Does the SFP-25GBX-D-20 transceiver module require a pair of fibers to operate?

No, it is a BiDi (Bi-Directional) transceiver that transmits and receives data over a single strand of simplex fiber.

What are the exact optical wavelengths used by this module?

The SFP-25GBX-D-20 SFP28 BiDi optical module uses a wavelength split of 1330nm for transmitting (TX) and 1270nm for receiving (RX).

Is the management interface compliant with industry standards?

Yes, it features a 2-wire management interface that is fully compliant with the SFF-8472 specification.

What should I do if the DOM readings show an optical power alarm?

Inspect the fiber patch cord ends for dirt, clean the LC/UPC connector using an optical cleaning tool, and verify that the link budget does not exceed 20km.

Since our server racks get pretty packed and hot, how does the built-in DOM function help us keep track of the internal temperature?

The SFF-8472 compliant DOM telemetry reports real-time module temperature, laser bias current, and supply voltage directly to your SNMP monitoring dashboard.

Does this 25G module run very hot, and will it affect the cooling efficiency inside a fully packed switch chassis?

This module features low power consumption (typically under 1.5W), designed to dissipate heat efficiently without placing an extra thermal load on standard switch fans.

We already have standard OS2 single-mode fiber cables laid out in our building. Will this module work with them, and what kind of patch cable do we need?

Yes, it works perfectly with standard OS2 single-mode fiber. Since this is a BiDi module, you just need to make sure you use a Simplex LC cable instead of a standard dual-fiber duplex patch cord.

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Cisco SFP-25GBX-D-20 Compatible LINK-PP 25G SFP28 BiDi 1330nm-TX/1270nm-RX 20km Simplex LC/UPC DOM SMF Optical Transceiver Module

Name: Cisco SFP-25GBX-D-20 Compatible LINK-PP 25G SFP28 BiDi 1330nm-TX/1270nm-RX 20km Simplex LC/UPC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 218274
Price: 39.99 USD
Availability: InStock
Rating: 5 (20 reviews)

# 218274

Product: Cisco SFP-25GBX-D-20 Compatible LINK-PP 25G SFP28 BiDi 1330nm-TX/1270nm-RX 20km Simplex LC/UPC DOM SMF Optical Transceiver Module
SKU: 218274
P/N: LS-BL332725-20C
Price: $ 46.5
Stock: 1102 in Stock
Sold: 1K
Product URL: https://www.l-p.com/products/476631.htm

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Manufacture: LINK-PP

P/N: LS-BL332725-20C

Compatible:: Cisco; LINK-PP; Arista; Brocade; Dell; Intel; 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-25GBX-D-20 Compatible LINK-PP 25G SFP28 Specifications

Cisco SFP-25GBX-D-20 Compatible LINK-PP module is a 25G SFP28 BiDi single-mode optical transceiver engineered for 20km data transmission via a simplex LC/UPC connector, utilizing a dual 1330nm-TX/1270nm-RX wavelength split and supporting DOM functionality within a standard 0°C to +70°C commercial operating temperature range.

Cisco Part Number	SFP-25GBX-D-20	Vendor Name	LINK-PP
Form Factor	SFP28	Max Data Rate	25.78Gbps
Wavelength	1330nm-TX/1270nm-RX	Max Cable Distance	20km
Connector	Simplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
TX Power	-1 to +7dBm	RX Power	-15 to +3dBm
Receiver Sensitivity	＜-14dBm	Receiver Overload	2dBm
Operating Temperature Range	0 to 70°C	Protocols	eCPRI, SFF-8472, SFF-8432, SFF-8431

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Q: Since our server racks get pretty packed and hot, how does the built-in DOM function help us keep track of the internal temperature? By A***e on 2026-04-28

A: The SFF-8472 compliant DOM telemetry reports real-time module temperature, laser bias current, and supply voltage directly to your SNMP monitoring dashboard. By admin on 2026-04-29
Q: Does this 25G module run very hot, and will it affect the cooling efficiency inside a fully packed switch chassis? By V***e on 2025-09-29

A: This module features low power consumption (typically under 1.5W), designed to dissipate heat efficiently without placing an extra thermal load on standard switch fans. By admin on 2025-09-30
Q: We already have standard OS2 single-mode fiber cables laid out in our building. Will this module work with them, and what kind of patch cable do we need? By L***n on 2025-02-16

A: Yes, it works perfectly with standard OS2 single-mode fiber. Since this is a BiDi module, you just need to make sure you use a Simplex LC cable instead of a standard dual-fiber duplex patch cord. By admin on 2025-02-17

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D***r

Macao

Verified Purchase

5 .0

2026-05-09

Replaced legacy 10G SFP+ BiDi optics with these 25G SFP28 20km modules during a scheduled maintenance window. Hot-swapping was effortless with zero impact on neighboring active ports. Transmit and receive path optical isolation is top-notch.

80 Helpful vote Comments

C***t

Saudi Arabia

Verified Purchase

5 .0

2026-04-25

Hot-pluggable design saved us maintenance downtime during our live network upgrade.

47 Helpful vote Comments

L***y

Maldives

Verified Purchase

5 .0

2026-01-22

Operating a regional ISP network requires getting maximum performance out of every single-strand fiber lease. We installed these 20km BiDi SFP28 optical modules across multiple remote aggregation nodes to double our available backhaul bandwidth. Compatibility was flawless across our multi-vendor router fleet, with all boards loading the SFP28 MSA compliant settings instantly. Even over our longest 18.5km span, the DFB laser punched through attenuation effortlessly. Internal temperatures stayed around 40°C under heavy traffic, making this an ultra-reliable optics transceiver for high-capacity telecom links.

102 Helpful vote Comments

C***e

Chile

Verified Purchase

5 .0

2025-12-21

Clean 1330/1270nm wavelength separation with zero cross-talk on long-haul routes.

71 Helpful vote Comments

R***n

Morocco

Verified Purchase

5 .0

2025-11-12

Our enterprise campus covers multiple buildings across a public road with limited leased fiber strands. Switching our links from dual-strand to 25G BiDi saved us substantial monthly dark fiber leasing fees. Solid metal casing dissipates heat effectively inside dense switch enclosures.

93 Helpful vote Comments

V***w

Israel

Verified Purchase

5 .0

2025-09-17

We needed to double our bandwidth between two data halls 16km apart without laying new fiber. Ordered a batch of these LS-BL332725-20C 25G BiDi modules paired with the matching 1270TX/1330RX modules. They synced instantly across our multi-vendor switches. Optical RX power came in clean at -8.2 dBm. Incredible value for data center interconnects!

88 Helpful vote Comments

J***s

Brunei Darussalam

Verified Purchase

5 .0

2025-07-08

Upgrading our university campus backbone to 25GbE over existing single-strand fiber patch panels went seamlessly with these modules. The optical isolation between the 1330nm transmit and 1270nm receive channels is remarkably sharp, eliminating crosstalk across our 15km inter-building links. The metal casing feels high-grade, featuring a smooth bail-latch mechanism that secures firmly into high-density 25G switch ports. SNMP telemetry queries report accurate real-time metrics for supply voltage, laser bias current, and operating temperatures. It provides excellent transmission stability and high compatibility for modern campus infrastructure upgrades.

118 Helpful vote Comments

S***g

Ukraine

Verified Purchase

5 .0

2025-05-29

Real-time DOM telemetry works like a charm for monitoring optical power metrics.

66 Helpful vote Comments

O***y

Libyan Arab Jamahiriya

Verified Purchase

4 .0

2025-03-05

Overall very satisfied with the optical performance and build quality. The only drawback was the longer delivery time, which might be a consideration for urgent projects.

28 Helpful vote Comments

J***o

Sweden

Verified Purchase

5 .0

2024-05-31

Pleasantly surprised!! Great store. I will do business with them again. Good prices and quick ship!!

77 Helpful vote Comments

K***i

Ireland

Verified Purchase

5 .0

2024-04-20

I'm very happy with my transaction and purchase. The Optical Transceiver Module works with no issue. I would definitely recommend this company for customer service and speed. I will be purchasing from them again in the future.

99 Helpful vote Comments

J***e

United Arab Emirates

Verified Purchase

5 .0

2024-04-17

I received my order very Fast and in excellent condition. The 10/25/40G Transceiver Modules and Lan Transformer were exactly as stated and well packaged. I'll test them tomorrow and reedit the review.

55 Helpful vote Comments

M***i

Brunei Darussalam

Verified Purchase

5 .0

2024-03-28

All OK

85 Helpful vote Comments

L***u

Belarus

Verified Purchase

5 .0