Juniper JNP-QSFP-40G-LX4 · 740-056705

MPN / P/N

740-056705

Manufacturer model

JNP-QSFP-40G-LX4

Part Number

740-056705

Speed

40 Gigabit Ethernet

Breakout Capable

No

Form Factor

QSFP+

Product Type

Optical Transceiver

Connector

Duplex LC PC/UPC

Monitoring Available

Yes

Digital Optical Monitoring

Yes

40GBASE-LX4 / Cable type

SMF | MMF | MMF

40GBASE-LX4 / Core size/cladding

9/125 µm | 50/125 µm | 50/125 µm

40GBASE-LX4 / Distance

2 km | 100 m | 150 m

40GBASE-LX4 / Effective modal bandwidth

— | 2000 MHz x km | 4700 MHz x km

40GBASE-LX4 / Fiber grade

OS1 | OM3 | OM4

40GBASE-LX4 / Maximum Power consumption (W)

3.5 W

40GBASE-LX4 / Operating Temperature (range)

0° C to 70° C

40GBASE-LX4 / Receive lane wavelengths (range)

Lane 0–1271 nm Lane 1–1291 nm Lane 2–1311 nm Lane 3–1331 nm

40GBASE-LX4 / Receiver input power, each lane (maximum)

SMF 2.3 dBm MMF 4.3 dBm

40GBASE-LX4 / Receiver input power, each lane (minimum)

–11.5 dBm (per lane)

40GBASE-LX4 / Signaling rate, each lane

40 Gbps (10Gbps per Lane)

40GBASE-LX4 / Storage temperature

–40° C to 85° C

40GBASE-LX4 / Transmitter fibers

Dual

40GBASE-LX4 / Transmitter output power, each lane (maximum)

SMF 2.3 dBm MMF 4.3 dBm

40GBASE-LX4 / Transmitter output power, each lane (minimum)

–7.0 dBm (per lane)

40GBASE-LX4 / Transmitter wavelengths (range)

Lane 0–1271 nm Lane 1–1291 nm Lane 2–1311 nm Lane 3–1331 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