Finisar FTL4C1QL2L 40GBASE-LR4 2km QSFP+ Transceiver

Finisar FTL4C1QL2L 40GBASE-LR4 2km QSFP+ Transceiver Specifications

Finisar FTL4C1QL2L 40GBASE-LR4 Lite QSFP+ Transceiver – 40GbE SMF 2km LC Module

The Finisar FTL4C1QL2L 40GBASE-LR4 Lite QSFP+ Transceiver is a high-performance optical fiber module designed for enterprise data centers and high-speed network backbone connections. It provides reliable 40 Gigabit Ethernet (40GbE) connectivity over single-mode fiber (SMF) with a reach of up to 2 kilometers, making it ideal for medium-distance interconnects between switches, routers, and server aggregation layers.

This QSFP+ optical transceiver uses the LR4 Lite (1310nm CWDM) technology, transmitting four independent 10Gbps channels over a single LC duplex fiber pair. It ensures stable, low-latency, and high-bandwidth communication for modern networking environments such as cloud infrastructure, ISP backbones, and enterprise data centers.

Built in a hot-pluggable QSFP+ form factor, the module supports easy installation and replacement without shutting down network equipment. It is fully compliant with the QSFP+ MSA and IEEE 802.3ba 40GBASE-LR4 standard, ensuring interoperability with a wide range of networking devices.

Key Features:

• 40GBASE-LR4 Lite 40GbE optical transceiver
• QSFP+ hot-pluggable form factor
• Supports up to 2km over single-mode fiber (SMF)
• LC duplex connector interface
• 4x10Gbps CWDM lanes (1310nm range)
• Low power consumption (<2.5W typical)
• Digital Diagnostic Monitoring (DOM) support
• IEEE 802.3ba and QSFP+ MSA compliant

Typical Applications:

• Data center spine-leaf architecture
• Enterprise core switching and routing
• ISP and telecom backbone networks
• Cloud computing and virtualization clusters
• High-speed storage networking (SAN)

FAQ – Finisar FTL4C1QL2L Bangladesh

What is Finisar FTL4C1QL2L QSFP+ transceiver?

It is a 40GBASE-LR4 QSFP+ optical module that converts electrical signals into optical signals for high-speed 40Gbps transmission over fiber networks.

According to datasheet, it supports up to 2 km distance over single-mode fiber (SMF) with LC duplex connector.

What is the speed of FTL4C1QL2L?

This module supports:

• 40GbE (40 Gigabit Ethernet)
• Aggregate data rate: 41.2 Gb/s
• 4×10Gbps lanes (WDM technology)

What type of fiber does it use?

It uses:

• Single-mode fiber (SMF)
• LC duplex connector
• Wavelength around 1310 nm band

What is the maximum distance supported?

• Up to 2 kilometers (2km) over single-mode fiber
• This makes it suitable for:
• Data center interconnect
• Enterprise backbone networks
• ISP distribution links

Is Finisar FTL4C1QL2L compatible with Cisco switches?

Yes, it is commonly compatible with:

• Cisco Catalyst 3850 / 4500 / 9300 series
• Cisco Nexus series (depending on model and firmware)
• Other QSFP+ 40G ports

However, Cisco sometimes restricts third-party optics with firmware lock.

What is LR4 in this transceiver?

LR4 means:

• Long Reach (LR)
• 4 wavelength multiplexing (WDM)
• Each lane carries 10Gbps over different wavelengths.

Is Finisar FTL4C1QL2L hot swappable?

Yes, it is:

• Hot-pluggable QSFP+ module
• Can be inserted or removed without shutting down the switch

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