IEC 61158-2:2010(E) specifies the requirements for fieldbus component parts. It also specifies the media and network configuration requirements necessary to ensure agreed levels of: - data integrity before data-link layer error checking; - interoperability between devices at the physical layer. This fifth edition cancels and replaces the fourth edition published in 2007. This edition constitutes a technical revision. It includes the following significant technical changes with respect to the previous edition: - for Type 18, Table 157 reduced tolerance to 5%; - for Type 18, in 32.5.3.1 removed minimum cable length; - for Type 18, in 32.5.4. and R.2.2 cable reference removed; - for Type 18, Table 160 and 161 terminating resistor value changed to 680 Ohm.