Data over signalling

Data over signalling,^[1] or DoS, is a telecommunications term that refers to sending primary data over a signalling channel, instead of the subscriber's bearer channel.^[2][3]

Background

Data over signalling was designed as a solution to the problem of transceiving simultaneous voice and data.

Data over signalling can be utilized when the signalling channel is either channel associated or common. However, it is easier to implement when the signalling channel is channel associated, as the system does not have to demultiplex the data and signalling between multiple subscribers.

DoS was designed so that mobile telephony subscribers could maintain a voice session on their bearer channel while still accessing data related services, such as text messaging.

References and notes

1. ^ Also spelled "Data over signaling".
2. ^ Clark et al. (1996-02-06). "US Patent 5,490,251". http://www.google.com/patents?id=CPMoAAAAEBAJ. Retrieved 2008-08-21. 
3. ^ Pinault et al. (2005-11-10). "US Patent Application Publication 2005/0249146 A1". http://www.google.com/patents?id=K_CTAAAAEBAJ. Retrieved 2008-08-21. 

See also

• Simultaneous voice and data
• V.70
• V.61

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