Technical Documentation
Related Documentation
- EX Series
- Optical Interface Support in EX3200 Switches
- Optical Interface Support in EX3300 Switches
- Optical Interface Support in EX4200 Switches
- Optical Interface Support in EX4500 Switches
- Optical Interface Support in EX8200 Switches
- Installing a Transceiver in an EX Series Switch
- Removing a Transceiver from an EX Series Switch
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
EX Series switches support SFP+ passive direct attach 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 direct attach cables.
Table 1 describes the support for SFP+ passive direct attach cable lengths on EX Series switches for Junos OS releases:
Table 1: Software Support for SFP+ Passive Direct Attach Cables for EX Series Switches
Switch | Software Support Added | Cable Length |
|---|---|---|
EX3200 switches | Junos OS Release 10.3 | 1 m, 3 m, 5 m, and 7 m |
EX3300 switches | Junos OS Release 11.3 | 1 m and 7 m |
EX4200 switches | Junos OS Release 10.3 | 1 m, 3 m, 5 m, and 7 m |
EX4500 switches | Junos OS Release 10.2 | 1 m, 3 m, and 7 m |
Junos OS Release 11.2 | 5 m | |
EX8200 8-port SFP+ line cards (EX8200-8XS) | Junos OS Release 10.0 | 1 m, 3 m, and 7 m |
Junos OS Release 10.3 | 5 m | |
EX8200 40-port SFP+ line cards (EX8200-40XS) | Junos OS Release 10.3 | 1 m, 3 m, and 7 m |
Junos OS Release 11.1 | 5 m |
 | Note: We recommend that you use only Juniper Networks SFP+ direct attach cables with your 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 SFP+ 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 up to 10 Gbps.
Table 2 describes the cable specifications.
Table 2: SFP+ Direct Attach Cable Specifications
Model | Specification | Value |
|---|---|---|
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 through 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 | 3.3 ft (1 m) | |
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 through 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 | 9.9 ft (3 m) | |
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 through 85°C | |
Cable type | Twinax | |
Wire AWG | 24 AWG | |
Minimum cable bend radius | 1 in. | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 2% maximum | |
Time delay | 1.31 nsec/ft | |
Length | 16.4 ft (5 m) | |
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 through 85°C | |
Cable type | Twinax | |
Wire AWG | 24 AWG | |
Minimum cable bend radius | 1 in. | |
Cable characteristic impedance | 100 ohms | |
Crosstalk between pairs | 2% maximum | |
Time delay | 1.31 nsec/ft | |
Length | 23 ft (7 m) |
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
Related Documentation
- EX Series
- Optical Interface Support in EX3200 Switches
- Optical Interface Support in EX3300 Switches
- Optical Interface Support in EX4200 Switches
- Optical Interface Support in EX4500 Switches
- Optical Interface Support in EX8200 Switches
- Installing a Transceiver in an EX Series Switch
- Removing a Transceiver from an EX Series Switch
