Cisco 3905 Adapter

The Cisco Unified SIP Phone 3905 adapter (CP-3905-PWR series) is currently in a transition phase due to the product's official retirement.

Product Overview & Technical Insights

The 3905 adapter is a critical accessory for the Cisco 3905 SIP phone, providing power when Power over Ethernet (PoE) is unavailable. CiscoCisco

• Key Specs: 100–240V AC input, outputting 48V DC at 0.2A. Cisco
• Compatibility: Specifically designed for the 3905 model; different from the "Power Cube" used for higher-end 7900/8900 series. CiscoGoogle
• Variants: Available in regional configurations like NA (North America), CE (Europe), and UK. CiscoGoogle

Market Trends & Lifecycle Analysis

The market for these adapters is shifting from active retail to replacement and legacy support as Cisco winds down the 3900 series.

• End-of-Life (EoL): Cisco announced retirement on April 29, 2026. The End-of-Sale date is October 28, 2026, after which official hardware will no longer be available. Cisco
• Migration: Cisco recommends moving to the Cisco Desk Phone 9811, which primarily uses PoE. Cisco
• Pricing Trends: Market prices for replacement units range from $11.99 for generic compatible versions to $120+ for original sealed units from specialist vendors. GoogleGoogleGoogle

Strategic Sourcing Note

For bulk needs, compatible 48V/0.2A adapters are available from electronics manufacturers at significantly lower price points ($5–$17) compared to original Cisco-branded units, though compatibility with the 3905's specific barrel connector must be verified. AlibabaAlibaba

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