Enterasys STK-RPS-150PS Redundant Power Supply – Obsolete STK Series Spare Part

Technical Dossier

Product Details And Specifications

Enterasys STK-RPS-150PS Redundant Power Supply – Obsolete STK Series Spare Part

When an Enterasys STK-series stackable switch loses its redundant power supply, the failure is rarely just a hardware inconvenience. For facilities running legacy network infrastructure built around the Enterasys S-Series or K-Series ecosystem, a single failed RPS module can cascade into unplanned downtime across the entire stack. Replacing the full switch stack — or worse, re-architecting the network segment — carries a capital cost that routinely exceeds six figures when engineering labor, new licensing, and production interruption are factored in. The STK-RPS-150PS is a discontinued component. Enterasys Networks was absorbed into Extreme Networks in 2013, and the STK hardware line reached end-of-life shortly thereafter. Authorized channel stock has been exhausted for years. DriveKNMS maintains verified physical inventory of this unit for operations that cannot afford to treat a power supply failure as a network modernization trigger.

Technical Specifications

Note: Electrical parameters beyond those listed above are not independently verified by DriveKNMS. Specifications are sourced from original Enterasys product documentation. Do not substitute unverified third-party parameter data for safety-critical installations.

Solving the Discontinued Hardware Crisis

The Enterasys STK platform was engineered for enterprise and campus network environments where switch stacking reduced management overhead and provided deterministic failover. Facilities that deployed these stacks in the 2005–2012 window built their network topology around the STK interconnect architecture. That topology does not translate cleanly to modern alternatives without a full re-cabling and re-commissioning project.

The STK-RPS-150PS is not a peripheral accessory — it is the component that keeps the primary power path protected. Without a functioning RPS module, the switch stack operates on a single power feed. In industrial, healthcare, or data center environments where uptime SLAs are contractual obligations, that exposure is unacceptable.

Factory and facilities managers facing pressure to retire legacy Enterasys infrastructure should weigh the actual cost of that decision against the cost of maintaining it. A verified replacement RPS module sourced from DriveKNMS extends the operational life of the existing stack by years, at a fraction of the cost of a forklift upgrade. The engineering hours alone required to migrate switch configurations, update spanning tree topology, and re-certify the network segment in a regulated environment frequently dwarf the cost of the spare part by an order of magnitude.

How to extend your Enterasys STK stack life by 5–10 years through targeted spare parts management:

• Identify single points of failure first. The RPS module and the stacking cables are the two components most likely to cause full-stack failure. Holding one spare of each eliminates the most common failure modes without requiring any configuration changes.
• Audit firmware versions before sourcing hardware. Enterasys STK switches running older firmware may have compatibility constraints with replacement modules. Confirm the firmware revision on your active units before procurement.
• Establish a cold-spare inventory policy. For a stack of four to eight switches, one spare RPS module and one spare stacking module represent a low-cost insurance policy against a multi-day outage. The carrying cost of that inventory is negligible against the cost of emergency network re-architecture.
• Document your stack configuration now. If the day comes when the hardware genuinely cannot be sustained, a fully documented configuration accelerates migration. That documentation costs nothing to produce today and is invaluable under pressure.
• Engage a specialist supplier early. Obsolete Enterasys inventory is finite. Units available today may not be available in 18 months. Procurement decisions made under emergency conditions — when a unit has already failed — result in higher prices and longer lead times.

Condition & Reliability Assurance

DriveKNMS applies a five-step quality process to all obsolete power supply units before shipment:

• Step 1 – Visual and mechanical inspection: Full external inspection for physical damage, pin corrosion, connector wear, and housing integrity. Units with compromised connectors are rejected at this stage.
• Step 2 – Electrolytic capacitor assessment: Aging electrolytic capacitors are the primary failure mechanism in power supplies of this vintage. Each unit is assessed for capacitor condition. Units showing visible bulging, leakage, or ESR anomalies are not shipped.
• Step 3 – Firmware and label verification: Where applicable, firmware version and hardware revision labels are cross-referenced against Enterasys documentation to confirm the unit matches the listed part number.
• Step 4 – Functional power-on test: Units are powered on and output rails are verified under load conditions prior to packaging.
• Step 5 – Packaging and ESD protection: Units are packaged in anti-static materials with physical protection appropriate for international freight.

Condition is disclosed at time of quotation. DriveKNMS supplies both new old stock (NOS) and professionally refurbished units depending on available inventory. Condition grade is confirmed in writing before any order is placed.

Key Features for System Maintenance

• Drop-in replacement: The STK-RPS-150PS installs directly into the RPS bay of compatible Enterasys STK-series switches. No configuration changes, no firmware updates, and no re-programming of the switch stack are required.
• No engineering re-architecture: Replacing a failed RPS module with an identical unit preserves the existing network topology, spanning tree configuration, and stacking hierarchy. The alternative — replacing the switch — requires re-commissioning the entire stack segment.
• Avoids forced modernization costs: A single verified spare part defers a capital expenditure that, when fully costed (hardware, licensing, engineering, downtime, re-certification), routinely reaches six figures in enterprise environments.
• Immediate dispatch: DriveKNMS ships from verified physical stock. Lead times are not subject to manufacturer production schedules or distributor allocation queues.

FAQ

What warranty applies to an obsolete part like the STK-RPS-150PS?
DriveKNMS provides a 90-day warranty against DOA (dead on arrival) and functional failure under normal operating conditions. Warranty terms are confirmed in writing at time of sale. Extended warranty options are available on request.

How do I know the unit is genuine and not a counterfeit?
All units sourced by DriveKNMS are physically inspected and, where possible, cross-referenced against original Enterasys documentation and hardware revision markings. We do not source from unverified secondary markets. Provenance documentation is provided where available.

Should I buy more than one unit?
For any facility running a production network on Enterasys STK hardware, holding at least one cold spare RPS module is a defensible risk management decision. This inventory is finite and will not be replenished by the manufacturer. Units purchased today are available; units needed under emergency conditions in 24 months may not be.

Can you source other Enterasys STK components?
Yes. DriveKNMS maintains inventory across multiple Enterasys product lines including stacking modules, line cards, and chassis components. Contact us with your full bill of materials for a consolidated quote.