The Single Wire Protocol (SWP) is a specification for a single-wire connection between the
SIM card
file:SIM-Karte von Telefónica O2 Europe - Standard und Micro.jpg, A typical SIM card (mini-SIM with micro-SIM cutout)
file:Sim card.png, A smart card taken from a Global System for Mobile Communications, GSM mobile phone
file:Simkarte NFC SecureE ...
and a
near field communication
Near-field communication (NFC) is a set of communication protocols that enables communication between two electronic devices over a distance of 4 cm (1 in) or less. NFC offers a low-speed connection through a simple setup that can be u ...
(NFC) chip in a cell phone. It was under final review by the
European Telecommunications Standards Institute
The European Telecommunications Standards Institute (ETSI) is an independent, not-for-profit, standardization organization in the field of Information and communications technology, information and communications. ETSI supports the developmen ...
(ETSI).
SWP is an interface between contactless frontend (CLF) and
universal integrated circuit card
A GSM mobile phone
file:SIM-DXAI20210313172217.jpg, alt=Black and white image of the contacts area of a SIM card showing the internal construction, X-Ray of a SIM card showing small rectangular semiconductor chip (central small rectangle) and 5 b ...
(UICC/SIM card chip). It is a contact-based protocol that is used for contactless communication. C6 pin of UICC is connected to CLF for SWP support. It is a bit-oriented
full duplex
A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow ...
protocol i.e. at the same time transmission as well as reception is possible. CLF acts as a master and UICC as a slave. CLF provides the UICC with energy, a transmission clock, data, and a signal for bus management. The data to be transmitted are represented by the binary states of voltage and current on the single wire.
See also
*
1-Wire
1-Wire is a device communications bus system designed by Dallas Semiconductor Corp. that provides low-speed (16.3 kbit/s) data, signaling, and power over a single conductor.
1-Wire is similar in concept to I²C, but with lower data rates and ...
*
NFC wired interface
*
HCI
Sources
# ETSI SCP Activity Report 2007.
# The Register, The future of the SIM hangs by a single Wire 2008.
# GSM Association: Requirements For SWP NFC Handsets V2 2008.
# Fast Company: Nokia's 2011 Smartphones Have Built-In Wireless Payment Tech: Take That, Apple!
References
Mobile phone standards
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