Does this module support bidirectional communication over multi-mode fiber infrastructure?

No, this long-haul 40km SFP28 transceiver is strictly engineered and calibrated for single-mode fiber installations only.

Is this LS-BL273125-40C SFP28 module rated for harsh outdoor unconditioned node deployments?

This 25G transceiver module is rated for commercial operating temperatures (0°C to 70°C). If you want to deploy the module in unconditioned outdoor environments, you can select our industrial-grade LS-BL273125-40I module with a wide temperature range (-40°C to 85°C).

What is the typical power consumption of this 40km 25G SFP28 module under maximum data center traffic loads?

The LS-BL273125-40C BiDi optical module is engineered for high energy efficiency, operating comfortably with a low power consumption profile of less than 1.5W per unit.

Can I use this LS-BL273125-40C optical module on both ends of a single fiber link?

No, BiDi modules must always be deployed in complementary pairs. You must pair this Side A module (Tx1270nm/Rx1310nm) with a Side B module (Tx1310nm/Rx1270nm) at the remote end.

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Cisco SFP-25G23-BX40 Compatible LINK-PP 25G SFP28 BiDi 1270nm-TX/1310nm-RX 40km Simplex LC/UPC DOM SMF Optical Transceiver Module

Name: Cisco SFP-25G23-BX40 Compatible LINK-PP 25G SFP28 BiDi 1270nm-TX/1310nm-RX 40km Simplex LC/UPC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 217820
Price: 356.9 USD
Availability: InStock
Rating: 5 (33 reviews)

# 217820

Product: Cisco SFP-25G23-BX40 Compatible LINK-PP 25G SFP28 BiDi 1270nm-TX/1310nm-RX 40km Simplex LC/UPC DOM SMF Optical Transceiver Module
SKU: 217820
P/N: LS-BL273125-40C
Price: $ 415
Stock: 101 in Stock
Sold: 914
Product URL: https://www.l-p.com/products/494149.htm

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Manufacture: LINK-PP

P/N: LS-BL273125-40C

Compatible:: Cisco; LINK-PP; Arista; Brocade; DELL; 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-25G23-BX40 Compatible LINK-PP 25G SFP28 Specifications

SFP-25G23-BX40 is a hot-pluggable 25G SFP28 BiDi optical transceiver engineered for long-reach data transmission over single-mode fiber up to 40km, integrating a 1270nm DFB transmitter and a 1310nm APD receiver with built-in Digital Diagnostic Monitoring (DDM) to ensure deterministic signal integrity across a commercial operating temperature range of 0 to 70°C.

Cisco Part Number	SFP-25G23-BX40	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	0 to 70°C	Protocols	MSA Compliant, CPRI, eCPRI

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Q: Does this module support bidirectional communication over multi-mode fiber infrastructure? By D***t on 2026-04-11

A: No, this long-haul 40km SFP28 transceiver is strictly engineered and calibrated for single-mode fiber installations only. By admin on 2026-04-12
Q: Is this LS-BL273125-40C SFP28 module rated for harsh outdoor unconditioned node deployments? By B***n on 2026-02-07

A: This 25G transceiver module is rated for commercial operating temperatures (0°C to 70°C). If you want to deploy the module in unconditioned outdoor environments, you can select our industrial-grade LS-BL273125-40I module with a wide temperature range (-40°C to 85°C). By admin on 2026-02-08
Q: What is the typical power consumption of this 40km 25G SFP28 module under maximum data center traffic loads? By A***h on 2025-07-21

A: The LS-BL273125-40C BiDi optical module is engineered for high energy efficiency, operating comfortably with a low power consumption profile of less than 1.5W per unit. By admin on 2025-07-22
Q: Can I use this LS-BL273125-40C optical module on both ends of a single fiber link? By C***k on 2025-05-02

A: No, BiDi modules must always be deployed in complementary pairs. You must pair this Side A module (Tx1270nm/Rx1310nm) with a Side B module (Tx1310nm/Rx1270nm) at the remote end. By admin on 2025-05-03

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B***n

United States

Verified Purchase

5 .0

2026-03-16

Leasing dark fiber in metropolitan areas is incredibly expensive, so when our business needed to triple its data replication throughput between data centers, renting another fiber pair was cost-prohibitive. Deploying this BiDi single-mode SFP module allowed us to achieve 25Gbps bidirectional speeds over our existing single leased strand. The digital diagnostic monitoring (DDM) proved invaluable during staging, instantly showing us that our patch cord had a speck of dust causing high insertion loss. Once cleaned, RX power stabilized perfectly at -12dBm over our 31km link. (•‿•)✌️

127 Helpful vote Comments

J***n

United States

Verified Purchase

5 .0

2026-02-03

We completed a regional fiber loop expansion across three municipal buildings using single-strand single-mode fiber where our longest link spans approximately 34.6km with multiple old fusion splices. Thanks to the high-performance APD receiver design on these 25G SFP28 BiDi optical modules, the link maintained a solid lock without a single flap or frame drop under heavy load. The optical power budget is robust enough to easily handle real-world fiber attenuation and insertion loss. Total power consumption remained under 1.5W per module, keeping our edge switch stacks running cool in secondary distribution frames.

128 Helpful vote Comments

Z***n

United States

Verified Purchase

5 .0

2026-01-29

Deployed 20 of these SFP28 modules for our metro network ring upgrade, running stably at 25Gbps for weeks.

38 Helpful vote Comments

B***e

United States

Verified Purchase

5 .0

2025-12-19

Using these modules for a suburban base station backhaul deployment over a 28km stretch. The 25G BiDi SFP28 40km link budget leaves plenty of margin for splices and patch panels. Latency is virtually non-existent, fully matching eCPRI protocol specifications. Will definitely order more bulk batches for our phase 2 network rollout next quarter.

44 Helpful vote Comments

I***y

United States

Verified Purchase

5 .0

2025-11-07

Deploying 25G infrastructure for a carrier network upgrade requires strict compliance with wireless transport protocols, and we selected these 25G optical modules to handle CPRI Option 10 and eCPRI traffic profiles from BBU to RRH. With a max data rate of 25.78 Gbps, these transceivers handle high-bandwidth wireless fronthaul effortlessly across a 28km stretch. The single-mode fiber architecture combined with the 1270nm-TX/1310nm-RX configuration cut our dark fiber leasing overhead by exactly half across 45 cell sites. Built-in DDM data diagnostics allow to track optical power levels in real time and catching fiber bends before a full outage occurs.

149 Helpful vote Comments

R***n

Thailand

Verified Purchase

5 .0

2025-10-18

Thank you for the good quality, I like it very much.

54 Helpful vote Comments

D***y

United States

Verified Purchase

4 .0

2025-10-17

Always remember to order the matching opposite wavelength pair! The LS-BL273125-40C works perfectly as the upstream Side A (1270nm-TX/1310nm-RX). Make sure you don't forget to purchase the matching companion module (Side B: 1310nm-TX/1270nm-RX) for the remote end of the fiber link, otherwise your link won't establish! Wish there was a clear reminder bundle checkbox on the main checkout page. Optics are top tier though.

23 Helpful vote Comments

H***n

United States

Verified Purchase

5 .0

2025-09-21

Great value for high-density network deployments. Procured 50 pieces for our regional cloud node deployment. The price-to-performance ratio wipes the floor with original vendor pricing. Having a hot-swappable SFP28 form factor means zero downtime maintenance during our ongoing line expansions. These are truly outstanding transceiver modules.

116 Helpful vote Comments

B***v

Norway

Verified Purchase

5 .0

2025-09-05

Yes you can get this item for much cheaper elsewhere but who knows what kind of quality you\'re gonna be getting. And replacing that part and dealing network problems from low quality parts will cost you much more in the long run.

66 Helpful vote Comments

C***r

Ireland

Verified Purchase

5 .0

2025-08-23

High quality, and all product in the package worked correctly and were free of flaws.

41 Helpful vote Comments

R***w

Iran, Islamic Republic of

Verified Purchase

5 .0

2025-06-26

LINK-PP has been reliable with good products, good prices and Fast delivery. Never have any trouble with any purchases from LINK-PP.

49 Helpful vote Comments

K***n

United States

Verified Purchase

5 .0

2025-05-28

Procuring high-quality fiber transceivers in wholesale volume can be risky if compatibility is inconsistent, but after testing baseline samples of these LINK-PP 40km 25G BiDi optics transceivers, we placed a large commercial order. The technical consistency across the entire shipped lot was flawless, arriving in individual anti-static packaging with clear batch tracking labels. Out of all units deployed so far across our network expansion, we have experienced a 0% failure-out-of-box (DOA) rate. Our field technicians love how easily they click into our edge routers, and management appreciates the significant cost reduction.

115 Helpful vote Comments

M***r

Nigeria

Verified Purchase

5 .0

2025-05-18

The sales manager for my order was absolutely wonderful. She contacted me as soon as my order hit to verify all the information was correct for what I needed and answered any questions that I had. Impressed by their working efficiency.

56 Helpful vote Comments

C***s

United States

Verified Purchase

5 .0

2025-04-27

Great price, great product!

44 Helpful vote Comments

W***r

United States

Verified Purchase

5 .0

2025-04-08

Zero issues on a 35km long-haul link. Exactly what we needed for our regional data center interconnects. The 1270nm-TX/1310nm-RX pair is flawless.

42 Helpful vote Comments

H***n

United States

Verified Purchase

5 .0

2025-03-23

I found the website easy to navigate and your prices unbeatable. The product arrived post haste, Faster than I expected. Who can ask for any thing more.

51 Helpful vote Comments

D***s

Taiwan, Province of China

Verified Purchase

5 .0

2025-02-18

Spent almost three days looking for the items. Now I've got it! they are in new condition at a good price.

61 Helpful vote Comments

J***g

Belarus

Verified Purchase

5 .0

2025-01-22

The 1x1 Port SFP Cage was amazing, and the customer service was awesome and very responsive. I would highly recommend them.

41 Helpful vote Comments

G***y

Belgium

Verified Purchase

5 .0

2024-09-23

So far its been a great buying experience. Best price for my item and easy check out.

41 Helpful vote Comments

I***k

France

Verified Purchase

5 .0

2024-08-31

Unbeatable price. On time delivery. Well done!

47 Helpful vote Comments

V***i

United States

Verified Purchase

5 .0

2024-08-14

Always good experience at l-p.com. If not have to pay shipping fee, would be better.

66 Helpful vote Comments

A***V

Canada

Verified Purchase

5 .0

2024-02-28

Competitive prices. Site is easy to use. Fast shipping.

49 Helpful vote Comments

M***a

United States

Verified Purchase

5 .0

2024-02-08

I had an exceptional experience working with l-p.com. The Product was delivered very Fast and works like a charm.

83 Helpful vote Comments

F***n

Russian Federation

Verified Purchase

5 .0

2023-10-03

Fast shipping, excellent packaging, insanely prompt customer service.

21 Helpful vote Comments

A***r

Norway

Verified Purchase

5 .0

2023-10-02

As always, good products, easy ordering and Fast delivery.

44 Helpful vote Comments

J***M

Belgium

Verified Purchase

5 .0

2023-08-16

I worried about the quality at the begining. I used it soon after it came, just out of my expectation, quality is great!

97 Helpful vote Comments

D***n

Belgium

Verified Purchase

5 .0

2023-08-01

Delivery is always very quick and not once have I had a problem with the packaging.

52 Helpful vote Comments

R***a

Macao

Verified Purchase

5 .0

2023-07-28

I am very pleased with my purchase, although I had a few issues with it at first, everything is fine now.

50 Helpful vote Comments

K***m

United States

Verified Purchase

5 .0

2023-06-19

Amazing products, amazing prices and superFast delivery.

50 Helpful vote Comments

Y***n

Thailand

Verified Purchase

5 .0

2022-11-24

The ordering process was quick and easy, and I received my Transceiver Modules in just a few days. It was well made and worked with no issues!

42 Helpful vote Comments

R***h

Argentina

Verified Purchase

5 .0

2022-08-12

Very prompt, well packaged and very reasonably priced. A great service!

46 Helpful vote Comments

B***d

United States

Verified Purchase

5 .0

2022-05-28

Second time to order this Sfp Cage, used them to replace our previous one, work well and we are happy with them. I will have a look for the other products and see if we can get some also.

50 Helpful vote Comments

P***e

Cambodia

Verified Purchase

5 .0

2022-03-06

I had a great experience at l-p.com. They offer incredible Sfp Cage with an unbeatable price. Would recommend to anyone!

42 Helpful vote Comments