High-End Upstream-Measurement-System

AMA 310/UMS &

The new definition of return channel measurement …

This system combines the KWS devices AMA 310/UMS and VAROS 107 to a high-end monitoring system for the return path frequency range. An AMA 310 in a 19-inch version (3.5 RU) with UMS module is used in the headend, in the field the CATV handheld VAROS 107 is the counterpart.

Both devices communicate bi-directionally through the cable or HFC network to be measured. Thus no internet connection is necessary.

  • Frequency range from 5–65 MHz

  • Real-time spectrum analyzer

  • Frequency sweep (frequency response measurement)

  • Measurement of level, MER, BER and constellation diagram

  • Real-time constellation diagram

  • Modulated test channels up to 256 QAM and 6.4 MHz bandwidth

KWS-Electronic AMA 310/UMS: Representation Systemplan

For a clearer view and more flexibility: cluster selective measurement with 24-fold switch SW 024

SW 024: 24-fold RF switch

An optionally available 24-fold RF switch (model type SW 024) and the hand over of the measuring results to the head end equipment either in ASI format or as an IP data stream (UDP or RTP/UDP) lead to great flexibility when measuring as well as when connecting the entire monitoring system to the headend equipment.

The RF switch SW 024 (19-inch, 1 RU), which is available as a separate option to the AMA 310/UMS in the head-end, allows for measuring up to 24 clusters or CMTS upstream inputs separately.

The overall system: traditional AND quality measurements in the return channel

1 VAROS 107 measurement possibilities

Cluster selectiv:

  • 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 a field device for AMA 310/UMS
AMA 310/UMS: Illustration of how it works

2 AMA 310/UMS 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 AMA 310/UMS and VAROS 107 possible over the HFC network

AMA 310/UMS: 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.

AMA 3107UMS: Real time spectrum

Real-time spectrum analyzer:

The heart of the AMA 310/UMS 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 MaxHold function in real-time guarantees for a detection of even shortest ingress events.

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 AMA 310.

AMA 3107UMS: Return channel PRBS
AMA 3107UMS: Amplifier line up

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.

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.

AMA 3107UMS: Wobbeling
AMA 310/UMS: Report

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.

Option FTP

FTP stands for “File Transfer Protocol”. Together with SNMP it makes it possible to upload or download files to or from a 310 device. Currently the following new things can be done via FTP over the internet:

  • Upload and download tuning memory files (.mem files)

  • Upload and download user-defined channel tables (.cha files)

  • Download DataLogger result files (.xml files)

  • Download screenshots (.bmp files)

  • Upload firmware updates remotely and initiate the update process (.bin files)

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If you want to know more about the technical background …

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