toll saver) Answer onoff Headset jack

DSS Digital Voice Recorder $299.99 The features on this device are endless with a new central navigation pod superb sound a large backlit LCD and great file management options with DSS Player software to hel

Ear Force DSS $77.99 Ear Force DSS is a 7.1 Channel Dolby Surround Sound processor that can attach to any stereo headset. Compatible with XBOX, PS3 and PC digital outputs.

DigiStore Solutions Centurion DiscHub CHUB-DSS $299.99 DigiStore Solutions Centurion DiscHub CHUB-DSS

Panasonic / Panasonic DSS Console - White / KX-T7040 $137.58 Panasonic - Panasonic DSS Console - White - KX-T7040

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Belkin / 3960J RJ45/RJ11 DSS 12OT / BE112234-10 $34.37 Belkin - 3960J RJ45/RJ11 DSS 12OT - BE112234-10

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VTech / Vtech 5.8GHz DSS Additional Handset / I5808 $81.48 VTech - Vtech 5.8GHz DSS Additional Handset - I5808

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Panasonic 48BTN DSS Console White KXT7740 $195.15 Panasonic 48BTN DSS Console White KXT7740

24B DSS Inserts (25 per pack) $26.5 - NEC 24B DSS inserts- 25 Per packNEC8065024DSS~~~~

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PCI DSS A Pocket Guide $14.95 This handy pocket guide will provide you with all the information you will need when considering how to approach the PCI DSS V2.0, and is an ideal tool for awareness training for your PCI staff.

NEC 110-Button DSS Label, Pack of 10. Each $26.79 Manufacturer: NEC. Each. Customers also search for: Discount 110-Button DSS Label, Pack of 10, Buy 110-Button DSS Label, Pack of 10, Wholesale 110-Button DSS Label, Pack of 10, 714627133965 Miscellaneous Installation Supplies

DSS 24 Plus - switch - 24 ports - desktop $123.99 D-Link DSS 24 Plus - Switch - 24 x 10/100 - desktop

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