Optional hardware

HE 310

Hardware option 24-fold RF switch SW 024

Option 1: 24-fold RF switch SW 024

The SW 024 cluster switch can be used to switch up to 24 upstream RF signals.

Option 2: The step to a high-end return path monitoring system—combination with field device VAROS 107

The result: traditional AND quality measurements in the return channel

1 VAROS 107 measurement possibilities

Cluster selective:

  • Measurement of the frequency response in the return path (sweeping)

  • Comfortable adjustment of return path amplifiers (in-house and line)

  • Display of MER, BER, noise margin and constellation diagram of modulated test carriers in the return path

  • Automated measurements with protocol generation

  • Ranging to reference level (forced by headend device)

Sum signal and cluster selective:

  • Display of the received spectrum (in the headend) in real-time

  • Max-hold and waterfall diagram display

  • Registration and deregistration of field devices for exclusive measuring access (signaling via telemetry frequencies in return channel)

VAROS 107 as optional hardware for HE 310
HE 310 and VAROS 107: Illustration of the function

2 HE 310 with SW 024 (optional)

The SW 024 allows for an optional extension to up to 24 upstream clusters: switching of field devices on one cluster; creation of a sum signal out of all 24 clusters. Thus measurements can be performed cluster selective or with the sum signal.

  • Real-time spectrum of the return path range (5–65 MHz) as well as max-hold function

  • Measurement of modulated test carriers (transmitted by VAROS 107) in the upstream with MER, BER and constellation diagram

Interaction with VAROS 107

  • Bi-directional communication between HE 310 and VAROS 107 possible over the HFC network

HE 310: standalone mode usable as real-time spectrum analyzer with max-hold function (sum signal and cluster selective).


Hybrid Fiber Coax Network: Optical and coax cable distribution network for downstream and upstream from the headend to the subscriber.

4 Transfer of measurement data to …

the head-end equipment

  • as MPEG-2 data stream over Ethernet (UDP and RTP)

  • as MPEG-2 data stream over ASI

In the headend these data streams can be multiplexed in existing DVB-C channels as a separate data service.

Real-time spectrum analyzer

The heart of the HE 310 is a real-time spectrum analyzer. Typical errors are reliably detected like e.g. an increased noise floor, short-term ingress interferers or a TILT in the upstream frequency range.

The Max-Hold function in real-time guarantees for a detection of even shortest ingress events.

HE 310: Real-time spectrum
HE 310: Return channel PRBS

Also in the return channel: Quality is what counts

In addition standard (and well know from the downstream) RF measurement parameters such as MER and BER or constellation diagram can be gathered and transmitted back to the field devices VAROS 107.

For this purpose test signals transmitted by the field devices are highly precisely measured by the HE 310.

Never bevor amplifier line-up has been so easy

No matter if attached to the house or a line amplifier—The line-up toolbox guides you through leveling and equalizing the return channel—safe and easy.

HE 310: Amplifier line up
HE 310: Wobbeling

Still standard in the return channel: Wobbeling (frequency response measurement)

The frequency response measurement is done without affecting active modem connections. The zoom function helps when evaluating details.

The protocol function is only one push of a button away:

One push of a button is enough to execute all measurements possible with the system and to store the results as a protocol in XML format. Also for the protocol generation no previous knowledge is necessary.

Some user editable control elements allow for a fast assignment of a protocol to the measurement location, a customer, a field technician, a measurement situation and so on.

HE 310 report


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