Tieline Patriot POTS only codec is now the ultimate codec for wireless transmission, with both Cell Phone and the GSM to landline feature. Using a serial data cable between your cellpohone with on-board modem and a Tieline codec you can achieve up to 7kHz audio over standard GSM networks and up to 15kHz over High Speed Circuit Switched (HSCSD) GSM networks. If GSM is not available in your area, you can connect over almost any cell network using Tieline's "Cellphone Mode" and deliver up to 3.5kHz. audio The GSM feature is fully integrated into the Tieline Patriot codec only. If you purchased a Patriot after February 2003, you will only need a software upgrade. Patriots prior to Feb 2003 will require a small firmware modification.
GSMGSM networks deliver wireless high quality and secure mobile voice and data. Today's highly successful GSM wireless technology has become the world's leading and fastest growing mobile standard, spanning over 190 countries. GSM technology is used by 1 in 7 of the world's population and it is estimated that by the end of 2004 it will top one billion.
Cellphone networks provide a “voice” channel
and a “data” channel. Tieline’s GSM
data facility connects over the data channel and is therefore relying
on the telco’s commitment to wireless data integrity, bit rate allocation
and link reliability.
What do I need for GSM?All you need to start using the new GSM feature is a Cell phone (with a built in GSM data modem), a serial data cable that will connect the Phone to the DATA PORT on the Tieline, and the latest CPU and DSP software. We recommend the Nokia 6310 and the 6310i mobiles. Some service providers package voice and data with as a standard subscription and others require you to enable "data calls" from your mobile separately. Please check with your service provider to ensure they have enabled data calls for your service and your phone has data calling enabled. If you want total wireless freedom consider the TLB100 or TLB150 Tieline battery kit which can deliver up to 5 hours of broadcasting.
How does GSM work?GSM uses a process called Circuit Switching. Circuit-switching is a method of communicating where a communications path is established between two devices through one or more switching nodes. The digital data is sent as a continuous stream of bits, allowing the data to be heard from the receiving end whilst the data is still being sent. This makes circuit switching an ideal method of sending real time audio. This is different from GPRS which sends packets of information which need to be reassembled before they can be heard and is therefore not suitable for real time audio broadcast applications.
How do I set up a GSM mode?
To set up both the local and remote Tielines for "GSM mode" simply change the "Op Mode" to "5 GSM DATA MODE" from the "View Config" menu. After that, all that's required is to plug your Cell Phone into the "DATA PORT" of your codec and then dial the desired landline via the codecs keypad. Note: Once connected In GSM mode the "Bit Rate" cannot be changed.
Standard Cell Phone ModeWhere GSM is not available, you can still create a wireless connection over your Tieline codec using your ear/mic handsfree wire. In Cell Phone mode, you can use all the facilities of your remote Tieline codec (ie microphones and headphones) and you can dial from the mobile telephone directly to a standard land line. You do not need to dial codec to codec. This is because Cell Phone mode is a normal analogue call. Tieline iMix, Commander and Patriot codecs feature a standard cell phone hands free interface via a 3.5mm jack located on the rear of each product. You can broadcast over any cellular network because the connection is made in normal telephone mode bypassing the modems and DSP compression system. Normal cell phone quality audio can be delivered over the link. It is easy to modify your own cell phone ear piece / hands free kit to interface with the Tieline codecs. All you need is the microphone wire of your hands free attached to the tip of the 3.5mm plug and the headphone wire attached to the ring of the connector. A battery option to support total wireless freedom is also available. ** Commander and Express units built prior to 2002 are not capable of wireless interface but can be upgraded. Please contact Tieline by clicking here for International or here for America
What do I need for standard Cell Phone mode?The Cell Phone feature is very easy to set up, and only requires a cell phone, a modified hands free cable and depending on how old your unit is you may require a CPU and DSP software upgrade as well.
How do I set up Cell phone mode?To set up the Tieline for Cell Phone mode simply change the units "Op Mode" to "mobile mode" from the "view config" menu and plug the cell phone into the cell phone port of the rear of the codec via the modified hands free cable. Please note however, when dialing in cell phone mode you must dial via the Cell Phone keypad not the Tieline codec keypad. Cell phone mode allows you to connect over any wireless network including GSM, CDMA, 1XRTT etc. Please note however using any of these modes still limits the line quality to the 3 KHz mobile network limit. 
How do I modify the hands free wire to work in cell phone mode?The cell phone needs to be connected to the codec via the "Hands free ear/mic cable" suited to your specific phone (available from your phone dealership). This "hands free cable" can be modified by cutting the headphone and microphone from the cable and wiring the microphone to the tip of a 3.5mm stereo plug and the earphone to the ring. The hands free cable is now ready for connection to the "Cell Phone" socket of your Tieline. 
What’s the difference between GSM and Cell Phone modes?Ordinary Cell phone mode is limited to the mobile networks data rate of 3 KHz whereas GSM mode can achieve more especially when used with HSCSD networks where up to 15khz of audio can be achieved.
Glossary of termsGSM | GPRS| EDGE | 3GSM| HSCSD (Information courtesy of GSMworld.com) The below platforms are all part of the GSM wireless evolution GSMToday's second-generation GSM networks deliver high quality and secure mobile voice and data services (such as SMS/Text Messaging) with full roaming capabilities across the world. GPRSGeneral Packet Radio Service (GPRS) enabled networks offer 'always-on', higher capacity, Internet-based content and packet-based data services. This enables services such as color Internet browsing, e-mail on the move, powerful visual communications, multimedia messages and location-based services. EDGEFurther enhancements in data capability over the core GSM network will be provided with the introduction of Enhanced Data rates for GSM Evolution - known as EDGE*. This will achieve the delivery of advanced mobile services such as the downloading of video and music clips, full multimedia messaging, high-speed color Internet access and e-mail on the move. 3GSM
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