Juniper QFX-QSFP-40G-SR4 · 740-067442

MPN / P/N

740-067442

Manufacturer model

QFX-QSFP-40G-SR4

Part Number

740-067442

Speed

40 Gigabit Ethernet

Breakout Capable

No

Form Factor

QSFP+

Product Type

Optical Transceiver

Connector

MPO-12 PC/UPC

Monitoring Available

Yes

Digital Optical Monitoring

Yes

40GBASE-SR4 / Cable type

MMF

40GBASE-SR4 / Core size/cladding

50/125 µm | 50/125 µm

40GBASE-SR4 / Diagnostic support

Laser bias current–supported RX input power–supported Case temperature–supported Power supply voltage–supported Laser output power–not supported

40GBASE-SR4 / Distance

100 m | 150 m

40GBASE-SR4 / Effective modal bandwidth

2000 MHz x km | 4700 MHz x km

40GBASE-SR4 / Fiber grade

OM3 | OM4

40GBASE-SR4 / Maximum Power consumption (W)

3.5 W

40GBASE-SR4 / Operating Temperature (range)

0° C to 70° C

40GBASE-SR4 / Optical Transmitter 3-dB spectral width (maximum)

0.65 nm

40GBASE-SR4 / Receive lane wavelengths (range)

840 nm to 860 nm

40GBASE-SR4 / Receiver input power, each lane (maximum)

2.4 dBm

40GBASE-SR4 / Receiver input power, each lane (minimum)

-9.5 dBm

40GBASE-SR4 / Signaling rate, each lane

40 Gbps

40GBASE-SR4 / Storage temperature

–40° C to 85° C

40GBASE-SR4 / Transmitter fibers

12

40GBASE-SR4 / Transmitter output power, each lane (maximum)

2.4 dBm (per lane)

40GBASE-SR4 / Transmitter output power, each lane (minimum)

–7.6 dBm (per lane)

40GBASE-SR4 / Transmitter wavelengths (range)

850 nm

Documented selection limits

Reach, rate, form factor and breakout support apply only to the listed standard/mode, fiber grade and platform/port configuration. Keep source qualifiers for FEC, attenuation, transmit/receive limits, temperature, active/passive operation and cable ends. Check Juniper HCT for the exact host, interface module, port mode, Junos release, required QSA adapter and qualifications before ordering. Do not infer universal interoperability or combine power/temperature/reach across model profiles. Optical link budgets are not calculated or inferred. Parallel fiber/core/modal-bandwidth/distance values retain the same source column order; correlate matching columns instead of applying the largest distance to every fiber.

Reading parallel values

Pipe-separated fiber, bandwidth and reach values correspond by position in the original manufacturer column order. The longest reach does not apply to every fiber type.

Specification source: Juniper ↗
Checked against documentation: 19.10.2026