Terrestrial GSM networks cover more than 80% of the world's population, providing the widest coverage of any cell phone technology.
Tieline Technology's 3G UMTS/HSDPA module lets you connect over 3G and GSM wireless networks, providing flexible and adaptable wireless broadcast capabilities. So when wireless 3G broadband is unavailable you can still connect over GSM and do your live remote broadcast.
How does GSM work?
GSM uses a process called Circuit Switching, where a path is established between two devices through one or more switching nodes. Digital data is sent as a continuous bit stream, allowing the data to be heard from the receiving end while data is still being sent.
GSM Circuit Switched Data (CSD) connections are capable of sending single channel data at 9.6Kbps and high speed connections over HSCSD GSM networks are capable of sending a single data channel of up to 28.8Kbps.
Using GSM CSD technology Tieline codecs using the Voice G3* algorithm can send up to 7kHz audio quality over GSM networks throughout the US. With HSCSD connections they can send up to 15kHz audio using Tieline Music over networks in Europe, Asia and Canada.
GSM operates in the 900MHz and 1800MHz ranges in Europe and in the USA it uses the 850MHz and 1900MHz bands. Australia, Canada and several countries in Latin America use the 850MHz band. Visit www.gsmworld.com for more information about GSM coverage in your region.
Connection over GSM
What do I need for GSM?
Insert a Tieline 3G UMTS/HSDPA module into the codec at the remote site with a data-enabled SIM card fitted and install a POTS/PSTN module into the studio codec and attach a phone line. Configure the codec at the studio for a GSM data call and you are ready to connect - it's as simple as that!
The Tieline codec reference manual describes all GSM settings in detail and don't forget that every Tieline codec connection has an auxiliary data channel providing full remote control over audio input levels at the remote site.
* From the 31st March 2011 Tieline has discontinued support for the Voice G3 algorithm. As a result it has been omitted from the v.1.6.72 firmware release and all codecs purchased after this date. Codecs with firmware v.1.6.72 or higher can connect to G3 codecs running older firmware versions, but will have to use an algorithm other than Voice G3. Voice G3 is usually used for low-bitrate connections over GSM and POTS. We recommend using Tieline Music as a substitute for these low bit-rate connections.