DS/IEC 62055-41:2014

Electricity metering - Payment systems - Part 41: Standard transfer specification (STS) - Application layer protocol for one-way token carrier systems

This part of IEC 62055 specifies the application layer protocol of the STS for transferring units*of credit and other management information from a point of sale (POS) system to an STScompliant*payment meter in a one-way token carrier system. It is primarily intended for*application with electricity payment meters without a tariff employing energy-based tokens,*but may also have application with currency-based token systems and for services other than*electricity.*It specifies:*- a POS to token carrier interface structured with an application layer protocol and a*physical layer protocol using the OSI model as reference;*- tokens for the application layer protocol to transfer the various messages from the POS to*the payment meter;*- security functions and processes in the application layer protocol such as the Standard*Transfer Algorithm and the Data Encryption Algorithm, including the generation and*distribution of the associated cryptographic keys;*- security functions and processes in the application layer protocol at the payment meter*such as decryption algorithms, token authentication, validation and cancellation;*- specific requirements for the meter application process in response to tokens received;*- a scheme for dealing with payment meter functionality in the meter application process*and associated companion specifications;*- generic requirements for an STS-compliant key management system;*- guidelines for a key management system;*- entities and identifiers used in an STS system;*- code of practice for the management of TID roll-over key changes in association with the*revised set of base dates;*- code of practice and maintenance support services from the STS Association.*It is intended for use by manufacturers of payment meters that have to accept tokens that*comply with the STS and also by manufacturers of POS systems that have to produce STScompliant*tokens and is to be read in conjunction with IEC 62055-5x series.*STS-compliant products are required to comply with selective parts of this International*Standard only, which is the subject of the purchase contract (see also Clause C.11).*NOTE Although developed for payment systems for electricity, the standard also makes provision for tokens used*in other utility services, such as water and gas.