Nokia 7250 Ixr X1 Installation Guide _best_ Link
If ZTP is not used, the Open Network Install Environment (ONIE) can be used to manually install the operating system.
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. While the legacy Nokia 7250 was a popular mobile phone from 2003, the modern IXR series is a sophisticated 1RU (rack unit) router that provides up to 14.4 Tb/s of system capacity. Hardware Installation and Specifications nokia 7250 ixr x1 installation guide
For detailed step-by-step chassis mounting and cabling, refer to the following official Nokia resources: 7250 IXR Hardware Documentation Hub If ZTP is not used, the Open Network