Our outdoor cabinets in Canada see temps from -35°C to +70°C. Is this module really rated for that kind of environment?

Yes, the LS-BL273125-40I is an industrial-grade 25G SFP28 BiDi module with a -40 to 85°C operating range. It’s already deployed in similar harsh outdoor telco cabinets.

Do I need to buy a matching module to complete the optical link?

Yes, this 1270nm-TX/1310nm-RX BiDi module must be paired with the complementary 1310nm-TX/1270nm-RX module on the other end.

Will this 1270nm/1310nm BiDi module work over existing OM4 multi-mode fiber patch cables?

No, the LS-BL273125-40I 25G BiDi module requires OS1/OS2 single-mode fiber and will not link up over OM3/OM4 multi-mode fiber.

Can I monitor the internal temperature and optical output of this transceiver in real-time via our SNMP monitoring software?

Yes, the built-in DOM/DDM function sends real-time temperature, voltage, Tx power, and Rx power readings directly to your network management system.

We run 25G CPRI for 5G up to 38km. Is this transceiver good for that?

Yes, it supports 25G Ethernet, CPRI, and eCPRI over 40km SMF. Many customers use it for 5G fronthaul and backhaul.

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HW 25GBase-BX-U4-I Compatible LINK-PP 25G SFP28 BiDi 1270nm-TX/1310nm-RX 40km Simplex LC/UPC DOM SMF Optical Transceiver Module (Industrial)

Name: HW 25GBase-BX-U4-I Compatible LINK-PP 25G SFP28 BiDi 1270nm-TX/1310nm-RX 40km Simplex LC/UPC DOM SMF Optical Transceiver Module (Industrial)
Brand: LINK-PP
SKU: 219534
Price: 368.08 USD
Availability: InStock
Rating: 4.9 (29 reviews)

# 219534

Product: HW 25GBase-BX-U4-I Compatible LINK-PP 25G SFP28 BiDi 1270nm-TX/1310nm-RX 40km Simplex LC/UPC DOM SMF Optical Transceiver Module (Industrial)
SKU: 219534
P/N: LS-BL273125-40I
Price: $ 428
Stock: 109 in Stock
Sold: 632
Product URL: https://www.l-p.com/products/491605.htm

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Manufacture: LINK-PP

P/N: LS-BL273125-40I

Compatible:: Cisco; LINK-PP; Arista; Brocade; FS; Generic; HW; Juniper; Mellanox

Compatible P/N:: 25GBase-BX-D | 10km; 25GBase-BX-U | 10km; SFP-25G-BXD1-I | 10km; SFP-25G-LR-BXU1-I | 10km; 25GBase-BX-U | 20km; SFP-25G-eLR-BXU1-I | 20km; 25GBase-BX-D4 | 40km; 25GBase-BX-D4-I | 40km; 25GBase-BX-U4 | 40km; 25GBase-BX-U4-I | 40km

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HW 25GBase-BX-U4-I Compatible LINK-PP 25G SFP28 Specifications

25GBase-BX-U4-I is an industrial-grade 25G SFP28 BiDi single-mode optical transceiver module engineered to sustain long-range 40km data links via a 1270nm-TX/1310nm-RX wavelength split while effortlessly enduring extreme thermal environments from -40°C to 85°C.

HW Part Number	25GBase-BX-U4-I	Vendor Name	LINK-PP
Form Factor	SFP28	Max Data Rate	25.78Gbps
Wavelength	1270nm-TX/1310nm-RX	Max Cable Distance	40km
Connector	Simplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	APD
TX Power	-1 to +7dBm	RX Power	-15 to +3dBm
Receiver Sensitivity	＜-19dBm	Receiver Overload	-7dBm
Operating Temperature Range	-40 to 85°C	Protocols	MSA Compliant, CPRI, eCPRI

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Q: Our outdoor cabinets in Canada see temps from -35°C to +70°C. Is this module really rated for that kind of environment? By S***e on 2026-05-21

A: Yes, the LS-BL273125-40I is an industrial-grade 25G SFP28 BiDi module with a -40 to 85°C operating range. It’s already deployed in similar harsh outdoor telco cabinets. By admin on 2026-05-22
Q: Do I need to buy a matching module to complete the optical link? By I***n on 2026-02-10

A: Yes, this 1270nm-TX/1310nm-RX BiDi module must be paired with the complementary 1310nm-TX/1270nm-RX module on the other end. By admin on 2026-02-11
Q: Will this 1270nm/1310nm BiDi module work over existing OM4 multi-mode fiber patch cables? By F***e on 2025-12-27

A: No, the LS-BL273125-40I 25G BiDi module requires OS1/OS2 single-mode fiber and will not link up over OM3/OM4 multi-mode fiber. By admin on 2025-12-28
Q: Can I monitor the internal temperature and optical output of this transceiver in real-time via our SNMP monitoring software? By Q***x on 2025-08-29

A: Yes, the built-in DOM/DDM function sends real-time temperature, voltage, Tx power, and Rx power readings directly to your network management system. By admin on 2025-08-30
Q: We run 25G CPRI for 5G up to 38km. Is this transceiver good for that? By B***l on 2025-03-30

A: Yes, it supports 25G Ethernet, CPRI, and eCPRI over 40km SMF. Many customers use it for 5G fronthaul and backhaul. By admin on 2025-03-31

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G***r

Netherlands

Verified Purchase

5 .0

2026-05-04

Tested on our CPRI base station tower link over 32km of fiber runs. The 1270nm-TX and 1310nm-RX optical budget was spot on, receiver APD sensitivity is top notch. Highly recommended for wireless backhaul!

85 Helpful vote Comments

C***y

Singapore

Verified Purchase

5 .0

2026-04-02

We needed a true industrial 25G SFP28 BiDi for a wind farm SCADA network. These modules run stably in our outdoor enclosures, even during cold nights. The DDM alarms help us detect fiber bends or dirty connectors before they cause outages.

98 Helpful vote Comments

I***e

Canada

Verified Purchase

5 .0

2026-03-15

These modules are perfect for upgrading legacy 10G BiDi routes to 25G without laying new fiber. The 40km SMF distance matches our existing links, and the simplex LC connector is the same. Minimal downtime during migration.

91 Helpful vote Comments

P***w

Thailand

Verified Purchase

5 .0

2026-02-18

We use these 25G BiDi optical modules in an industrial environment with extreme temperature swings. The operating range of -40 to 85°C is critical for our outdoor cabinets and unconditioned telco rooms. We monitored the modules through a full seasonal cycle: from -35°C winter nights to +70°C internal enclosure temps in summer. The link remained stable, with no flaps or SFP alarms. The TX power and receiver sensitivity stayed within spec, and the DDM temperature readings were accurate compared to our external sensors. For 25G SFP28 BiDi in harsh environments, this is one of the most reliable options we’ve tested.

134 Helpful vote Comments

M***d

United States

Verified Purchase

5 .0

2026-02-03

DOM data is accurate, making monitoring 25G links super easy.

52 Helpful vote Comments

G***d

France

Verified Purchase

5 .0

2026-01-27

No CRC errors after 2 weeks of 25G traffic stress test.

82 Helpful vote Comments

L***d

Australia

Verified Purchase

5 .0

2025-12-19

We use these LS-BL273125-40I for 25G base station backhaul. The 40km reach over simplex SMF fits our design perfectly, and the -40~85°C rating handles our rooftop cabinets without issues. The DOM interface shows clean TX/RX power and temperature, which our NOC team loves.

106 Helpful vote Comments

E***e

Austria

Verified Purchase

4 .0

2025-10-31

Great 25G SFP28 BiDi performance, but the delivery took a few days longer than expected due to customs handling. The modules themselves are perfect for our outdoor cabinets.

28 Helpful vote Comments

E***t

Republic of Korea

Verified Purchase

5 .0

2025-09-12

We ordered samples first, then scaled to 300+ units. The batch consistency is excellent: TX power, RX sensitivity, and BER are all within tight tolerances. LINK-PP’s testing program gives us confidence in large deployments.

74 Helpful vote Comments

I***n

Brazil

Verified Purchase

5 .0

2025-08-22

1270/1310nm pairing is perfect for our BiDi 40km design.

65 Helpful vote Comments

C***n

Italy

Verified Purchase

5 .0

2025-07-21

For outdoor 25G links, the -40~85°C rating is not just marketing. Our LS-BL273125-40I 25G SFP28 modules see direct sun and freezing nights, and the link stays stable. The sealed enclosure and quality optics make a real difference.

101 Helpful vote Comments

O***y

Canada

Verified Purchase

5 .0

2025-06-05

Fast shipping to Toronto, modules arrived in perfect condition.

63 Helpful vote Comments

D***r

India

Verified Purchase

5 .0

2025-05-30

For 25G fronthaul, we like the 1270/1310nm BiDi pairing. It matches our existing fiber plan and simplifies inventory. These BiDi modules show stable TX power between -1 and +7dBm, well within spec, even at 70°C.

83 Helpful vote Comments

S***a

Macao

Verified Purchase

5 .0

2025-04-12

They have a good selection of Optical Transceiver Modules and great customer service. Highly recommend.

83 Helpful vote Comments

N***d

Norway

Verified Purchase

4 .0

2025-04-07

The DOM data is accurate and the link is stable. My only complaint is that the delivery took a bit longer than expected. Otherwise, the 25G BiDi 40km performance is excellent.

31 Helpful vote Comments

H***n

Russian Federation

Verified Purchase

5 .0

2025-03-26

Upgraded our ISP aggregation backbones from 10G to 25G using existing single LC strands. The speed bump was immediate and latency dropped noticeably. Customer support helped confirm compatibility beforehand too!

117 Helpful vote Comments

N***g

United Kingdom

Verified Purchase

5 .0

2025-03-09

Stable link over single-mode fiber, even in -30°C weather.

77 Helpful vote Comments

K***g

Ukraine

Verified Purchase

5 .0

2024-11-04

Lowest price and items are always in stock.

14 Helpful vote Comments

X***a

United Kingdom

Verified Purchase

5 .0

2024-06-28

Super Fast shipping and order accurately filled. Great company!!

40 Helpful vote Comments

A***i

Netherlands

Verified Purchase

5 .0

2024-01-30

Not the best pricing on the web, but they had the availability I needed and shipped quickly.

21 Helpful vote Comments

V***i

Brunei Darussalam

Verified Purchase

5 .0

2024-01-09

I have hesitated to order it because of price(7k), so when I got to know the latest price in the early of Sep, I order one piece to test, all is fine. Link-pp is our first choice.

39 Helpful vote Comments

R***S

Australia

Verified Purchase

5 .0

2023-11-17

This product is used very well.

19 Helpful vote Comments

B***f

Norway

Verified Purchase

5 .0

2023-09-30

The live chat function was helpful in selecting the compatible 10/25/40G Transceiver Modules module which was later purchased through l-p.com. Staff is very well informed and articulate. They are always reliable, quick, and accurate - very happy with l-p.com!

13 Helpful vote Comments

S***r

Singapore

Verified Purchase

5 .0

2023-07-16

First purchase a very pleasant experience

46 Helpful vote Comments

C***n

Hong Kong

Verified Purchase

5 .0