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QSFP+ Direct Attach Cables for EX Series Switches

Quad small form-factor pluggable plus (QSFP+) direct attach copper cables are suitable for in-rack connections between QSFP+ ports of EX Series switches. They are suitable for short distances of up to 16.4 ft (5 m), making them ideal for highly cost-effective networking connectivity within a rack and between adjacent racks. See Figure 37.

Figure 37: QSFP+ Direct Attach Cables for EX Series Switches

QSFP+ Direct Attach
Cables for EX Series Switches

This topic describes:

Cable Specifications

QSFP+ passive direct attach cables are hot-removable and hot-insertable. A cable consists of a cable assembly that connects directly into two QSFP+ 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 40 Gbps. Passive direct attach cables have no signal amplification built into the cable assembly.

Table 54 describes the support for QSFP+ passive direct attach cable lengths on EX Series switches for Junos OS releases.

Table 54: Software Support for QSFP+ Passive Direct Attach Cables for EX Series Switches

Switch

Software Support Added

DAC Model Number

EX4300 switches

  • EX4300-24T, EX4300-24P, EX4300-48T, EX4300-48T-AFI, EX4300-48P, EX4300-48T-DC, and EX4300-48T-DC-AF switches—Junos OS for EX Series switches, Release 13.2X50-D10 or later
  • EX4300-32F switches—Junos OS for EX Series switches, Release 13.2X51-D15 or later
  • EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-48T-S, and EX4300-48P-S switches—Junos OS for EX Series switches, Release 13.2X51-D26 or later
  • EX-QSFP-40GE-DAC-50CM
  • QFX-QSFP-DAC-1M
  • QFX-QSFP-DAC-3M
  • JNP-QSFP-DAC-5M

EX4550 switches

  • EX4550-32T-AFI, EX4550-32T-AFO, EX4550-32T-DC-AFI, EX4550-32T-DC-AFO, EX4550-32F-AFI, EX4550-32F-AFO, EX4550-32F-DC-AFI, and EX4550-32F-DC-AFO switches—Junos OS for EX Series switches, Release 13.2X50-D10 or later
  • EX4550-32F-S switches—Junos OS for EX Series switches, Release 12.3R5 or later
  • EX-QSFP-40GE-DAC-50CM
  • QFX-QSFP-DAC-1M
  • QFX-QSFP-DAC-3M
  • JNP-QSFP-DAC-5M

Note: We recommend that you use only QSFP+ direct attach cables purchased from Juniper Networks with your Juniper Networks device.

Caution: If you are having a problem running a Juniper Networks device that is using 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.

Table 55 describes the cable specifications.

Table 55: QSFP+ Direct Attach Cable Specifications

Model Number

Specification

Value

EX-QSFP-40GE-DAC-50CM

Rate

40-Gbps full-duplex serial transmission

Connector type

QSFP+ passive Twinax cable assembly

Supply voltage

3.3 V

Power consumption (per end)

0.015 W

Storage temperature

–40°C through 85°C

Cable type

Twinax

Wire AWG

30 AWG

Minimum cable bend radius

2.54 cm (1 in.)

Cable characteristic impedance

100 ohms

Crosstalk between pairs

1% maximum

Time delay

4.3 nsec/ft

Length

0.5 m (1.6 ft)

QFX-QSFP-DAC-1M

Rate

40-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 through 85°C

Cable type

Twinax

Wire AWG

30 AWG

Minimum cable bend radius

2.54 cm (1 in.)

Cable characteristic impedance

100 ohms

Crosstalk between pairs

1% maximum

Time delay

4.3 nsec/ft

Length

1 m (3.28 ft)

QFX-QSFP-DAC-3M

Rate

40-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 through 85°C

Cable type

Twinax

Wire AWG

30 AWG

Minimum cable bend radius

2.54 cm (1 in.)

Cable characteristic impedance

100 ohms

Crosstalk between pairs

1% maximum

Time delay

4.3 nsec/ft

Length

3 m (9.84 ft)

JNP-QSFP-DAC-5M

Rate

40-Gbps full-duplex serial transmission

Connector type

QSFP+ passive Twinax cable assembly

Supply voltage

3.3 V

Power consumption (per end)

0.015 W

Storage temperature

–40°C through 85°C

Cable type

Twinax

Wire AWG

26 AWG

Minimum cable bend radius

2.54 cm (1 in.)

Cable characteristic impedance

100 ohms

Crosstalk between pairs

1% maximum

Time delay

4.3 nsec/ft

Length

5 m (16.4 ft)

Related Documentation

Modified: 2015-06-23