Juniper EX4400-EM-4S 4-Port 1/10GbE SFP+ Expansion Module for EX4400

The Juniper EX4400-EM-4S is a 4-port 1/10GbE SFP+ expansion module for the Juniper EX4400 series access switches — adding dedicated SFP+ uplink or stacking ports to EX4400 deployments for 10G distribution connectivity, Virtual Chassis stacking, or flexible uplink expansion in enterprise campus and data center access environments.

Key Features

• 4 x SFP/SFP+ ports (1GbE/10GbE) expanding EX4400 uplink or stacking capacity
• Plugs into EX4400 expansion module bay for tool-free installation
• Supports standard SFP/SFP+ transceivers and DAC cables for flexible connectivity
• Junos OS managed — no separate configuration for expansion module ports
• Enables 10GbE uplinks or Virtual Chassis inter-switch links on EX4400

Product Specifications

• Part Number: EX4400-EM-4S
• Manufacturer: Juniper Networks
• Ports: 4 x SFP/SFP+ (1GbE/10GbE)
• Compatible System: Juniper EX4400 series
• Module Type: Expansion Module (EM)
• Hot-Plug: Yes
• Management: Junos OS

Switch & Port Specifications

• Port Speed: 1GbE (SFP) or 10GbE (SFP+) per port
• Total Bandwidth: Up to 40 Gbps (4 x 10GbE)
• Transceiver Support: Standard SFP and SFP+ optics, DAC cables
• Stacking: Ports usable for Virtual Chassis inter-switch links
• Module Bay: EX4400 expansion module bay

Network & Protocol Specifications

• Layer 2/3: Full Junos OS L2 and L3 feature support on expansion ports
• VLANs: Shared with EX4400 VLAN table (4,094 VLANs)
• QoS: 8 queues per port, DSCP, 802.1p marking
• Management: Junos OS CLI, NETCONF, Juniper Mist cloud platform

Use Cases

• Adding 10GbE SFP+ uplink capacity to Juniper EX4400 access switches
• Virtual Chassis inter-switch 10G stacking links between EX4400 units
• Flexible 1GbE/10GbE port expansion for mixed-speed uplink requirements
• Campus distribution uplinks requiring additional SFP+ port density on EX4400

Compatibility

• Juniper EX4400 series switches (EX4400-24T, EX4400-24P, EX4400-48T, EX4400-48P, EX4400-48MP)
• Accepts standard Juniper SFP and SFP+ transceivers and DAC cables
• Managed via Junos OS and Juniper Mist cloud platform
• Verify EX4400 Junos OS version for EX4400-EM-4S expansion module support

Frequently Asked Questions

How many EX4400-EM-4S modules can be installed in an EX4400?

The EX4400 has one expansion module bay, supporting one expansion module at a time. The EX4400-EM-4S adds 4 SFP+ ports to the EX4400's base port count, providing up to 40 Gbps of additional uplink capacity.

Can the EX4400-EM-4S ports be used for Virtual Chassis stacking?

Yes — SFP+ ports on the EX4400-EM-4S can be configured as Virtual Chassis ports using compatible 10GbE SFP+ transceivers or DAC cables, enabling EX4400 units to form a Virtual Chassis stack for unified management and forwarding.

What is the difference between EX4400-EM-4S and EX-UM-8X8SFP?

The EX4400-EM-4S is the expansion module for the EX4400 series, providing 4 x SFP+ ports. The EX-UM-8X8SFP is the uplink module for the EX4300-32F, providing 8 x SFP+ ports. Each module is platform-specific and not interchangeable between EX series models.

The Juniper EX4400-EM-4S provides the SFP+ port expansion that EX4400 access deployments need for 10GbE distribution uplinks, Virtual Chassis stacking, and flexible mixed-speed connectivity — delivering Junos OS-managed expansion in a hot-plug module format for EX4400 campus and data center access switching.