Technical Documentation
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Interface Specifications for SFP+ DAC Cables for QFX3500 Device Access Ports
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 QFX3500 devices.
You can use DAC cables purchased from a third party. These cables should meet the specifications described in Table 2 and Table 3. Table 1 describes the Junos OS software releases that supports third-party DAC cables. Prior releases do not support third-party DAC cables.
Table 1: Third-Party DAC Cable Support
Platform | Third-Party Cable Supported |
|---|---|
QFX3000 QFabric system | Junos OS Release 11.3R1 or later |
QFX3500 device as a standalone switch | Junos OS Release 11.3R4 or later |
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 2 describes the passive DAC cable specifications.
- Active DAC cables have signal amplification and equalization built into the cable assembly. Table 3 describes the active DAC cable specifications.
Table 2: SFP+ Passive Direct Attach Copper Cable Specifications
Model | Specifications | |
|---|---|---|
QFX-SFP-DAC-1M | Rate | 10-Gbps full-duplex serial transmission |
Connector type | Copper pigtail | |
Supply voltage | 3.3 V | |
Power consumption (per end) | 0.015 W | |
Storage temperature | –40° C to 85° C | |
Cable type | Twinax | |
Wire AWG | 30 AWG | |
Minimum cable bend radius | 1 in. (2.54 cm) | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 1% maximum | |
Time delay | 4.3 nsec/m | |
Length | 1 m (3.3 ft) | |
Software required | Junos OS Release 11.1 or later | |
QFX-SFP-DAC-3M | Rate | 10-Gbps full-duplex serial transmission |
Connector type | Copper pigtail | |
Supply voltage | 3.3 V | |
Power consumption (per end) | 0.015 W | |
Storage temperature | –40° C to 85° C | |
Cable type | Twinax | |
Wire AWG | 30 AWG | |
Minimum cable bend radius | 1 in. (2.54 cm) | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 1% maximum | |
Time delay | 4.3 nsec/m | |
Length | 3 m (9.9 ft) | |
Software required | Junos OS Release 11.1 or later | |
QFX-SFP-DAC-5M | Rate | 10-Gbps full-duplex serial transmission |
Connector type | Copper pigtail | |
Supply voltage | 3.3 V | |
Power consumption (per end) | 0.015 W | |
Storage temperature | –40° C to 85° C | |
Cable type | Twinax | |
Wire AWG | 24 AWG | |
Minimum cable bend radius | 1.25 in. (3.2 cm) | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 2% maximum | |
Time delay | 4.3 nsec/m | |
Length | 5 m (16.4 ft) | |
Software required | Junos OS Release 11.1 or later | |
Table 3: SFP+ Active Direct Attach Copper Cable Specifications
Model | Specifications | |
|---|---|---|
QFX-SFP-DAC-1MA | Rate | 10-Gbps full-duplex serial transmission |
Connector type | Copper pigtail | |
Supply voltage | 3.3 V | |
Power consumption (per end) | 0.627 W | |
Storage temperature | –40° C to 85° C | |
Cable type | Twinax | |
Wire AWG | 30 AWG | |
Minimum cable bend radius | 1 in. (2.54 cm) | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 2% maximum | |
Length | 1 m (3.3 ft) | |
Software required | Junos OS Release 11.1 or later | |
QFX-SFP-DAC-3MA | Rate | 10-Gbps full-duplex serial transmission |
Connector type | Copper pigtail | |
Supply voltage | 3.3 V | |
Power consumption (per end) | 0.627 W | |
Storage temperature | –40° C to 85° C | |
Cable type | Twinax | |
Wire AWG | 30 AWG | |
Minimum cable bend radius | 1 in. (2.54 cm) | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 2% maximum | |
Length | 3 m (9.9 ft) | |
Software required | Junos OS Release 11.1 or later | |
QFX-SFP-DAC-5MA | Rate | 10-Gbps full-duplex serial transmission |
Connector type | Copper pigtail | |
Supply voltage | 3.3 V | |
Power consumption (per end) | 0.627 W | |
Storage temperature | –40° C to 85° C | |
Cable type | Twinax | |
Wire AWG | 30 AWG | |
Minimum cable bend radius | 1 in. (2.54 cm) | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 2% maximum | |
Length | 5 m (16.4 ft) | |
Software required | Junos OS Release 11.1 or later | |
QFX-SFP-DAC-7MA | Rate | 10-Gbps full-duplex serial transmission |
Connector type | Copper pigtail | |
Supply voltage | 3.3 V | |
Power consumption (per end) | 0.627 W | |
Storage temperature | –40° C to 85° C | |
Cable type | Twinax | |
Wire AWG | 30 AWG | |
Minimum cable bend radius | 1 in. (2.54 cm) | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 2% maximum | |
Length | 7 m (23 ft) | |
Software required | Junos OS Release 11.3 or later | |
QFX-SFP-DAC-10MA | Rate | 10-Gbps full-duplex serial transmission |
Connector type | Copper pigtail | |
Supply voltage | 3.3 V | |
Power consumption (per end) | 0.627 W | |
Storage temperature | –40° C to 85° C | |
Cable type | Twinax | |
Wire AWG | 28 AWG | |
Minimum cable bend radius | 2 in. (5 cm) | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 2% maximum | |
Length | 10 m (32.8 ft) | |
Software required | Junos OS Release 11.3 or later | |
