In this paper, The authors contrive a model that underpins the offline Physical Layer Impairment-Routing and Wavelength Assignment (PLI-RWA) issue in translucent networks. The authors introduce an innovative PLI-Signal Quality Aware RWA (PLI-SQARWA) algorithm that guarantees zero blocking due to signal degradation and wavelength contention and aims at minimizing the total required number of network components i.e. regenerators and All-Optical Wavelength Converters (AOWCs). Further, in view of reducing the time delay due to Optical-Electrical-Optical (OEO) conversions, they propose a novel electro-optical hybrid translucent node architecture. They show that PLI-SQARWA outperforms a recent heuristic for RWA and Regenerator Placement (RP) in terms of Capital Expenditure (CapEx) and time delay; while demonstrating superior blocking performance at all traffic loads.