SFP+ Direct Attach Cables for EX Series Switches
Small form-factor pluggable plus transceiver (SFP+) direct attach copper cables, also known as Twinax cables, are suitable for in-rack connections between servers and switches. They are suitable for short distances up to 7 m, making them ideal for highly cost-effective networking connectivity within a rack and between adjacent racks.
This topic describes:
Cable Specifications
Juniper Networks SFP+ direct attach cables are available in four lengths:
- 1 m (3.3 ft)—Supported on EX3200, EX4200, EX4500, and EX8200 switches
- 3 m (9.9 ft)—Supported on EX3200, EX4200, EX4500, and EX8200 switches
- 5 m (16.4 ft)—Supported on EX3200, EX4200, and EX8200 switches
- 7 m (23 ft)—Supported on EX3200, EX4200, EX4500, and EX8200 switches
 | Note: When you use SFP+ direct attach cables with your EX Series switches, we recommend that you use only Juniper Networks SFP+ direct attach cables. |
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 SFP+ modules, 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 up to 10 Gbps.
Table 1 describes the cable specifications.
Table 1: SFP+ Direct Attach Cable Specifications
Model | Specification | |
|---|---|---|
EX-SFP-10GE-DAC-1m | Rate | 10 Gbps full-duplex serial transmission |
Connector type | SFP+ passive Twinax cable assembly | |
Supply voltage | 3.3 V | |
Power consumption (per end) | 0.57 W | |
Storage temperature | -40°C to 85°C | |
Cable type | Twinax | |
Wire AWG | 30 AWG | |
Minimum cable bend radius | 1 in. | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 2% maximum | |
Time delay | 1.31 nsec/ft | |
Length | 1 m (3.3 ft) | |
EX-SFP-10GE-DAC-3m | Rate | 10 Gbps full-duplex serial transmission |
Connector type | SFP+ passive Twinax cable assembly | |
Supply voltage | 3.3 V | |
Power consumption (per end) | 0.57 W | |
Storage temperature | -40°C to 85°C | |
Cable type | Twinax | |
Wire AWG | 30 AWG | |
Minimum cable bend radius | 1 in. | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 2% maximum | |
Time delay | 1.31 nsec/ft | |
Length | 3 m (9.9 ft) | |
EX-SFP-10GE-DAC-5m | Rate | 10 Gbps full-duplex serial transmission |
Connector type | SFP+ passive Twinax cable assembly | |
Supply voltage | 3.3 V | |
Power consumption (per end) | 0.57 W | |
Storage temperature | -40°C to 85°C | |
Cable type | Twinax | |
Wire AWG | 24 AWG | |
Minimum cable bend radius | 2 in. | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 2% maximum | |
Time delay | 1.31 nsec/ft | |
Length | 5 m (16.4 ft) | |
EX-SFP-10GE-DAC-7m | Rate | 10 Gbps full-duplex serial transmission |
Connector type | SFP+ passive Twinax cable assembly | |
Supply voltage | 3.3 V | |
Power consumption (per end) | 0.57 W | |
Storage temperature | -40°C to 85°C | |
Cable type | Twinax | |
Wire AWG | 24 AWG | |
Minimum cable bend radius | 2 in. | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 2% maximum | |
Time delay | 1.31 nsec/ft | |
Length | 7 m (23 ft) |
Standards Supported by These Cables
The cables comply with the following standards:
- SFP mechanical standard SFF-843—see ftp://ftp.seagate.com/sff/SFF-8431.PDF.
- Electrical interface standard SFF-8432—see ftp://ftp.seagate.com/sff/SFF-8432.PDF.
- SFP+ Multi-Source Alliance (MSA) standards
