Promax DT-802 Mode D'emploi page 87

CONTROL MODULE. DT-802
MER: It is the Modulation Error Rate. It is a measure that allows knowing
how good a modulated digital signal is. It is the equivalent of the
information provided by the signal/noise rate in the analog
modulations.
DL-FREQUENCY: It is the downlink frequency from a satellite to the Earth. It is
equivalent to adding local oscillator frequency plus intermediate
frequency of a signal.
SYMBOL RATE: In digital communications, symbol rate, also known as baud or
modulation rate; is the number of symbol changes (signalling
events) made to the transmission medium per second using a
digitally modulated signal or a line code. The Symbol rate is
measured in baud (Bd) or symbols/second. In the case of a line
code, the symbol rate is the pulse rate in pulses/second. Each
symbol can represent or convey one or several bit of data. The
symbol rate is related to but should not be confused with gross
bitrate expressed in bit/s. A symbol is a state or significant condition
of a channel of communication that persists for a period of time.
The transmiter instrument puts the symbols in the channel at a
known rate of symbols, and the receiving device has to identify the
sequence of symbols in order to rebuild the data transmitted.
NID: It is the Network IDentifier. It is a four-digit code composed by four
digits, as an international numbering plan for public data networks.
The first three digits are considered the country indication for data,
and the fourth digit identifies a network of that country. To find the
one corresponding to your country, access the attached link:
http://www.dvbservices.com/identifiers/network_id.
LCN: It a number that identifies the Logical channel number.
PID: It is the Packet IDentification, a number that identifies a service of a
program.
CAM: A conditional access module (CAM) is an electronic device, usually
incorporating a slot for a smart card, which equips an Integrated
Digital Television or set-top box with the appropriate hardware
facility. This enables you to view conditional access content that
has been encrypted using a conditional access system. There is not
an unique CAM that allows working with all the existing formats
encrypted, it depends on the system of encrypted digital platform
you are using.
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