Product Overview
The 30 Watt Brick That Puts a Cisco Access Point Where the PoE Switch Does Not Reach
Condition
Used, clean, and in very good condition. This is the single photographed unit, not a representative sample: one injector, one AC mains cord, exactly as shown. The label is fully legible and both RJ-45 jacks are undisturbed in the photos. Tested, used unit in good working condition. No Ethernet patch cable and no printed documentation are included.
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Product Overview
This is a Cisco power injector, marked on its underside label P/N 341-0212-01 REV:A0, MODEL DPSN-35FB A, with the barcode DCA152714YP. It takes 100-240V AC at 0.8A, 50/60Hz from the wall and puts 56V DC at up to 0.55A onto the Ethernet run, which works out to roughly 30 watts of delivered power. The end panel carries two RJ-45 jacks marked To AP and To Switch and three indicator windows marked AP Power, Fault and AC Power, all of them photographed here. The idea is simple: the switch end of the run stays a plain data port, and the injector adds the power on the way to the access point, so an AP can hang where no PoE-capable switch exists. Reseller sources identify Cisco part number 341-0212-01 as the injector Cisco sold as AIR-PWRINJ4; that mapping comes from resellers rather than from a Cisco document, so we pass it along attributed rather than as a Cisco statement. The label itself is blunt about scope: "Only for use with Cisco products."
Key Features
- Cisco power injector, label marked P/N 341-0212-01, REV:A0
- Model DPSN-35FB A, the Delta build of this Cisco part number
- Input: 100-240V AC, 0.8A, 50/60Hz
- Output: 56V DC, 0.55A, about 30 watts
- Two RJ-45 ports marked To AP and To Switch
- Three indicator windows marked AP Power, Fault and AC Power
- Mounting tab with a screw hole molded into the housing
- Agency marks on the label: UL c-us listed I.T.E. file E254038, FCC, CE, CCC S&E, TUV Rheinland Argentina S-mark, RCM N906, PCT ME61, KC HU10291-7002A
- Label states "Only for use with Cisco products"; marked Made in China
- Black two-conductor AC mains cord included, as photographed
Applications
- A network tech hanging a Cisco access point in a warehouse corner where the nearest closet switch has no PoE budget left
- A school or small-campus IT group keeping a spare injector on the shelf so a dead brick does not take an AP offline for a week
- A lab or bench setup powering a single Cisco AP for firmware work without dragging a PoE switch onto the table
- A home lab running one Cisco AP off an ordinary unmanaged switch
Frequently Asked Questions
Which Cisco access points will this injector power?
Cisco's own access point power reference lists the AIR-PWRINJ4 injector for the Aironet 1700, 1850 and 3700 series. Reseller listings extend that to the earlier 802.11n generation the injector shipped alongside, including the 1140, 1250, 1260, 3500 and 3600 families; that broader list is reseller data, not a Cisco statement. Check your access point's power requirement against Cisco's documentation before you order.
Is this an 802.3at or PoE+ compliant injector?
Not confirmed, and we will not claim it. The 56V at roughly 30 watts sits in that power class, but no Cisco document we reviewed calls this unit 802.3at compliant, and the label restricts it to Cisco products. Verify against the datasheet for your access point before use.
What exactly ships in this order?
The injector shown and the black AC mains cord shown with it. Nothing else is in the photos and nothing else is promised: no Ethernet patch cable, no mounting hardware, no printed literature.
Why buy a used injector instead of a sealed one?
Because you are looking at the actual piece. There is one of these on the shelf, it is photographed from three angles with the rating label legible, and what you see is what ships. In exchange you are taking on used-equipment risk: it is a tested, used unit in good working condition, and there is no manufacturer warranty behind it. If that trade works for a spare, a bench supply or a single AP drop, this is a straightforward way to get a 56V Cisco injector without hunting a pallet of unknowns. Shipping is a flat $8, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Cisco printed "Only for use with Cisco products" on the belly of a box whose entire job is reaching places the switch could not. Hang it behind a ceiling tile, forget it exists for five years, and let it go back to quietly pushing 56 volts down a cable for somebody else.
