Juniper QFX3000-G QFabric, Deployment Manual, Page: 141 / 652

Small form-factor pluggable plus (SFP+) direct attach copper (DAC) cables, also known
as Twinax cables, are suitable for in-rack connections between servers and QFX3500
devices.
You can use DAC cables purchased from a third party. These cables should meet the
specifications described in
Table 33 on page 116 and Table 34 on page 118 .
Table 32 on page 115 describes the Junos OS software releases that supports third-party
DAC cables. Prior releases do not support third-party DAC cables.
Table 32: Third-Party SFP+ DAC Cable Support
Third-Party DAC Cable Support Added Platform
Junos OS 11.3X30.6 QFX3500 Node device in a QFabric system
Junos OS 11.3R4 QFX3500 device as a standalone switch
NOTE: This topic does not describe which devices support these transceivers.
For information about which transceivers are supported on QFX Series devices,
see the following topics:
• Interface Support for the QFX3600 Device on page 97
•
Interface Support for the QFX3500 Device on page 100
The cables are hot-removable and hot-insertable. A cable consists of a cable assembly
that connects directly into two SFP+ modules, one at each end of the cable. The cables
use integrated duplex serial data links for bidirectional communication and are designed
for data rates up to 10 Gbps. There are two types of DAC cables:
•
Passive DAC cables have no signal amplification built into the cable assembly.
Table 33 on page 116 describes the passive DAC cable specifications.
• Active DAC cables have signal amplification and equalization built into the cable
assembly.
Table 34 on page 118 describes the active DAC cable specifications.
115 Copyright © 2015, Juniper Networks, Inc.
Chapter 7: Ports and Connectors