SIM Protocol
A subscriber identification module (SIM) card is a storage device containing the user's service subscriber key, which in turn identifies the subscriber on certain devices he uses, such as computers and mobile phones. SIM cards communicate with these devices and other readers via the SIM protocol.
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T=0
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Transmission Protocol Data Units, or TPDU, refer to data structures exchanged by the card reader and SIM card. TPDUs use a T=0 and T=1 protocol for this communication. The T=0 TPDU contains a data structure that is sent from a device or reader to the SIM card and also sent back from the SIM card, creating a command and response structure.
T=1
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The other protocol, T=1, enables blocks, or grouped collections of data, to be transferred between the reader and SIM card. The three blocks used in the T=1 protocol include the supervisory block, which controls data transfer between readers and SIM cards; a receive ready block, which positively acknowledges a received block or negatively acknowledges (denies) a block; and an information block, which enables the exchange of data between the SIM card and reader application software.
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APDU
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The T=1 or T=0 SIM card protocols support application-level protocols between the reader and SIM card applications. APDUs, or application data protocols, enable T=1 blocks and T=0 data structures to move through application protocol layers.
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References
- PCmag.com: Definition of: SIM card
- "Personal Identification Number"; Lambert M. Surhone, Miriam T. Timpledon, and Susan F. Marseken; 2010
Resources
- "Cellular Communications Explained: From Basics to 3G"; Ian Poole; 2006
- Photo Credit smart phone image by Jon Le-Bon from Fotolia.com
