Guide to Select PoE Injectors for Cambium Radios

Selecting the wrong PoE injector is one of the most common causes of radio damage, instability, or under‑power faults. Cambium radios are not IEEE 802.3af/at standard PoE in most cases; they require specific passive PoE voltages and wattage levels.

This guide explains how to select the correct PoE injector or power supply using the device requirements shown in your table.

1. Key Selection Criteria (Always Check in This Order)

1. Required Output Voltage

Cambium radios operate primarily at:

• 30V Passive PoE
• 48V DC
• 56V Passive PoE

⚠️ Never substitute voltages. A 56V injector on a 30V radio will permanently damage the unit.

2. Power Consumption (Wattage)

Each radio has a maximum power draw.
Your PoE injector or power supply must support at least 20–30% headroom above the radio’s rated wattage.

Example:

• Radio requires 35W
• Select injector rated ≥45W

Aux power (if supported) increases total demand.

3. AUX Power Requirement

Some radios support or require auxiliary power output:

• Often used for GPS modules, heaters, or accessories
• Denoted in the table as “With AUX Power”

If AUX power is listed, do not use a basic injector.

4. Power Input Type at Site

Determine what power is available:

• AC input PoE injector (most common)
• AC+DC power supply (for redundancy)
• DC input PoE (solar, battery, or DC plant)
• DC-only power supply (RRH use cases)

2. Cambium Product Families and Correct Powering

PTP Series (Point‑to‑Point)

✅ Rule:
If AUX power is required on PTP 600/700 series, use AC+DC supplies, not small injectors.

cnWave 60 GHz

✅ Tip:
For rooftop or cold‑climate deployments, choose higher‑capacity injectors even if AUX power is unused.

PMP 450 / 450m Series

⚠️ High‑band and 3 GHz PMP radios require high‑power supplies only.

ePMP Series

30V Models (Most ePMP SMs and Force Radios)

✅ Golden Rule:
If ePMP = 30V, always use N000900L001D.

56V ePMP Models

cnRanger (LTE)

⚠️ RRHs do not use PoE injectors. DC power only.

3. Common Mistakes to Avoid

❌ Using IEEE 802.3af/at switches
❌ Mixing 30V and 56V injectors
❌ Undersizing wattage for AUX power
❌ Using long CAT5 runs with low‑power injectors

✅ Always use Cambium‑approved part numbers

4. Quick Decision Flow

1. Identify radio model
2. Confirm required voltage
3. Check max wattage + AUX
4. Confirm AC or DC available
5. Select Cambium‑approved injector or power supply

5. Field Recommendation

If you standardize inventory:

• 30V: N000900L001D
• 56V ≤30W: N000000L034B
• High‑Power 56V / AUX: C000065L002D
• RRH DC: N000000L129A

This minimizes errors and truck rolls.