HP 0231A53E - MSR 4-port enhanced synchronous/asynchronous serial MIM module (MIM-4SAE) - Multifunction Interface Module (MIM) with four D 28-pin connectors that transmit, receive, and process data on serial interfaces including V.24, V.35, X.21, RS4 Retail
HP 0231A81E - Spare 7510 fan tray assembly - Includes six 92mm x 92mm (3.62in x 3.62in) fans and four 120mm x 120mm (4.72in x 4.72in) fans - Produces maximum air flow of 662CFM Retail
