Will a 1311nm 50G optic talk to a 1310nm 10G or 25G module at the far end?

No. The wavelengths are close, but the line rate and the modulation are different, so the two ends will not train. Both ends of a link must run the same 50G mode on a single lane; mixing in an older 10G or 25G optic gives you no link at all, not a slower one. Check the far end part number before ordering spares. If you need to reach legacy gear, put a switch or a media converter in the path instead of expecting the optics to negotiate down.

Can our NMS read TX and RX power from the DOM on this module?

Yes. The module supports DDM/DOM, so the host can poll launch power, receive power and case temperature. We recommend recording a baseline for each serial at goods in and setting your alarm thresholds relative to that number rather than to the absolute datasheet limit, because a slow drift is more useful than a single out of range alert. If your NMS only reads the vendor name field, check that it supports the DOM pages before you rely on it.

Does this 50G QSFP28 run as one lane or four, and what does the host port need?

It is a single 1311nm lane, not four parallel lanes, so the host port has to support the 50G rate on a QSFP28 electrical interface. Check the switch datasheet for that mode before ordering, because a port that only does 4x25G will not train on a single lane module. The SFF-8665 host side and the MSA EEPROM are standard, so no vendor unlock is needed on a compatible switch. Duplex LC is all you need on the fibre side.

Is the 10km reach realistic on our existing singlemode plant, and what should we measure?

Measure the span first. A 1311nm 50G link has a defined power budget, and patch panels, splices and old connectors all eat into it; an OTDR trace at 1310nm gives you the real loss including those. Our ten kilometre figure assumes clean LC ferrules and fibre that meets the usual singlemode spec. If the measured loss is close to the limit, clean or replace the patch cords rather than adding an amplifier. We can share the TX power and sensitivity figures from the datasheet.

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LINK-PP LQ-SM3150-LR1C 50G QSFP28 1311nm 10km Duplex LC SMF Transceiver Module

Name: LINK-PP LQ-SM3150-LR1C 50G QSFP28 1311nm 10km Duplex LC SMF Transceiver Module
Brand: LINK-PP
SKU: 227954
Price: 719.00 USD
Availability: InStock
Rating: 5 (37 reviews)

Product: LINK-PP LQ-SM3150-LR1C 50G QSFP28 1311nm 10km Duplex LC SMF Transceiver Module
SKU: 227954
P/N: LQ-SM3150-LR1C
Price: $ 719.00
Stock: 80 in Stock
Sold: 920
Product URL: https://www.l-p.com/products/491591.htm

37 Reviews

4 Questions

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Unit price $ 719.00

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Manufacture: LINK-PPP/N: LQ-SM3150-LR1CSKU: 227954

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Compatible P/N:: LQ-SM3150-LR1C| 10km

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LINK-PP LQ-SM3150-LR1C 50G QSFP28 LR1 Optical Transceiver Module (SMF, 1310nm, 10km, Duplex LC, DOM)

LINK-PP LQ-SM3150-LR1C is a QSFP28 optical transceiver compliant with QSFP28, SFF-8665 Rev1.9, SFF-8636 Rev2.9, IEEE 802.3cd_D3p5 50GBASE-LR and IEEE 802.3 50GAUI-2 C2M standards. Powered by single 3.3V supply with max 3.5W power draw, it uses DML laser & PIN receiver, duplex LC connector, two-wire serial interface and DDM, fully RoHS compliant per EU 2011/65/EU.

LINK-PP Part Number	LQ-SM3150-LR1C	Vendor Name	LINK-PP
Form Factor	QSFP28	Max Data Rate	53.125Gbps
Max Wavelength	1311nm	Max Cable Distance	10km
Connector	Duplex LC	Media	SMF
Transmitter Type	DML laser	Receiver Type	PIN
DDM/DOM	Supported	Operating Temperature Range	0°C to +70°C
Protocols	MSA Compliant	Warranty	5 Years

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Q:
Will a 1311nm 50G optic talk to a 1310nm 10G or 25G module at the far end? by G***g

A:
No. The wavelengths are close, but the line rate and the modulation are different, so the two ends will not train. Both ends of a link must run the same 50G mode on a single lane; mixing in an older 10G or 25G optic gives you no link at all, not a slower one. Check the far end part number before ordering spares. If you need to reach legacy gear, put a switch or a media converter in the path instead of expecting the optics to negotiate down. by LINK-PP Technical Support
Q:
Can our NMS read TX and RX power from the DOM on this module? by T***d

A:
Yes. The module supports DDM/DOM, so the host can poll launch power, receive power and case temperature. We recommend recording a baseline for each serial at goods in and setting your alarm thresholds relative to that number rather than to the absolute datasheet limit, because a slow drift is more useful than a single out of range alert. If your NMS only reads the vendor name field, check that it supports the DOM pages before you rely on it. by LINK-PP Technical Support
Q:
Does this 50G QSFP28 run as one lane or four, and what does the host port need? by L***n

A:
It is a single 1311nm lane, not four parallel lanes, so the host port has to support the 50G rate on a QSFP28 electrical interface. Check the switch datasheet for that mode before ordering, because a port that only does 4x25G will not train on a single lane module. The SFF-8665 host side and the MSA EEPROM are standard, so no vendor unlock is needed on a compatible switch. Duplex LC is all you need on the fibre side. by LINK-PP Technical Support
Q:
Is the 10km reach realistic on our existing singlemode plant, and what should we measure? by A***r

A:
Measure the span first. A 1311nm 50G link has a defined power budget, and patch panels, splices and old connectors all eat into it; an OTDR trace at 1310nm gives you the real loss including those. Our ten kilometre figure assumes clean LC ferrules and fibre that meets the usual singlemode spec. If the measured loss is close to the limit, clean or replace the patch cords rather than adding an amplifier. We can share the TX power and sensitivity figures from the datasheet. by LINK-PP Technical Support

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E***e

Romania

Verified Purchase

5.0

2026-11-05

One 1311nm lane in a QSFP28 shell, seated on the first push.

70 Helpful Comments

M***i

Malaysia

Verified Purchase

5.0

2026-11-05

Duplex LC pair, so one fibre each way.

90 Helpful Comments

A***n

Argentina

Verified Purchase

5.0

2026-11-05

Our acceptance sheet now has three DOM fields on it: TX power, RX power and case temperature, each logged with the module serial before it goes into stock. On the last batch the launch values sat inside a 0.8dB window and the reported temperature tracked the chassis sensor within two degrees. We set alarm thresholds from those baselines rather than from the datasheet maximum, which has caught one degrading patch cord before it turned into a link flap. Being able to read the numbers over the host is the reason we chose a monitored module.

86 Helpful Comments

A***e

South Africa

Verified Purchase

5.0

2026-11-05

Before fitting the module we measured the span with an OTDR at 1310nm and got 3.1dB end to end including two patch panels, which leaves comfortable room against the 10km budget. We then scoped both LC ferrules, cleaned one with a cassette, and logged the DOM TX and RX values at the near end. A 48 hour soak at full rate produced no FEC corrections and no drift in the reported launch value. At 50G a dirty ferrule costs more margin than an extra connector in the path.

60 Helpful Comments

T***t

Hungary

Verified Purchase

5.0

2026-11-03

The SFF-8665 host side matched the cage we already had, so the module slid in and the EEPROM was read on the first boot; no vendor specific unlock was needed :)