Promax 26 Mode D'emploi page 66

By means of the Generator function, it is possible to define all the
characteristics of a test signal in order to equalise the transmission band (UPSTREAM)
correctly.
As a Spectrum Analyser it provides the analysis of the entire band, with a
span defined by the user from 1 to 100 MHz. Furthermore, it is possible to alter the
reference level, and to select the detection mode between peak and average.
The PROMAX-26 also works as a DOCSIS and EuroDOCSIS systems
analyser for installation and maintenance of high-speed interactive video and data
services as well as voice (Internet, telephony and TV on demand) over coaxial networks
based on the DOCSIS / EuroDOCSIS (Data Over Cable System Interface Specification)
standard.
The instrument communicates with the Cable Modem Terminal Server (CMTS)
located at the headend through the return band for upstream and forward band for
downstream.
It admits two operating modes: registered and unregistered. In unregistered
mode, the PROMAX-26 displays important parameters of the DOCSIS/EuroDOCSIS
system, such as attenuation in the return band, frequency used, modulation error ratio
(MER), constellation diagram or power in digital channels.
In registered mode it is possible to meter statistical data on transmission
packets on the network or view the assigned IP address.
As a DOCSIS/EuroDOCSIS system analyser, the PROMAX-26 is capable of
the following measurements:
Downstream:
Upstream:
Communications Test (Registered mode):
Page 2
- Channel power measurement
- Evaluation of quality: MER and BER
- Constellation diagram
- Power levels for a frequency band
- Frequency, channel and active channel plan
- Modulation type and symbol rate
- Power level measurement
- Attenuation at CMTS
- Frequency and bandwidth
- Modulation and symbol rate
- Constellation diagram
- Communications test
- IP report
- Ping test
- Packet loss ratio
- Packet expected time
USER'S MANUAL. PROMAX-26
02/2007