Will the DOM laser bias current readings stay accurate if my network closet gets up to 45°C?

Yes, the built-in DOM microchip is calibrated to report accurate real-time telemetry across its entire 0°C to 70°C operating window.

Do these 155M SFP modules support hot-swapping, or do I need to reboot my edge router to get the system to recognize the module?

They are fully hot-pluggable. You can swap them live without interrupting the rest of your rack's traffic.

Can I use a standard single-mode Duplex LC patch cord with this transceiver if the run is very short?

No, this is an MMF (multimode) transceiver utilizing a 1310nm FP laser designed specifically for multi-mode fiber cores.

We accidentally ordered a single-mode patch cord. Can we use a mode-conditioning cable to make this 155M multi-mode SFP module work over it?

Mode-conditioning cables are meant for the opposite scenario (SMF optics over MMF). For this module, you must use a dedicated duplex LC multi-mode fiber patch cord.

Does this transceiver support old-school OC-3 ATM telecom links, or is it strictly for Fast Ethernet?

It supports both! The 155Mbps physical layer rate is perfectly timed for both Fast Ethernet (100BASE-FX) and SONET legacy equipment.

Breadcrumb: Home; Products; Optics Transceivers | SFP Modules; 1/2/4G Transceiver Modules; 100M SFP; 212912

Click to open expanded view

3Com 3CSFP81 Compatible LINK-PP 155M SFP 1310nm 2km Duplex LC DOM MMF Optical Transceiver Module

Name: 3Com 3CSFP81 Compatible LINK-PP 155M SFP 1310nm 2km Duplex LC DOM MMF Optical Transceiver Module
Brand: LINK-PP
SKU: 212912
Price: 4.902 USD
Availability: InStock
Rating: 4.9 (14 reviews)

# 212912

Product: 3Com 3CSFP81 Compatible LINK-PP 155M SFP 1310nm 2km Duplex LC DOM MMF Optical Transceiver Module
SKU: 212912
P/N: LS-MM3101-02C
Price: $ 5.7
Stock: 685 in Stock
Sold: 1.5K
Product URL: https://www.l-p.com/products/493859.htm

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

For Order Over $3000 Get $50.00 Off , Code: Linkpp50

For Order Over $5000 Get $100.00 Off , Code: Linkpp100

New Users: $10 Coupon for Orders , Code: linkpp2610

14 Reviews

5 Questions

Request Stock

1.5K Sold

$ 5.7

Free shipping over $600, If you need a more favorable price, please contact us directly.

Qty (pcs) :

Unit Price :

$ 5.7

100

$ 5.415

1000

$ 5.244

3000

$ 5.073

6000

$ 4.902

Manufacture: LINK-PP

P/N: LS-MM3101-02C

Compatible:: Cisco; LINK-PP; 3Com; Arista Networks; Avaya; Brocade; Dell; Extreme Networks; FS; H3C; HPE; HPE H3C; HPE ProCurve; Hirschmann

Compatible P/N:: 3CSFP81 | 2km

Shipping:

To Be Negotiated

Free Shipping

Can't deliver

to United States via {{now_chooseship?now_chooseship.name:''}}

Estimated delivery time : {{now_chooseship?now_chooseship.datemin:''}}-{{now_chooseship?now_chooseship.datemax:''}} days. See details

5-Year Warranty 30-Day Returns 30-Day Exchange

Stock:

{{parseInt(detail_data.left_num) ? detail_data.left_num +' in Stock' :detail_data.zeroStockOrder==0?'Out of Stock':'Available'}} .

Quantity:

( Min. Order {{detail_data.prodInfo.minimum_ordered_quantity}} )

undeliverable

Total Price:

{{ detail_data.displayed_price.unit_prefix }} {{ detail_data.displayed_price.original_total_price }} ( {{ detail_data.displayed_price.rate_of_discount }}% OFF ) {{detail_data.displayed_price.ex_sell_type}}

Add to wish

Specifications

Specification
Videos
Matching Products
Download
Q&A
Customer Reviews

3Com 3CSFP81 Compatible LINK-PP 155M SFP Specifications

3CSFP81 redefines entry-level fiber connectivity as a 155M SFP multi-mode optical transceiver, engineered with a precision 1310nm FP laser and PIN photo detector to drive seamless data transmission up to a 2km span across multi-mode fiber within standard 0°C to 70°C commercial environments.

3Com Part Number	3CSFP81	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	155Mbps
Wavelength	1310nm	Max Cable Distance	2km
Connector	Duplex LC	Media	MMF
Transmitter Type	FP	Receiver Type	PIN
TX Power	-18 to -10dBm	RX Power	-30 to -6dBm
Receiver Sensitivity	-26dBm	DOM Support	Yes
Operating Temperature Range	0 to 70°C	Protocols	IEEE 802.3z, SFF-8472, FC-PI, SFP MSA (INF-8074i) Compliant

Videos

Matching Products

Pictures

ID#

Description

Price

Stock

Add to Cart

Download

Product Drawing

PDF
LS-MM3101-02C.pdf

Questions & Answers
Ask a Question

No data

Q: Will the DOM laser bias current readings stay accurate if my network closet gets up to 45°C? By U***h on 2026-01-05

A: Yes, the built-in DOM microchip is calibrated to report accurate real-time telemetry across its entire 0°C to 70°C operating window. By admin on 2026-01-06
Q: Do these 155M SFP modules support hot-swapping, or do I need to reboot my edge router to get the system to recognize the module? By X***h on 2025-11-29

A: They are fully hot-pluggable. You can swap them live without interrupting the rest of your rack's traffic. By admin on 2025-11-30
Q: Can I use a standard single-mode Duplex LC patch cord with this transceiver if the run is very short? By V***n on 2025-08-27

A: No, this is an MMF (multimode) transceiver utilizing a 1310nm FP laser designed specifically for multi-mode fiber cores. By admin on 2025-08-28
Q: We accidentally ordered a single-mode patch cord. Can we use a mode-conditioning cable to make this 155M multi-mode SFP module work over it? By Y***r on 2025-07-14

A: Mode-conditioning cables are meant for the opposite scenario (SMF optics over MMF). For this module, you must use a dedicated duplex LC multi-mode fiber patch cord. By admin on 2025-07-15
Q: Does this transceiver support old-school OC-3 ATM telecom links, or is it strictly for Fast Ethernet? By W***r on 2025-03-15

A: It supports both! The 155Mbps physical layer rate is perfectly timed for both Fast Ethernet (100BASE-FX) and SONET legacy equipment. By admin on 2025-03-16

Customer Reviews
Write a Review

{{stardata.star}}

{{comment.count}} reviews
5 Stars

{{comment.star5}}%

4 Stars

{{comment.star4}}%

3 Stars

{{comment.star3}}%

2 Stars

{{comment.star2}}%

1 Star

{{comment.star1}}%

All Reviews ({{comment.star_num?comment.star_num:comment.count}})

All Reviews

5 stars only

4 stars only

3 stars only

2 stars only

1 star only
Reviews with Pictures ( {{comment.pic_comment}} )
See All Reviews

No data

N***y

India

Verified Purchase

5 .0

2026-01-27

Excellent price to performance ratio for these 2km MMF SFP modules. Will buy more.

15 Helpful vote Comments

N***t

Germany

Verified Purchase

4 .0

2026-01-18

Modules perform exactly up to the 2km MMF SFP module specifications on our multi-mode network. However, the plastic dust caps on the Duplex LC ports were a bit loose in the bag and one had fallen off. Cleaned the optical face just in case and it works flawlessly. Good cheap alternative to expensive OEM optics.

18 Helpful vote Comments

A***e

Italy

Verified Purchase

5 .0

2025-12-15

These are perfect for our legacy ISP nodes where we still run Fast Ethernet links. The module fits well into crowded patch panels, and the digital diagnostics help us proactively monitor line degradation.

89 Helpful vote Comments

C***s

Denmark

Verified Purchase

4 .0

2025-12-08

Excellent Fast Ethernet 1310nm SFP modules for our campus intercom project, but delivery took an extra two days due to a local customs clearance delay. Once they arrived, they plugged right in and linked up with zero configuration needed. Great value if you're not in an absolute rush!

14 Helpful vote Comments

S***w

France

Verified Purchase

5 .0

2025-11-03

Perfect Fast Ethernet 1310nm 155M SFP module for our campus fiber bridge. No complaints.

15 Helpful vote Comments

M***x

Canada

Verified Purchase

5 .0

2025-10-30

Been running 24/7 in our indoor network closet for weeks, zero frame loss.

21 Helpful vote Comments

J***n

Austria

Verified Purchase

5 .0

2025-10-11

Perfect compatibility match for our legacy fiber rings. The 155Mbps speed is highly stable and the Duplex LC ports lock in securely. No random link drops or port flapping whatsoever. (•‿•)

56 Helpful vote Comments

L***s

United Kingdom

Verified Purchase

5 .0

2025-09-08

For anyone still running legacy SONET/SDH or STM-1/OC-3 lines for utility automation, this 2km multi-mode SFP module is a highly reliable drop-in replacement. We deployed a dozen of these across our substation automation network to link remote terminal units (RTUs). The 1310nm FP laser provides a very clean optical eye diagram. Having real-time DOM means we can track optical receive power remotely, preventing unexpected failures due to deteriorating fiber splices. The metal housing provides excellent EMI shielding which is crucial in high-voltage substation environments. ⚡

48 Helpful vote Comments

L***r

Spain

Verified Purchase

5 .0

2025-08-14

I handle the network infrastructure for a large hospital campus where we still have legacy medical imaging systems hooked up via 155Mbps multi-mode fiber lines. When our OEM transceivers started failing, the original vendor quoted an absurd lead time and price. We decided to test these Fast Ethernet 155M SFP modules as an alternative. Not only did they link up instantly with our legacy edge switches, but the DDM diagnostic data is actually cleaner than the original OEM optics. They have handled heavy DICOM image transfers for over 3 weeks straight without a single interface error. Exceptional product!

83 Helpful vote Comments

C***r

Norway

Verified Purchase

5 .0

2025-07-05

Our telecom firm specializes in retrofitting older multi-tenant building complexes where pulling new single-mode fiber is cost-prohibitive, so we have to maximize the existing legacy multi-mode fiber infrastructure. These 2km MMF SFP modules allow us to deliver stable 155Mbps dedicated circuits for legacy building control systems and fire alarms. The Duplex LC connectors have solid mechanical latching, preventing loose connections in vibrating telecom risers. We've purchased over 100 units so far, and the failure rate is exactly 0%. Will continue to source our multimode optics transceivers from here.

149 Helpful vote Comments

L***d

Australia

Verified Purchase

5 .0

2025-06-19

Great value. Our procurement team was happy with the wholesale pricing. Installed them on a multi-floor university network setup using multi-mode fiber. Highly recommended for network admins on a budget!

67 Helpful vote Comments

W***s

Switzerland

Verified Purchase

5 .0

2025-04-16

Using them for local building links on an old fiber backbone. The 2km distance rating gives us plenty of headroom for our 800m runs. Attenuation is well within acceptable limits. Good stuff!

131 Helpful vote Comments

M***t

Brazil

Verified Purchase

5 .0

2025-04-04

We deployed these 2km MMF SFP modules in an enterprise office environment for old print-server VLAN lines. They support the standard STM-1/OC-3 protocols flawlessly. DDM telemetry shows very stable TX/RX power levels.

36 Helpful vote Comments

O***s

Netherlands

Verified Purchase

5 .0

2025-03-29

Bought a batch of these for a legacy upgrade project across several school buildings. The Duplex LC interfaces snap in tightly and the DOM metrics match our fluke testers perfectly. Very satisfied with the build quality.

110 Helpful vote Comments