MAKS–E1 (2012 modification) is designed for certification and commissioning of PDH and SDH digital transmission systems. The new device combines all performance capabilities of MAKS-Е1 and MAKS-Е10 devices. Device functions are divided into separate options. Two modifications of the device are available: “r” (MAKS-Е1r) with RJ-45 connectors on measuring interfaces and “b” (MAKS-Е1b) with banana jacks.