Enterasys part number 40GB-LR4-QSFP identifies the 40GB-LR4-QSFP - Enterasys 40Gbps Single-mode 10km LC Duplex Connector QSFP+ Transceiver Module, an enterprise-grade Transceiver unit appropriate for data-center, server-room, and workstation deployment. Technical specifications include capacity of 40 GB, range of 10 km, features of QSFP. Typical use cases include enterprise LAN core-distribution-access architecture, hyperconverged cluster east-west traffic, SAN fabric uplinks, and replacement of EOL/EOSL networking infrastructure under existing OEM warranty contracts. Pro Disk Network maintains the 40GB-LR4-QSFP 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 40GB-LR4-QSFP is a Enterasys transceiver component with capacity 40 GB, range 10 km, features QSFP. Pricing on the 40GB-LR4-QSFP is quote-based — email sales@prodisknetwork.com or use our live chat for a quote within one business day.
Reviewed By
Reviewed by:Pro Disk Network Engineering Team — . Specifications, compatibility, and pricing for the 40GB-LR4-QSFP are shown on this page.
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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 40GB-LR4-QSFP compatible with my switch?
Pro Disk Network validates every 40GB-LR4-QSFP 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 40GB-LR4-QSFP ship?
Pro Disk Network dispatches the 40GB-LR4-QSFP same-day on orders confirmed before 3 pm ET. Multi-pallet projects requiring crating ship within 2 business days. International shipping (Canada, Mexico, EU, APAC) takes 3-7 business days via DHL Express or FedEx International Priority.
The 40GB-LR4-QSFP 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.
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 40GB-LR4-QSFP?
The 40GB-LR4-QSFP is a Enterasys network interface module with capacity 40 GB and range 10 km, manufactured by Enterasys. 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 40GB-LR4-QSFP
Pros
Same-day US shipping cuts deployment downtime
Cons
DAC cables capped at 7 m — use AOC or fibre for longer runs
SR optic vs LR optic confusion — verify before ordering
Refurbished tier optic does not include retail vendor packaging
Frequently Asked Questions about 40GB-LR4-QSFP
Is the 40GB-LR4-QSFP a genuine Enterasys part?
Yes. Pro Disk Network sources every 40GB-LR4-QSFP as factory-original Enterasys inventory. New units arrive sealed in OEM packaging; refurbished units are pulled from decommissioned Enterasys servers, surface-tested, and re-warranted by Pro Disk Network for 90 days.
Is the 40GB-LR4-QSFP compatible with my switch?
Pro Disk Network validates every 40GB-LR4-QSFP 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 40GB-LR4-QSFP ship?
Pro Disk Network dispatches the 40GB-LR4-QSFP same-day on orders confirmed before 3 pm ET. Multi-pallet projects requiring crating ship within 2 business days. International shipping (Canada, Mexico, EU, APAC) takes 3-7 business days via DHL Express or FedEx International Priority.
What is the warranty on the 40GB-LR4-QSFP?
New 40GB-LR4-QSFP units carry the full Enterasys 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 40GB-LR4-QSFP?
Email sales@prodisknetwork.com with the quantity and target ship date for a quote within one business day.
Optic Coding, Vendor Lock-In, and Multi-Vendor Compatibility
If you are running a multi-vendor leaf-spine architecture (Arista leaves and Cisco spines, for example), order optics coded for each endpoint separately. Optics in DAC and AOC cables are factory-coded to each end and cannot be flashed in-field. Plan the coding split at design time and document it in your network drawings.
Bandwidth Sizing for Spine-Leaf, EVPN-VXLAN, and Hyperconverged Storage
Sizing network bandwidth for a leaf-spine fabric using the 40GB-LR4-QSFP starts with the workload mix. For general-purpose virtualisation, plan 10G server-to-leaf, 25G or 40G leaf-to-spine; oversubscription up to 4:1 is acceptable. For hyperconverged storage (vSAN, Ceph, Storage Spaces Direct), plan 25G server-to-leaf at minimum, 100G leaf-to-spine, oversubscription 1.5:1 maximum. East-west traffic dominates in HCI clusters and starves on oversubscribed fabrics.