Dualcomm DECA-100/DECA-200 EoC Kit Installation Guide
This installation guide explains proper installation and safe handling practices for Dualcomm’s DECA series of Ethernet-over-Coax (EoC) adapters.
All procedures and precautions described here apply to:
DECA-200 / DECA-200-10M (PoE-over-Coax)
DECA-100 (Ethernet-over-Coax)
1. Kit Contents & System Overvie
DECA-100 Ethernet-over-Coax Kit
Includes two identical DECA-100 EoC adapters
Transports Ethernet only (no PoE)
DECA-200 / DECA-200-10M PoE-over-Coax Kit
Includes one DECA-200A (local unit)
Includes one DECA-200B (remote unit)
Transports Ethernet + PoE to power remote devices such as IP cameras
Additional Required Components (Both Kits)
Two Ethernet patch cables
One between local adapter and switch
One between remote adapter and end device
Use the shortest patch cables possible (0.5 ft recommended)
One coaxial cable connecting the two adapters
Ethernet Switch → (short patch cable) → Local Adapter === Coax === Remote Adapter → (short patch cable) → End Device
2. Important Warning: Do Not Leave the Remote End Open
If the local adapter is connected to the switch while the far end of the coax is not yet connected, Ethernet signals may reflect back into the switch, causing:
Internal looping inside the switch
Network-wide instability
Always ensure the remote end is fully connected before connecting the local EoC adapter is connected to the switch port.
This applies to both DECA-100 and DECA-200 kits.
3. Correct Connection Order (Recommended Practice)
Step 1 — Connect the remote end first
Connect remote EoC adapter → end device (short patch cable)
Connect the coax to the remote adapter
Step 2 — Connect the local end last
Connect the coax to the local EoC adapter
Connect the local EoC adapter → switch (short patch cable)
4. Proper Disconnection Procedure
Disconnect the switch port FIRST.
Unplug the Ethernet patch cable from the switch
Then disconnect:
Coax cable
Remote and local EoC adapters
End device
5. If a Loop or Reflection Condition Occurs
If the switch reports a loop or the network becomes unstable:
Power-cycle (reboot) the switch to clear the internal looping condition.
6. Enable Switch Loop Protection (If Available)
If your switch supports Loop Detection/Loop Prevention, enable these features.
They help detect and suppress looping in the PoE switch.
7. Summary of Best Practices
DECA-100 kit → two identical adapters
DECA-200 kit → one DECA-200A + one DECA-200B
Use two short patch cables (0.5 ft recommended)
Never leave the remote end open
Connection order: remote → local → switch
Disconnection order: switch → local/remote
If looping occurs, reboot the switch
Enable loop detection/prevention if supported