Cisco QSFP-100G-LR4-S= 100G QSFP28 LR4 optical transceiver

🚀 Reliable 100G Connectivity Up to 10km | Cisco QSFP-100G-LR4-S=

The Proven Long-Reach 100G Solution for Data Centers & Metro Networks

The Cisco QSFP-100G-LR4-S= is a high-performance 100G QSFP28 optical transceiver designed for long-reach transmission over single-mode fiber (SMF).

Operating around 1310nm wavelength using 4 CWDM channels, it supports transmission distances of up to 10km, making it ideal for data center interconnect (DCI) and metro network deployments.

With mature technology and strong compatibility, LR4 remains one of the most reliable and widely deployed 100G long-distance solutions.

🔥 Why This Module Is Still Essential

✔ Need stable 100G over long distance (up to 10km) ✔ Building data center interconnect (DCI) ✔ Require carrier-grade reliability

👉 LR4 = the most proven 100G long-reach solution

⚡ SR4 vs CWDM4 vs FR vs LR4

Type	Fiber	Distance	Connector	Technology
SR4	MMF	≤100m	MPO	Parallel
CWDM4	SMF	≤2km	LC	4 wavelengths
FR	SMF	≤2km	LC	Single lambda
LR4	SMF	≤10km	LC	CWDM (4 wavelengths)

👉 LR4 = longest reach within standard 100G QSFP28

🧠 Key Features of Cisco QSFP-100G-LR4-S=

Data Rate: 100 Gbps

Wavelength: 1310 nm (4 CWDM lanes)

Distance: Up to 10 km

Connector: LC Duplex

Fiber Type: Single-mode fiber (SMF)

Technology: LAN-WDM (4 wavelengths)

Form Factor: QSFP28

Digital Optical Monitoring (DOM): Supported

Hot-swappable

Power Consumption: ~4–4.5W

🏗️ High-Value Application Scenarios

1. Data Center Interconnect (DCI)

Up to 10km reach

Inter-building connectivity

2. Metro & Carrier Networks

Long-distance backbone links

High reliability

3. Enterprise Campus Networks

Building-to-building connections

Stable long-distance transmission

4. Cloud & Hyperscale Deployment

Reliable long-haul 100G links

Mature ecosystem support

💡 Why Choose LR4?

👉 Alternative options:

CWDM4 / FR → limited to 2km

SR4 → only for short distance

👉 LR4 offers:

Up to 10km transmission

Proven and stable technology

Wide compatibility across vendors

Ideal for DCI and metro applications

✅ Best for long-distance, mission-critical networks

🧩 Complete 100G SMF Solution

✅ Optical Modules

Cisco QSFP-100G-LR4-S=

Cisco QSFP-100G-CWDM4-S= (for shorter 2km scenarios)

✅ Cabling

LC-LC single-mode fiber (OS2)

✅ Equipment

100G switches

DCI / metro architecture

👉 LR4 = backbone-grade 100G solution

📊 Technical Specifications

Parameter	Specification
Form Factor	QSFP28
Data Rate	100 Gbps
Wavelength	1310 nm (LAN-WDM)
Max Distance	10 km
Connector	LC Duplex
Fiber Type	Single-mode
Power Supply	3.3V
Operating Temp	0°C to +70°C
DOM Support	Yes
Compliance	IEEE 802.3ba, QSFP28 MSA

❓ FAQ

Q1: What is QSFP-100G-LR4-S used for?

It is used for 100G transmission over SMF up to 10km.

Q2: Is LR4 better than CWDM4 or FR?

For long distances, yes — LR4 supports much longer reach (10km vs 2km).

Q3: What is the difference between LR4 and ER4?

LR4 supports 10km, while ER4 typically supports 40km.

Q4: What fiber is required?

Standard OS2 single-mode fiber.

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🚀 Get a Quote for Your 100G Deployment

👉 Planning a long-distance 100G network?

✔ 10km reliable transmission ✔ Carrier-grade stability ✔ Proven deployment worldwide