ETSI ES 203021 / ETSI ES 203 021 Access and Terminals (AT);Harmonized basic attachment requirements for Terminals for connection to analogue interfaces of the Telephone Networks

EN 300132-2 / EN 300 132-2 Environmental engineering (EE) - Power supply interface at the input to telecommunications equipment - part 2: Operated by direct current (dc)

ETSI ES 201468 / ETSI ES 20 1468 Electromagnetic compatibility and Radio spectrum Matters (ERM); Additional ElectroMagnetic Compatibility (EMC) requirements and resistibility requirements for telecommunications equipment for enhanced availability of service in specific applications

EN 300386 / EN 300 386 Electromagnetic compatibility and radio spectrum matters (ERM) – telecommunication network equipment - electromagnetic compatibility (EMC) requirements

ITU-T K.20

ITU-T K.21

ITU-T K.44

ITU-T K.45

ITU-T K.54

FCC Part 68 / TIA/EIA IS-968 

IC CS03

PSTN01

PLMN01

PLMN08

PLMN09

TBR 21 / ETSI ES 203021 / ETSI ES 203 021