Chapter 20 - Upstream monitoring system UMS 139
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Upstream monitoring system UMS
Chapter 20
20.1
Introduction
The Upstream Monitoring System (UMS) is a measuring system consisting of a device in the
headend and one or several handheld devices (also called field devices). The UMS permits to
measure the return path in a DOCSIS network. Two different devices are supported as headend:
•
The first is the
UMS
for the AMA310 Headend UMS device which permits the following
measurements: wobbling (frequency response measurement), TILT measurement (tilted
position measurement), BER measurement, MER measurement, constellation diagram, real-
time spectrum. The measurements can be performed with the DOCSIS modems in operation.
•
The second is the
X16
for the Kronback X16/KWS device which supports the measurements
wobbling, TILT and real-time spectrum, also when the DOCSIS modems are in operation.
The data transmission from the headend to the handheld devices is done via transport stream and
DVB-C modulation. If the headend disposes of a transport stream multiplexer, the UMS data
stream may be added to an existing DVB-C-channel.
Further information may be taken from the Application Note "AN006 - Upstream-Monitoring-System
UMS" on www.kws-electronic.de under "SUPPORT" -> "Application Notes".
20.2
Unlock of the software option
If the handheld has been retrofitted with the software option UMS and has not yet been unlocked in
the factory, the device can be unlocked with the 8-digit code provided as an option.
First change to the TV range:
RANGE
->
TV
Then open the item SoftwareKeys in the mode menu:
MODE
->
Settings
->
SoftwareKeys
.
Select the UMS option (Upstream Monitoring System) and enter the 8-digit code. After successful
activation a note in green "Option activated!" confirms the activation. Now the Upstream Monitoring
Systems are available as new range
RC-MEASSYS
. See also chapter 17.14 - Activating software
options.
20.3
Settings on the field device
Before using it with the headend, the DVB-C channel used for data transmission and the relevant
service ID of the data channel have to be set in the field device: The UMS mode is selected via
RANGE
->
RC-MEASSYS
->
UMS
/
X16
. Now the settings can be made via the mode menu.
20.3.1
DVB-C channel
This presetting can be made directly as channel frequency or also as channel number.
MODE
->
Channel frequency
: change to the relevant position with the
←/→
keys and the
↑/↓
keys or enter the desired figure directly. Confirm it by pressing
ENTER.
