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The WS-C3850-48XS-F-E is the F-suffix version of the 48-port SFP+ Catalyst 3850, built around a different power supply from the standard model. It takes the PWR-C3-750WAC-F supply, while WS-C3850-48XS-E takes the PWR-C3-750WAC-R. The configuration row for the 48XS family reads 48 x 1/10G SFP+ with a 750WAC supply marked front to back, so check the supply label against your rack airflow.
The ports are 48 SFP+ for 1G or 10G optics and 4 QSFP+, all fixed. The 48XS has no StackWise-480 and no StackPower, so it runs as a standalone switch. The feature set is IP Services, and for the IP Services the 48-port DNA license IDs are C3850-DNA-E-48 and C3850-DNA-A-48. The switch ships with three field-replaceable fans in a redundant arrangement.
Measured with no PoE at 115 VAC, power draw is 267.0 W with no traffic, 268.3 W at 10 percent and 288.1 W at 100 percent, with a weighted average of 270.1 W. The chassis is 1.75 x 17.5 x 20.1 in (4.45 x 44.5 x 51.1 cm) and weighs 16.42 lb (7.45 kg). MTBF is 286,900 hours. The rest of the Catalyst 3850 fiber range is in Cisco switches.
Related: Cisco 3850 switch parts
| Part number | WS-C3850-48XS-F-E |
| Ports | 48 x 1/10G SFP+, 4 x QSFP+ |
| Power supply | PWR-C3-750WAC-F (750 W AC) |
| Standard-model supply | PWR-C3-750WAC-R |
| Feature set | IP Services |
| Stacking | StackWise-480 no, StackPower no |
| Fans | 3 field-replaceable |
| Power draw | 267.0 W idle, 288.1 W at 100% traffic (115 VAC, no PoE) |
| Dimensions | 1.75 x 17.5 x 20.1 in |
| Weight | 16.42 lb |
| MTBF | 286,900 hours |
| Form factor | 1RU |