Q: Is this a power supply or a power entry module? A: It is a power entry module (PEM) that feeds the 950W AC power supply in a Catalyst 6503 chassis. Q: Can it be replaced without downtime? A: Yes, it is field-replaceable and can be swapped during maintenance when redundant power is available. Q: Which chassis is it for? A: It is designed for Catalyst 6503 configurations that utilize the 950W AC PSU. Q: What input does it accept? A: Standard AC input up to 15A in supported regions. Q: Do I need any additional cables? A: Appropriate AC power cords are required and typically sold separately.