Juniper QDD-ER8-400G 40KM Transceiver Module

About Juniper QDD-ER8-400G 400GBASE-ER8 40KM QSFP-DD Transceiver Module in Bangladesh

The Juniper QDD-ER8-400G is a high-speed 400Gbps QSFP-DD optical transceiver designed for long-distance data center, routing and high-performance networking applications. Based on the 400GBASE-ER8 optical standard, the module provides connectivity over up to 40km of single-mode fiber and uses a duplex LC optical interface.

The ER8 architecture uses eight optical lanes and PAM4 modulation to deliver 400Gbps aggregate bandwidth. Juniper's 400G transceiver architecture uses QSFP-DD as the form factor and an 8-lane 400GAUI-8 electrical host interface. :contentReference[oaicite:1]{index=1}

Juniper QDD-ER8-400G Specifications & Features

Overview

The Juniper QDD-ER8-400G is designed for 400 Gigabit Ethernet connectivity over extended distances. Its 400GBASE-ER8 architecture is intended for links of up to 40km using standard single-mode fiber.

With a QSFP-DD form factor and 400Gbps aggregate bandwidth, the module is suitable for high-density data center interconnects, metro networking, enterprise backbone infrastructure and high-performance routing and switching environments.

Buy Juniper QDD-ER8-400G 400G Transceiver in Bangladesh

Purchase the Juniper QDD-ER8-400G 400GBASE-ER8 40km QSFP-DD Transceiver Module from Datacom Technologies (BD). We supply Juniper optical transceivers, switches, routers, data center networking equipment and enterprise optical solutions in Bangladesh with competitive pricing, technical consultation and nationwide delivery.

Key Features

• 400Gbps high-speed Ethernet connectivity
• 400GBASE-ER8 optical standard
• Up to 40km transmission distance
• QSFP-DD form factor
• 8-lane optical architecture
• PAM4 modulation
• 1310nm LAN-WDM wavelengths
• Duplex LC connector
• Single-Mode Fiber support
• 400GAUI-8 host electrical interface
• Digital diagnostic monitoring
• Designed for compatible Juniper 400G platforms

400GBASE-ER8 Technology

400GBASE-ER8 is a 400 Gigabit Ethernet optical technology designed for extended-reach single-mode fiber links. The ER8 implementation uses multiple wavelength lanes to achieve the aggregate 400Gbps data rate.

Eight optical wavelengths are multiplexed within the transceiver and transported over a duplex single-mode fiber connection. This allows the module to achieve substantially greater reach than short-range parallel-optics 400G solutions.

40KM Transmission Distance

The QDD-ER8-400G is designed for transmission distances of up to 40km over suitable single-mode fiber. Juniper's optical specifications list 40km as the unamplified distance for the corresponding 400G ER8/ZR-class optical architecture. :contentReference[oaicite:2]{index=2}

The actual achievable distance depends on fiber characteristics, optical loss, connector loss, patch panels, link budget, dispersion and the network equipment at both ends of the link.

1310nm LAN-WDM

The ER8 architecture operates around the 1310nm optical window using multiple LAN-WDM wavelengths. The eight optical channels are multiplexed and demultiplexed within the transceiver.

This wavelength architecture allows high-bandwidth 400G transmission using a duplex LC fiber connection rather than requiring a large number of individual fiber pairs.

Single-Mode Fiber

The QDD-ER8-400G is designed for single-mode fiber (SMF). A suitable duplex single-mode fiber link should be used for 40km deployments.

Before installation, verify the fiber plant, connector type, optical budget and patch-panel configuration to ensure that the complete link meets the transceiver's requirements.

Duplex LC Connector

The ER8 optical interface uses a duplex LC connector. This provides two optical paths—one for transmission and one for reception—over a standard duplex single-mode fiber connection.

Duplex LC connectivity is convenient for structured fiber installations and long-distance network links where standard LC patching infrastructure is already available.

QSFP-DD Form Factor

Juniper's 400G optical transceivers use the QSFP-DD form factor. Juniper describes QSFP-DD as the form factor used by its 400G transceiver portfolio. :contentReference[oaicite:3]{index=3}

QSFP-DD allows high-density 400G connectivity in switches and routers while maintaining a compact pluggable optical-module format.

400GAUI-8 Electrical Interface

The 400G ER8 architecture uses an 8-lane 400GAUI-8 electrical host interface. Each electrical lane operates at approximately 50Gbps, providing the aggregate host-side bandwidth required for 400Gbps Ethernet.

Juniper describes its 400G architecture as using eight 50Gbps electrical lanes on the host side. :contentReference[oaicite:4]{index=4}

PAM4 Modulation

The QDD-ER8-400G uses PAM4 modulation technology. PAM4 allows more information to be carried per symbol than traditional two-level NRZ signaling, enabling higher bandwidth within the electrical and optical lane constraints.

The use of PAM4 is a key component of modern 400G optical networking technology.

Digital Diagnostic Monitoring

Compatible ER8 transceiver implementations support digital diagnostic monitoring, allowing network equipment to monitor optical operating parameters such as temperature, supply voltage and optical transmit/receive levels.

Digital diagnostics can help network administrators identify degraded optical links and simplify troubleshooting in large-scale data center environments.

Data Center Interconnect

The QDD-ER8-400G is well suited to high-bandwidth data center interconnect applications where 400Gbps connectivity must be extended beyond typical short-reach data center links.

• Data center interconnect
• Metro data center networking
• High-capacity backbone links
• Cloud infrastructure
• AI/ML networking infrastructure
• Large enterprise networks
• Service-provider aggregation

400G Networking Applications

400G Ethernet provides significant bandwidth for modern data center and backbone networks. The QDD-ER8-400G can be used where high-density 400G ports need longer optical reach than conventional short-range modules can provide.

It is particularly appropriate for infrastructure connecting data centers, aggregation sites, core routing platforms and other network locations over single-mode fiber.

Juniper 400G Optical Ecosystem

Juniper's 400G optical portfolio includes multiple optical standards and reaches, including short-range DR4, 10km LR4/LR8, 40km ER-class optics and longer-reach coherent ZR/ZR+ solutions. Juniper states that its 400G transceivers support multiple routing and switching platforms. :contentReference[oaicite:5]{index=5}

When selecting an optical module, the transceiver type should be matched to the required distance, fiber plant, connector, host platform and optical budget.

QDD-ER8-400G vs 400G LR4

Compatibility Considerations

The QDD-ER8-400G should only be installed in a network platform that supports the specific Juniper 400G optical module. Juniper provides a Hardware Compatibility Tool for checking supported 400G transceivers and platforms. :contentReference[oaicite:6]{index=6}

• Verify Juniper switch/router compatibility
• Verify QSFP-DD port support
• Confirm 400G Ethernet support
• Use compatible single-mode fiber
• Confirm duplex LC connectivity
• Verify optical link budget
• Confirm firmware and transceiver support

Benefits

• 400Gbps high-bandwidth connectivity
• Up to 40km optical reach
• QSFP-DD high-density form factor
• 400GBASE-ER8 architecture
• 1310nm LAN-WDM operation
• PAM4 modulation
• Duplex LC connectivity
• Single-mode fiber support
• Suitable for data center interconnects
• Ideal for high-capacity backbone and aggregation links

Why Buy from Datacom Technologies (BD)?

Datacom Technologies (BD) supplies Juniper optical transceivers, switches, routers, enterprise networking equipment and data center infrastructure in Bangladesh. Customers can receive competitive pricing, technical consultation, deployment assistance and nationwide delivery.

• Call/WhatsApp: +8801748173213
• Email: sales@datacom.com.bd
• Alternative Email: datacomtechnologiesbd@gmail.com
• Office: Tropical Center, 218, Dr. Kudroti Khuda Road, New Elephant Road, Dhaka-1205, Bangladesh

Frequently Asked Questions (FAQ)

Q1: What is the Juniper QDD-ER8-400G?
The QDD-ER8-400G is a 400Gbps QSFP-DD optical transceiver designed for 400GBASE-ER8 extended-reach networking.

Q2: What is the maximum transmission distance?
The ER8 specification supports up to 40km over suitable single-mode fiber.

Q3: What fiber does QDD-ER8-400G use?
It uses single-mode fiber (SMF).

Q4: What connector does the module use?
The ER8 optical interface uses a duplex LC connector.

Q5: What wavelength does QDD-ER8-400G use?
The 400GBASE-ER8 architecture operates around the 1310nm optical window using multiple LAN-WDM wavelengths.

Q6: What modulation does the module use?
The ER8 implementation uses PAM4 modulation.

Q7: What is the form factor?
The module uses the QSFP-DD form factor. Juniper uses QSFP-DD for its 400G optical transceiver portfolio. :contentReference[oaicite:7]{index=7}

Q8: What is the host electrical interface?
The 400G architecture uses an 8-lane 400GAUI-8 electrical interface.

Q9: Is QDD-ER8-400G suitable for data center interconnects?
Yes. Its 400Gbps capacity and extended optical reach make it suitable for high-bandwidth data center interconnect and backbone applications.

Q10: Is QDD-ER8-400G the same as a 400G LR4 module?
No. ER8 is designed for extended reach up to approximately 40km, while typical 400G LR4 modules are designed for shorter reaches around 10km.

Q11: Does QDD-ER8-400G work with any QSFP-DD switch?
No. The switch or router must support the specific 400G optical module and standard. Check Juniper's Hardware Compatibility Tool before deployment. :contentReference[oaicite:8]{index=8}

Q12: Where can I buy Juniper QDD-ER8-400G in Bangladesh?
You can contact Datacom Technologies (BD) for Juniper 400G optical transceivers, networking equipment and data center infrastructure with competitive pricing and nationwide delivery.