Relay Node (RN)

If you have multiple coaxial segments to cross the HelEOS system need a refresh of its signal. In classical HFC architecture the signal is amplified and equalized in the analog domain. The relay node is doing a full digital signal refresh and demodulation and remodulation so that the data signal has the same quality as it was send in the first node site.

The system was designed to operate parallel to existing DOCSIS and DVB-C services in an HFC access network. Diplexer or better triplexer provide the access to the HelEOS frequencies.

HelEOS Relay Node paralle to a HFC trunk amplifier

The delay introduced by a HelEOS hop is less than 10 microseconds so that longer cascades can be built with nearly fiber like behavior.

Technical Data


Ethernet and USB Interfaces:

SUB-D 100 Mbit/s Ethernet connector

USB OTG port for local management


Management Interfaces:

Local Management via RJ45/SFP or USB OTG port

Remote Management to downstream or upstream HelEOS node via in-band RF link

Management protocol: ssh CLI, GUI application TCP/IP or SNMP V2/V3


10G RF interface:

Coaxial Connector:  F-Type 75 Ohms

Frequency Division Duplex up to full duplex 10 Gbit/s downstream plus 10Gbit/s upstream

Frequencies: 400 MHz – 4 GHz

Max baud rate 1.6 GHz

Link budget: -54dB at QAM 1024 and -81dB at BPSK


BPSK, QPSK, 16, 31, 64, 128, 256, 512, 1024 QAM with error free adaptive modulation


Timing and Delay:

Ethernet frame single hop delay: 10us

System supports Synchronous Ethernet clock transfer

Synchronization PTP 1588V2 transparent clock.


Operation properties:

Power supply:

  • 24 V DC, allowed range 21 V – 26 V DC
  • power consumption is 44W, typical 40W, eco mode with lower performance 30W

Relative humidity

  • 10 % to 90 %, non-condensing


  • Operating ambient temperature: -25°C to 55°C


  • CE certificate
  • ESD protection according to IEC 61000-4-2 level 4:
    • ±8kV contact discharge
    • ±15kV air discharge
  • ESD protection according to IEC 61000-4-4 (EFT) (5/50ns) 20A (I/O), 40A (VDD)
  • ESD Protection according to IEC 61000-4-5 (Lightning) 4A (8/20μs)