Juniper Networks QSFP-100G-FR QSFP28 100 Gigabit Ethernet Transceiver Module.

Juniper Networks QSFP-100G-FR QSFP28 100 Gigabit Transceiver Module

The Juniper Networks QSFP-100G-FR QSFP28 100 Gigabit Ethernet FR Duplex LC PC/UPC Transceiver Module category includes high-performance optical modules designed for 100GbE FR (100 Gigabit Ethernet — FE long reach) links using QSFP28 form factor. These transceivers use duplex LC connectors with PC or UPC polished ferrules, and are engineered for reliable metro and long-haul connectivity where single-wavelength 100G over fiber is required. This category page groups compatible FR optics, replacement modules, and cross-vendor equivalents suited for Juniper platforms and other QSFP28-capable switches and routers.

Key features and defining characteristics

QSFP28 form factor and backward compatibility

Modules in this category conform to the QSFP28 mechanical and electrical specification for 100 Gigabit Ethernet, providing a compact quad-lane optics solution with enhanced thermal and signal integrity properties. QSFP-100G-FR transceivers are typically pin-compatible with other QSFP28 modules and support the QSFP MSA (Multi-Source Agreement) interface. While QSFP28 is optimized for 25 Gbps per lane signaling, FR modules implement a single-wavelength 100G serial or specific PAM4/NRZ modulation as required by the vendor.

Duplex LC connector and PC/UPC polishing

The duplex LC connector pair is the physical fiber interface for these FR modules. Two variants are commonly encountered: PC (Physical Contact) and UPC (Ultra Physical Contact). UPC offers a finer surface finish and lower back reflection compared to standard PC, which can be beneficial in applications sensitive to reflectance. The category includes both PC and UPC polished options; product pages clearly indicate polishing type to guide high-performance optical network planning.

Optical reach and wavelength

“FR” denotes a focus on medium-to-long reach performance over single-mode fiber (SMF). Typical link budgets and transceiver characteristics for FR-class modules include:

• Wavelength: commonly in the 1295–1330 nm range for some serial 100G optics or specific ITU grids for DWDM-integrated variants.
• Typical reach: FR modules generally target metro distances (up to tens of kilometers) depending on fiber quality and dispersion compensation. Many FR transceivers are rated for up to ~2–10 km under standard SMF conditions, though vendor datasheets should be consulted for precise reach figures.
• Power budget: specified as transmitter launch power, receiver sensitivity, and optical plus electrical link margin to determine achievable distance per fiber link.

Technical specifications (typical values and what to look for)

Electrical and protocol support

When selecting a QSFP-100G-FR module, verify the following electrical and protocol capabilities:

• Host interface: QSFP28 electrical pinout compliant with IEEE 802.3 or vendor MSA.
• Data rate: native 100 Gbps support; verify whether module uses Modulation schemes such as NRZ, PAM4, or serial 100G (e.g., 4×25G or single-lane 100G depending on product design).
• Compatibility with IEEE 802.3cd/ca standards where applicable, and support for FEC (Forward Error Correction) if required by the network or switch platform for longer reach.

Optical characteristics

• Connector: Duplex LC (single-mode fiber).
• Transmitter type: DML, EML, or integrated laser tuned for the required wavelength.
• Receiver: PIN or APD photodiode; sensitivity levels vary by product.
• Optical output power: Tx power typical ranges indicated on vendor datasheet.
• Dispersion tolerance: critical for longer metro links; check module’s chromatic and PMD tolerance.

Environmental and mechanical

• Operating temperature range: commercial (0°C to 70°C), industrial (-40°C to 85°C) or extended depending on SKU.
• MTBF and reliability: look for vendor-provided MTBF figures and warranty terms.
• Power consumption: QSFP28 FR optics typically draw more power than lower-speed SFP+ modules; confirm switch power budgets.

How to read a datasheet entry

Datasheet items you should pay special attention to include transmitter wavelength, extinction ratio, receiver sensitivity, guaranteed link length (km), optical budget (dB), and recommended fiber type. Cross-reference these with your existing fiber plant (attenuation per km, connectors, splices) and duplex LC connector polishing (PC vs UPC) when designing or validating a link.

Compatibility and interoperability

Juniper platform compatibility

This category emphasises modules certified or confirmed to work with Juniper devices. Many Juniper routers and switches accept Juniper-branded QSFP-100G-FR modules and may also allow third-party optics. When planning purchases for Juniper hardware, consider:

• Model-specific compatibility lists: EX, QFX, MX, and PTX series models may have firmware and hardware constraints—consult Juniper compatibility matrices.
• Firmware and software version: newer software releases can affect optics behavior; when replacing optics, ensure switch software supports the inserted transceiver.

Cross-vendor interoperability

Third-party or multi-vendor QSFP28 FR modules can function in heterogeneous environments when they conform to QSFP MSA and IEEE optical/electrical specifications. Interoperability points to verify:

• EEPROM / SFP-DD/QSFP ID fields: some vendors encode vendor-specific EEPROM data; “vendor-locked” devices may be rejected by strict host firmware.
• Supported link training and FEC modes to negotiate with the host device.
• Compliance to industry standards to ensure compatibility with other vendors’ optics for 100G FR links.

Compatibility checklist

1. Confirm the host device accepts QSFP28 form factor and 100G FR optics.
2. Verify the switch/router firmware version supports third-party modules if planning to use them.
3. Match connector polishing (PC vs UPC) and fiber type (OS1/OS2) to avoid reflectance or attenuation issues.
4. Confirm required link length and verify power budget vs attenuation and connector/splice losses.
5. Test interoperability in a lab environment before deploying to production.

Use cases and deployment scenarios

Data center interconnect (DCI)

For short- to medium-distance data center interconnects where a low-latency 100GbE link is needed across campus or metro fiber, QSFP-100G-FR transceivers offer a balance of cost and reach. They are frequently used to connect aggregation or spine switches across campus buildings, to link multi-rack systems, or as a step-up from 40G systems.

Metro aggregation and carrier Ethernet

Carrier and service provider networks that require 100GbE links between aggregation nodes or central offices may choose FR optics to traverse metro fiber with limited dispersion and manageable attenuation. FR modules are also suitable for business services that require dedicated 100G links across a city network.

Backbone connectivity and campus core

Enterprises deploying 100GbE as a campus backbone can use QSFP28 FR modules to upgrade existing fiber paths without replacing fiber infrastructure, provided the fiber attenuation and connectors meet the module’s optical budget.

Performance considerations and optimization

Power and thermal management

QSFP28 FR modules dissipate power which can affect switch thermal design. When populating multiple ports, ensure the host has adequate airflow and ambient temperature allowances. Over-populating high-power optics in a single chassis location may require redistributing modules to avoid hot spots.

FEC and link stability

Forward Error Correction (FEC) modes can improve reach and reduce BER but add latency. Determine whether your application tolerates the added latency (typically microseconds) to benefit from improved error rates and greater achievable distance. For carrier or long reach deployments, FEC is commonly enabled to meet error-rate targets.

Signal integrity and fiber considerations

High-speed 100G links are sensitive to connector quality, splices, and age-related fiber loss. Replace suspect patch cords that show high insertion loss, and use APC/UPC matching where necessary. For DWDM-integrated FR modules, check channel spacing and optical filtering requirements.

Sample SKU mapping approach

To map an equivalent SKU, compare the vendor datasheet tables side-by-side: link budget (dB), transmitter/receiver specs, operating temp, and supported host platforms. Keep a record of tested combinations that are known-good in your environment.

Regulatory, safety and handling information

Laser safety and compliance

QSFP28 transceivers contain laser sources that may be classified under IEC 60825-1. Always follow safe handling practices: do not stare into optical ports, and use protective dust caps. Ensure installations comply with local and international safety regulations.

RoHS, REACH and environmental compliance

Many vendors certify compliance with RoHS (hazardous substances) and REACH regulations. Verify product pages for declarations of conformity if your procurement requires regulatory documentation.

Comparison with other 100G optical options

FR vs LR vs ER vs DWDM QSFP28

When planning upgrades from 10/40/100G, evaluate these common classes:

• LR (Long Reach): typically optimized for 10 km+ single-mode links.
• ER (Extended Reach): geared for very long links (40+ km) with higher power lasers and dispersion tolerance.
• DWDM: Dense Wavelength Division Multiplexing optics embed a precise ITU channel for multi-channel long haul over a single fiber pair.
• FR: fills the metro/medium reach niche—cost-effective and easier to manage for many campus or service provider scenarios.

Final procurement tips and checklist

Pre-purchase validation

• Confirm host model and supported optics list.
• Review fiber plant documentation for attenuation, connector types, and approximate distance.
• Decide between OEM and third-party optics based on warranty, cost, and support requirements.
• Order spares to minimize downtime on critical links.
• Plan firmware and testing windows for deployment to avoid production impact.

Post-purchase validation

• Test modules in a lab or staging environment with the intended host and fiber.
• Document successful pairings and firmware versions for future procurement.
• Integrate module diagnostics into your NMS for continuous monitoring.

Additional resources and recommended reads

Manufacturer datasheets and compatibility matrices

Always consult the official Juniper datasheets, platform release notes, and optics compatibility matrices before making final purchasing or deployment decisions. These documents provide the definitive values for optical budgets, supported host platforms, and software prerequisites.

Whitepapers and network design guides

For larger rollouts, consult network design guides that cover 100GbE architectures, QSFP28 thermal planning, fiber selection (OS1 vs OS2), and DWDM considerations if future wavelength multiplexing is anticipated.

Community forums and field reports

Field experiences from network engineering communities often highlight real-world interoperability tips and specific firmware versions known to work with third-party optics. Use these as supplemental references but prioritize vendor documentation for production decisions.