This standard is applicable to all kinds of equipment with numeric input used in homes. It specifies a layout of numerical keyboards with three rows of three keys each and a fourth row with at least one key.
DS/EN 60948:1998 history
1998DS/EN 60948:1998 Numeric keyboard for home electronic systems (HES)
1991DS/IEC 948:1991 Numeric keyboard for home electronic systems (HES)