This part number, IBM 03N7035, appears to refer to a Multi Tech Modem, model MT5600 Series z7, typically found in enterprise networking contexts. It has been listed for sale by various resellers, often refurbished.
Packaging was very secure. Electrostatic safe and well-padded.
No issues during the 48-hour burn-in test.
Reliable and robust. We have been running this for 3 months now with zero downtime.