Sourced for enterprise IT teams, the Juniper QFX-QSFP-40G-ESR (QFX-QSFP-40G-ESR - Juniper 40Gbps 40GBase-ESR Multi-mode Fiber 300m 850nm MPO Connector QSFP+ Transceiver Module) is a Transceiver component appropriate for new-build, expansion, or warranty-replacement procurement. Technical specifications include network speed of 40 GbE, wavelength of 850 nm, range of 300 m, features of QSFP. Appropriate for enterprise core-aggregation tier, hyperscale leaf-spine fabric expansion, EVE-NG / GNS3 lab environments at scale, and matched-pair high-availability switching deployments. Pro Disk Network maintains the QFX-QSFP-40G-ESR in our enterprise inventory and verifies each unit against manufacturer datasheet specifications prior to listing. New stock ships factory-sealed where available; refurbished units are tested under load before dispatch and ship with a 90-day Pro Disk Network functional warranty. Same-day dispatch on in-stock orders placed before 3pm ET; free standard ground shipping on US orders over $150.
The QFX-QSFP-40G-ESR is a Juniper transceiver component with network speed 40 GbE, wavelength 850 nm, range 300 m. Pro Disk Network sells the QFX-QSFP-40G-ESR for $731.28 with same-day US shipping and a 30-day return guarantee.
Reviewed By
Reviewed by:Pro Disk Network Engineering Team — . Specifications, compatibility, and pricing for the QFX-QSFP-40G-ESR are shown on this page.
Trust Signals
US-based LLC — 7345 W Sand Lake Rd, STE 210, Office 3208, Orlando, FL 32819
Same-Day US Shipping — orders before 3pm ET ship today via UPS
30-Day Returns — pre-paid label on DOA and defective items
Quick Answer: Is the QFX-QSFP-40G-ESR compatible with my switch?
Pro Disk Network validates every QFX-QSFP-40G-ESR against the target switch's published compatibility matrix before shipment. If you let us know your switch model and firmware version, we will confirm fitment and code the module appropriately (Cisco-coded, Juniper-coded, HPE-coded, etc.) at no extra charge.
How fast does the QFX-QSFP-40G-ESR ship?
QFX-QSFP-40G-ESR orders placed before 3 pm ET ship the same business day from US warehouses. Delivery is next business day to most metro ZIPs via FedEx/UPS overnight; ground delivery covers remaining US in 1-4 business days.
The QFX-QSFP-40G-ESR is deployed by US enterprises, MSPs, government, and education customers across multiple infrastructure scenarios. Below are the most common deployment patterns Pro Disk Network sees in real-world orders.
Server Uplink — 10G/25G server-to-leaf uplink — pair with matching DAC or AOC at the host NIC to avoid optic mismatch.
DCI (Data Center Interconnect) — Inter-DC routing or aggregation. LR4/LR8 transceivers for 10–80 km, ER4 for 40 km, ZR4 for coherent long-haul.
Campus Distribution — Catalyst-class campus distribution between IDF and MDF closets. PoE+ where wireless APs and IP phones share infrastructure.
Branch / Edge — Smaller form-factor switches and routers for branch sites. SD-WAN-compatible or static-VPN-attached as the architecture dictates.
What is the QFX-QSFP-40G-ESR?
The QFX-QSFP-40G-ESR is a Juniper network interface module with network speed 40 GbE and wavelength 850 nm, manufactured by Juniper. Pro Disk Network ships this part new and certified-refurbished from our US warehouse with same-day dispatch on orders placed before 3 PM ET, backed by a 30-day return guarantee.
Pros & Cons of QFX-QSFP-40G-ESR
Pros
Matched-pair option for redundant link orders
Cabling and DAC/AOC labels clearly mark optic class
Cons
Third-party optic — some firmware revs require "service unsupported transceiver-type"
Bulk DAC orders may ship LTL on >100-pc reels
Confirm transceiver coding before mixing vendors in the same chassis
Frequently Asked Questions about QFX-QSFP-40G-ESR
Is the QFX-QSFP-40G-ESR a genuine Juniper part?
Yes. Pro Disk Network sources every QFX-QSFP-40G-ESR as factory-original Juniper inventory. New units arrive sealed in OEM packaging; refurbished units are pulled from decommissioned Juniper servers, surface-tested, and re-warranted by Pro Disk Network for 90 days.
Is the QFX-QSFP-40G-ESR compatible with my switch?
Pro Disk Network validates every QFX-QSFP-40G-ESR against the target switch's published compatibility matrix before shipment. If you let us know your switch model and firmware version, we will confirm fitment and code the module appropriately (Cisco-coded, Juniper-coded, HPE-coded, etc.) at no extra charge.
How fast does the QFX-QSFP-40G-ESR ship?
QFX-QSFP-40G-ESR orders placed before 3 pm ET ship the same business day from US warehouses. Delivery is next business day to most metro ZIPs via FedEx/UPS overnight; ground delivery covers remaining US in 1-4 business days.
What is the warranty on the QFX-QSFP-40G-ESR?
New QFX-QSFP-40G-ESR units carry the full Juniper manufacturer warranty (typically 1 to 5 years depending on product line). Refurbished and bulk-OEM units include a Pro Disk Network advance-replacement warranty (90 days refurbished). DOA replacement is free within 30 days of receipt.
Do you offer bulk pricing for the QFX-QSFP-40G-ESR?
Email sales@prodisknetwork.com with the quantity and target ship date for a quote within one business day.
QFX-QSFP-DAC-1M — QFX-QSFP-DAC-1M - Juniper 1M 40Gb/s QSFP+ to QSFP+ 10 Gigabit Ethernet Direct Attach Copper Twinax Cable — $184.21
QFX-QSFP-DAC-3M — QFX-QSFP-DAC-3M - Juniper Networks 3m 40G QSFP to QSFP Passive Direct Attached Copper Cable — $194.74
Pro Disk Network Buyer’s Guide: Transceiver
Optic Coding, Vendor Lock-In, and Multi-Vendor Compatibility
For Cisco IOS, IOS-XE, and NX-OS switches, the QFX-QSFP-40G-ESR works out-of-box if coded for Cisco; for Aruba ArubaOS-CX, code for HPE/Aruba; for Juniper Junos, code for Juniper. Pro Disk Network confirms the target vendor coding at order time and applies it before shipping. Misordered coding can be flashed in the field but the lead time is longer than ordering correctly the first time.
Bandwidth Sizing for Spine-Leaf, EVPN-VXLAN, and Hyperconverged Storage
Document optic types and bandwidth in your network drawings: SR-SR for intra-rack, LR-LR for inter-rack and DCI, ZR4 for long-haul coherent. Mismatched optic-distance ratings is the most common cause of intermittent link errors that look like cable problems but aren't.