Gsm Fixed
Gsm Fixed
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Why is the network expansion of CDMA much fast/cheaper than GSM?
(1) I have seen CDMA fixed phones lines. But I heard that it is a technology that should be used to mobile phones?
If so why arent our mobile phones on CDMA?
(2) How do you compare CDMA to GSM? They say setting up CDMA towers and expanding coverage over a large area is much easier, compared to GSM. Please explain
(3) Whats 'spread spectrum communications' and how is it related to CDMA and GSM?
thanks 
CDMA is a wireless method of allowing many people to
communicate on the same channel. This is called multiple access or the "MA" part of CDMA. It should not be confused with the mobile phone standards called cdmaOne and CDMA2000 (which are often referred to as simply "CDMA" from Qualcomm). CDMA is a form of "spread-spectrum".
Other forms of wireless multiple accesses are TDMA (time division) and FDMA (frequency division). To understand the analogy, you have many people in a room and they all want to talk. TDMA is only one talk at a time but at a small allotted time is allowed. FDMA is all talk at the same time but some uses a high pitch voice and other uses a low pitch voice and each train their ears to ignore the other pitches. CDMA being a spread spectrum, everybody talks at the same time but uses a different code set, sort of like different languages. However the talking is repeated many times. By repeating many times you can make out the whole sentence. CDMA is not exactly repeating but a long string of code is used to represent a short information code and long string of codes can be jammed and still make out the information.
Other forms of CDMA besides the Qualcomm's cdmaOne and CDMA2000 are the Global Positioning System (GPS) and WCDMA (which is the none-Qualcomm version of 3G).
GSM is the none-Qualcomm version of 2G and is based on TDMA. Other forms of TDMA is DAMPS and Nextel's iDEN or DECT cordless phone standard.
There are fixed version of both cdmaOne and GSM or other forms using CDMA or TDMA. The only difference between fixed and mobile is that there are no cell site handoff, which mean that the fixed phone will work only within one cell site. If travel far away enough from the cell site, the call is drop. Cell sites are about 1 mile apart, depending on buildings and terrain.
2G and 3G; what are they? 2G provides voice and slow Internet access of equivalent speed to dialup, while 3G also does voice but can provide Internet access at DSL or Cable Modem speeds, while you are mobile (driving at 100 miles per hour.)
There are 2 major completing standard groups:
1. 3GPP - this is the miss-named GSM to most people. 2G is supported using TDMA with GSM standard. Thus the GSM misuse. 3G is supported using CDMA with WCDMA standard. Thus a 3G mobile phone is actually 2 phones in one using both TDMA and CDMA. Nevertheless people still call this 3G GSM, which is incorrect.
2. 3GPP2 - this is the Qualcomm completing standard to 3GPP. 2G is supported using CDMA with cdmaOne standard, and 3G also uses CDMA with CDMA2000 standard. Thus the upgrade for networks that started out using cdmaOne (Verizon and Sprint) from 2G to 3G capability took place sooner as the upgrade only involved changing out circuit cards.
The upgrade from 2G to 3G for 3GPP is not as easy as it involved adding additional racks of equipment. AT&T and T-Mobile are service providers here in USA.
Adding a Gsm Gateway to Your Pabx Phone System Will Save Your Money
What is a GSM Gateway?
A GSM Gateway is in simple terms a mobile phone appliance that when attached to a PABX phone system will enable you to make calls from your Phone System using a mobile network. By putting an Unlimited or Capped Call Plan SIM card into the GSM gateway and programming the PABX to direct outbound calls via the Gateway, $000s can be saved. Anyone who gets their landline phone bill will see that any calls made to a mobile number are the most expensive. Mobile numbers have high call rates and it is easy to run up a big telephone bill if you make them regularly. If you want to make calls to a mobile phone number it is often the mobile carriers that offer the better deals, not the fixed wire carriers.
Here’s an example how GSM Gateway can cut your phone bill.
Metro Hotel A has a total of 50 rooms to let, at present they have a company plan on their landlines with one of the country’s leading Telco’s. They had 6 dedicated voice lines and they did at that time spend around $1000 a month on phone calls to landlines and mobiles within Australia. Then they add a 4 port GSM gateway and 4 Telaustralia Unlimited Call Plan SIM Cards for $119 per month each. On these call plans, all calls to Landlines and Mobiles within Australia are unlimited and untimed so their bill for calls to mobiles & landlines will come to $476 per month…a total saving of around 50% or $6000 per annum. As they now have 4 GSM Gateway lines committed to outbound calls, the total quantity of landlines has been reduced to 3 which also save them a further $100 each month on line rental charges.
What do I need to use a GSM Gateway?
What you need to have is a programmable PABX phone system, and that system needs to facilitate at least one free analogue port. Also needed is an active SIM card on the mobile phone plan you want. Your PABX Maintainer will install the Gateway for you and program your PABX system so that you can nominate which lines will route via the GSM Gateway.
Is it a cheaper method to use than VoIP?
Generally, using a GSM Gateway for PABX Phone Systems works out less expensive than VoIP. If you on the other hand making lots of International calls, VoIP might suit you better. The real advantage of using a GSM gateway is simplicity. Once installed and programmed there are no other ongoing support costs, call quality issues or technical support required. Imaging connecting a Mobile Phone, and then leaving it on a shelf in your office, that’s what connecting a GSM gateway is comparable to doing. On average prices for a unit start from $500 Aus installed for a single SIM device and in the region of $1800 for a 4 Channel device. Units can be purchased in increments of 1, 2, 4, 8, 12, 16, 20, 24, 28 right up to 32 Channel (32 SIM cards) that are able to be connected to Primary Rate ISDN 10/20/30 PABX Systems.
About the Author
Michiel Van Kets provides article services for Tony Dunphy who is Managing Director of Telaustralia, an Australian Business Telecommunications Company offering services and products such as Internet & Networks, Phone Systems and GSM gateway. For info on GSM Gateway for PABX Phone Systems visit the website.
UTStarcom Fixed mobile convergence business case
