The Juniper EX9251-8X4C-DC is a fixed-configuration Layer 3 managed Ethernet switch in the EX9250 Series, designed for carrier-class Ethernet switching in campus, data center, and aggregation deployments. It provides 8 x 10GbE SFP+ ports and 4 x rate-selectable QSFP+/QSFP28 ports that support 40GbE, 100GbE, and breakout configurations, along with a built-in Routing Engine, dual DC power supply support, and three fan trays for resilient operation on Junos OS.
| Properties | Juniper EX9251-8X4C-DC |
| Description | Fixed-configuration EX9251 switch with 8x 10GbE SFP+ ports and 4x rate-selectable 40/100GbE QSFP+/QSFP28 ports, built-in Routing Engine, three fan trays, and two DC power supplies |
| Product Family | EX9250 Series |
| Product Type | Ethernet Switch |
| Switch Type | Fixed Configuration |
| Routing Engine | Built-in Routing Engine |
| Included Cooling | 3 x fan trays |
| Included Power Supplies | 2 x DC power supplies |
| Interface Options | |
| 10GbE SFP+ | 8 ports (SFP+ transceivers) |
| 40GbE QSFP+ | 4 rate-selectable ports (QSFP+ supported) |
| 100GbE QSFP28 | 4 rate-selectable ports (QSFP28 supported) |
| Breakout Support | Each rate-selectable port can be configured as 4 x 10GbE using breakout cable |
| Management Port | 1 x RJ-45 autosensing 10/100/1000 Ethernet (out-of-band management) |
| Chassis Physical Specifications | |
| Rack Units | 1 U |
| Dimensions (W x H x D) | 19 x 1.72 x 18.5 in. (48.26 x 4.37 x 47 cm) Depth with fan tray and power supply handles: 20.43 in. (51.89 cm) |
| Weight (chassis) | 22.7 lb (10.3 kg) |
| Mounting | 4-post 19-in rack or ETSI rack |
| Cooling Airflow | Front-to-back airflow (AFO fan trays) |
| Specifications | EX9251-8X4C-DC |
| Switch Architecture | Ethernet-optimized fixed configuration switch with built-in Routing Engine |
| Switching Throughput | Up to 400 Gbps |
| Operating System | Juniper Networks Junos OS |
| Port Configuration | 8 x 10GbE SFP+ and 4 x rate-selectable 40/100GbE QSFP+/QSFP28 |
| Port Flexibility | Rate-selectable ports support 100G, 40G, and 10G breakout configurations |
| Transceiver Support | SFP+ on 10GbE ports; QSFP+ and QSFP28 on rate-selectable ports |
| Power Input | DC (dual power supply slots) |
| Power Redundancy | Dual power supply support (2 slots) |
| Cooling Redundancy | 3 fan trays |
| FRUs (Hot-removable / Hot-insertable) | Power supplies, fan trays, transceivers |
| Management and Operations | |
| CLI / OS Management | Junos OS CLI; common Junos OS code base across EX/M/MX/T/SRX platforms |
| Out-of-Band Management | RJ-45 10/100/1000 management Ethernet port |
| Timing Interfaces | Front-panel ToD and BITS RJ-45 ports |
| Operating Temperature | Refer to EX9251 hardware guide / environmental specifications in datasheet |
| Compliance | Refer to EX9251 hardware guide for full safety, EMC, and regulatory compliance details |
| Spare Parts and Blank Panels | |
| EX9251-CHAS | EX9251 chassis, spare |
| JNP-PWR-BLNK-1 | EX9251 power supply slot blank panel |
| Power Supply Options | |
| JPSU-650W-DC-AFO | 650 W DC power supply (front-to-back airflow) |
| Optics and Transceivers | |
| SFP+ | Supported on 10GbE ports (8x SFP+ interfaces) |
| QSFP+ | Supported on rate-selectable 40/100GbE ports |
| QSFP28 | Supported on rate-selectable 40/100GbE ports |
| Breakout Cables | Supported for converting each rate-selectable port to 4 x 10GbE |
