SFP+ Direct Attach Copper Cables for EX Series Switches


Small form-factor pluggable plus transceiver (SFP+) direct attach copper (DAC) cables, also known as Twinax cables, are suitable for in-rack connections between servers and switches. They are suitable for short distances, making them ideal for highly cost-effective networking connectivity within a rack and between adjacent racks.


We recommend that you use only SFP+ DAC cables purchased from Juniper Networks with your Juniper Networks device.


If you face a problem running a Juniper Networks device that uses a third-party optic or cable, the Juniper Networks Technical Assistance Center (JTAC) can help you diagnose the source of the problem. Your JTAC engineer might recommend that you check the third-party optic or cable and potentially replace it with an equivalent Juniper Networks optic or cable that is qualified for the device.

Cable Specifications

EX  Series switches support SFP+ passive DAC cables. The passive Twinax cable is a straight cable with no active electronic components. EX  Series switches support 1  m, 3  m, 5  m, and 7  m long SFP+ passive DAC cables. See Figure 1.

Figure 1: SFP+ Direct Attach Copper Cables for EX  Series Switches
SFP+ Direct Attach Copper
Cables for EX  Series Switches

The cables are hot-removable and hot-insertable: You can remove and replace them without powering off the switch or disrupting switch functions. A cable comprises a low-voltage cable assembly that connects directly into two 10-Gigabit Ethernet ports, one at each end of the cable. The cables use high-performance integrated duplex serial data links for bidirectional communication and are designed for data rates of up to 10  Gbps.

List of DAC Cables Supported on EX  Series Switches

For the list of DAC cables supported on EX  Series switches and the specifications of these cables, see:

Standards Supported by These Cables

The cables comply with the following standards: