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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Cisco SFP-25G-BX40U-I Compatible LINK-PP 25G SFP28 BiDi 1270nm-TX/1310nm-RX 40km Simplex LC/UPC DOM SMF Optical Transceiver Module (Industrial)

Name: Cisco SFP-25G-BX40U-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: 219531
Price: 368.08 USD
Availability: InStock
Rating: 5 (30 reviews)

# 219531

Product: Cisco SFP-25G-BX40U-I Compatible LINK-PP 25G SFP28 BiDi 1270nm-TX/1310nm-RX 40km Simplex LC/UPC DOM SMF Optical Transceiver Module (Industrial)
SKU: 219531
P/N: LS-BL273125-40I
Price: $ 428
Stock: 142 in Stock
Sold: 534
Product URL: https://www.l-p.com/products/494271.htm

For Order Over $1000 Get $15.00 Off , Code: Linkpp15

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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:: SFP-25G-BXD-I | 10km; SFP-25GBX-D-10 | 10km; SFP-25GBX-U-10 | 10km; SFP28-25G-BX-I | 10km; SFP-25G32-BX20-I | 20km; SFP-25GBX-D-20 | 20km; SFP-25GBX-U-20 | 20km; SFP28-25G-BX20-I | 20km; SFP-25G-BX40D-I | 40km; SFP-25G-BX40U-I | 40km; SFP-25G23-BX40 | 40km; SFP-25GBX-D-40 | 40km

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Cisco SFP-25G-BX40U-I Compatible LINK-PP 25G SFP28 Specifications

SFP-25G-BX40U-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.

Cisco Part Number	SFP-25G-BX40U-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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J***e

Germany

Verified Purchase

5 .0

2026-05-11

Simplex LC saved our fiber count on long campus backbones.

48 Helpful vote Comments

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

L***h

Indonesia

Verified Purchase

5 .0

2026-04-23

In a 25G dark fiber service offering, we needed modules that could guarantee performance over long distances. The LS-BL273125-40I’s 40km reach and APD receiver make it ideal for this use case. We tested with 25G traffic generators and saw no packet loss or jitter issues. The DOM data is accurate and stable, which helps our operations team monitor the links. Our customers see full 25G performance, and we’ve had zero complaints since deploying these modules.

110 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

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

E***e

New Zealand

Verified Purchase

5 .0

2025-11-14

Perfect 25G BiDi module for our 37km single-mode fiber runs, zero packet loss.

39 Helpful vote Comments

N***t

South Africa

Verified Purchase

5 .0

2025-10-26

Great products

29 Helpful vote Comments

F***d

Spain

Verified Purchase

5 .0

2025-10-08

We use these BiDi SFP28 modules for 25G dark fiber services between two enterprise campuses. Customers see full 25G performance, and our monitoring shows clean optical levels. The 25Gbps rate is exactly what we need for Ethernet and CPRI.

109 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

A***n

Mexico

Verified Purchase

5 .0

2025-08-04

In a 25G data center interconnect project, we needed to connect two buildings 35km apart with minimal fiber count. The simplex LC BiDi design was perfect, cutting fiber usage in half versus duplex 25GBASE-LR. We deployed 48 pairs of these BiDi modules between two 25G aggregation switches. All links established at 25Gbps, and the DOM data is consistent across all ports. Power draw is low, which helps in our dense cages.

122 Helpful vote Comments

D***k

United States

Verified Purchase

5 .0

2025-08-02

Used these in outdoor NEMA enclosures for a solar farm project in Arizona. Ambient temps inside the enclosure reach 65°C easily, but module temp stayed well within spec. Reliable hardware for extreme environments!

80 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

J***t

Sweden

Verified Purchase

5 .0

2025-06-28

We integrated these modules into a 25G ring topology for a municipal fiber network. The ring uses 25G BiDi links of varying reaches (10km, 20km, 40km) to connect different nodes. The LS-BL273125-40I handles the longest spans without problems. The DDM alarms allow us to detect fiber degradation early, and the industrial temperature rating ensures stability in outdoor cabinets. The 25.78Gbps data rate supports both Ethernet and CPRI traffic, which is exactly what we need for our converged network.

156 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

C***s

Japan

Verified Purchase

5 .0

2025-04-18

Industrial temp rating is legit, stable in our outdoor cabinet.

67 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

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