How does the optical performance and bit error rate (BER) of this BiDi module compare to OEM original Cisco or Arista 100G optics?

The LQ-BLA100-L21C is built with high-grade EML lasers, sensitive PIN photodetectors, and onboard KP4 FEC, fully compliant with IEEE 802.3bm and 100G Lambda MSA standards. It delivers the exact same optical budget (>6.5dB), insertion loss tolerance, latency, and pre-FEC/post-FEC BER performance as OEM optics at a fraction of the cost, backed by a comprehensive 5-year warranty.

What type of fiber patch cord do I need, and can two LQ-BLA100-L21C modules connect directly to each other?

You will need a standard Single-Mode Fiber (OS2 SMF, 9/125µm) with a Simplex LC/UPC connector. Note that you cannot connect two identical A-end (LQ-BLA100-L21C) units together. A bidirectional link requires one LQ-BLA100-L21C (TX 1291nm / RX 1311nm) at Site A and one LQ-BLB100-L21C (TX 1311nm / RX 1291nm) at Site B to complete the optical circuit on a single fiber strand.

We need to deploy these in non-climate-controlled roadside cabinets. Do you offer an industrial wide-temperature (-40°C to +85°C) version?

The standard LQ-BLA100-L21C is rated for commercial operating temperatures (0°C to 70°C). However, for outdoor telecom enclosures, 5G fronthaul/backhaul poles, and rugged industrial plants, we offer an Industrial Temperature (I-Temp, -40°C to +85°C) build upon request. Please contact our support team before placing your order to specify the industrial-grade requirement.

Can this 100G QSFP28 BiDi transceiver interoperate between a Cisco Nexus switch on one side and an Arista 7050 on the other?

Yes, absolutely. We can custom-code the EEPROM for each end—encoding one unit for Cisco (e.g., Nexus 9000 series) and the complementary unit for Arista. As long as you pair the LQ-BLA100-L21C (1291nm-TX/1311nm-RX) with the complementary LQ-BLB100-L21C (1311nm-TX/1291nm-RX), the physical optical link and 100GBASE-BX20 signaling will interoperate seamlessly with full DDM support across multi-vendor hardware.

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Arista QSFP-BX20-100G Compatible LINK-PP 100G QSFP28 BiDi 1291nm-TX/1311nm-RX 20km DOM Simplex LC SMF Optical Transceiver Module

Name: Arista QSFP-BX20-100G Compatible LINK-PP 100G QSFP28 BiDi 1291nm-TX/1311nm-RX 20km DOM Simplex LC SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 223460
Price: 2170.96 USD
Availability: InStock
Rating: 4.9 (16 reviews)

# 223460

Product: Arista QSFP-BX20-100G Compatible LINK-PP 100G QSFP28 BiDi 1291nm-TX/1311nm-RX 20km DOM Simplex LC SMF Optical Transceiver Module
SKU: 223460
P/N: LQ-BLA100-L21C
Price: $ 2,467
Stock: 237 in Stock
Sold: 647
Product URL: https://www.l-p.com/products/494714.htm

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

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Manufacture: LINK-PP

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Compatible:: Cisco; LINK-PP; Arista; Dell; FS; Generic; HPE Aruba; Juniper; NVIDIA/Mellanox

Compatible P/N:: QSFP-100G-SRBD | 100m; QSFP-SR1.2-100G | 100m; QSFP-BX10-100G | 10km; QSFP-BX20-100G | 20km; QSFP-BX40-100G | 40km

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Arista QSFP-BX20-100G Compatible LINK-PP 100G BiDi QSFP28 Specifications

The Arista QSFP-BX20-100G Compatible LINK-PP module is a premium 100G BiDi QSFP28 optical transceiver engineered for robust data center interconnects. Utilizing an advanced EML laser and PIN receiver, this module delivers 106.25Gb/s PAM4 signaling across single-mode fiber. It natively integrates KP4 FEC and features a CAUI-4 electrical interface, ensuring ultra-reliable connectivity with low power consumption.

Arista Part Number	QSFP-BX20-100G	Vendor Name	LINK-PP
Form Factor	QSFP28	Max Data Rate	106.25Gbps
Wavelength	1291nm-TX/1311nm-RX	Max Cable Distance	20km
Connector	Simplex LC	Media	SMF
Transmitter Type	EML	Receiver Type	PIN
Modulation (Electrical)	4x 25G-NRZ	Modulation (Optical)	1x 100G-PAM4
DDM/DOM	Supported	Operating Temperature Range	0°C to +70°C
Protocols	QSFP28 MSA	Warranty	5 Years

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Q: How does the optical performance and bit error rate (BER) of this BiDi module compare to OEM original Cisco or Arista 100G optics? By N***s on 2026-07-11

A: The LQ-BLA100-L21C is built with high-grade EML lasers, sensitive PIN photodetectors, and onboard KP4 FEC, fully compliant with IEEE 802.3bm and 100G Lambda MSA standards. It delivers the exact same optical budget (>6.5dB), insertion loss tolerance, latency, and pre-FEC/post-FEC BER performance as OEM optics at a fraction of the cost, backed by a comprehensive 5-year warranty. By admin on 2026-07-11
Q: What type of fiber patch cord do I need, and can two LQ-BLA100-L21C modules connect directly to each other? By C***l on 2025-11-30

A: You will need a standard Single-Mode Fiber (OS2 SMF, 9/125µm) with a Simplex LC/UPC connector. Note that you cannot connect two identical A-end (LQ-BLA100-L21C) units together. A bidirectional link requires one LQ-BLA100-L21C (TX 1291nm / RX 1311nm) at Site A and one LQ-BLB100-L21C (TX 1311nm / RX 1291nm) at Site B to complete the optical circuit on a single fiber strand. By admin on 2025-11-30
Q: We need to deploy these in non-climate-controlled roadside cabinets. Do you offer an industrial wide-temperature (-40°C to +85°C) version? By A***s on 2025-11-22

A: The standard LQ-BLA100-L21C is rated for commercial operating temperatures (0°C to 70°C). However, for outdoor telecom enclosures, 5G fronthaul/backhaul poles, and rugged industrial plants, we offer an Industrial Temperature (I-Temp, -40°C to +85°C) build upon request. Please contact our support team before placing your order to specify the industrial-grade requirement. By admin on 2025-11-22
Q: Can this 100G QSFP28 BiDi transceiver interoperate between a Cisco Nexus switch on one side and an Arista 7050 on the other? By D***s on 2025-10-12

A: Yes, absolutely. We can custom-code the EEPROM for each end—encoding one unit for Cisco (e.g., Nexus 9000 series) and the complementary unit for Arista. As long as you pair the LQ-BLA100-L21C (1291nm-TX/1311nm-RX) with the complementary LQ-BLB100-L21C (1311nm-TX/1291nm-RX), the physical optical link and 100GBASE-BX20 signaling will interoperate seamlessly with full DDM support across multi-vendor hardware. By admin on 2025-10-12

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A***n

Chile

Verified Purchase

5 .0

2026-06-18

Digital optical monitoring telemetry reporting exact dBm values on our Arista spine switches.

35 Helpful vote Comments

P***h

Austria

Verified Purchase

5 .0

2026-05-21

Perfect 20km reach on single fiber.

190 Helpful vote Comments

J***n

Dominican Republic

Verified Purchase

5 .0

2026-05-16

Flawless 100G BiDi link across town.

177 Helpful vote Comments

K***t

Norway

Verified Purchase

5 .0

2026-05-11

Saved half our dark fiber runs instantly!

42 Helpful vote Comments

M***z

Thailand

Verified Purchase

5 .0

2026-04-20

Excellent 100GBASE-BX20 alternative, cutting our metro network upgrade budget by over sixty percent.

77 Helpful vote Comments

P***s

Belgium

Verified Purchase

5 .0

2026-03-07

Zero packet loss at 100Gbps.

153 Helpful vote Comments

S***z

Austria

Verified Purchase

5 .0

2026-02-01

Great budget alternative to OEM optics.

98 Helpful vote Comments

A***s

Philippines

Verified Purchase

5 .0

2025-11-24

Rigorously benchmarked on Cisco Nexus 9336C and Juniper QFX5200 in our lab. BER test showed zero CRC errors over 20km spool; optical budget margin remained well above 6.5dB.

105 Helpful vote Comments

S***n

United States

Verified Purchase

5 .0

2025-10-11

Plugged in, 100G up immediately.

159 Helpful vote Comments

L***l

Netherlands

Verified Purchase

4 .0

2025-09-29

FedEx standard delivery took two days longer than estimated, though the 20km single-fiber link is rock solid.

5 Helpful vote Comments

L***z

Ghana

Verified Purchase

5 .0

2025-08-29

Halved our fiber patch panel footprint in the Chicago colocation data center facility.

180 Helpful vote Comments

D***n

Dominican Republic

Verified Purchase

5 .0

2025-05-12

Tested across Dell Z9100 switches; simplex LC connector latches firmly and securely.

73 Helpful vote Comments

J***h

Switzerland

Verified Purchase

5 .0

2025-04-18

Replaced dual-strand LR4 modules with these 100G BiDi QSFP28 optics across 12 metro links. Saved six dark fiber pairs instantly while maintaining sub-microsecond latency and flawless DOM voltage telemetry.

126 Helpful vote Comments

S***a

Denmark

Verified Purchase

5 .0

2025-03-14

Paired with the BLB100 counterpart, our 18km campus backbone link came up with zero issues.

59 Helpful vote Comments

J***z

Venezuela

Verified Purchase

5 .0

2025-01-29

Clean DOM readings on Juniper MX. ⚡

170 Helpful vote Comments

S***s

Indonesia

Verified Purchase

5 .0

2024-12-17

Deployed across a 19.2km single-mode span between enterprise data centers. The 1291nm EML laser holds stable -1.2dBm TX power with KP4 FEC handling signal integrity effortlessly under 3.6W load.

163 Helpful vote Comments