Silvercrest SL 65 T Bedienungsanleitung PDF herunterladen (Seite 52)

8 Glossary and abbreviations

Baud rate: The speed at which data is transferred via the serial port to the receiver. The number is in

bits per seconds.

Decimal/Hexadecimal: Hexadecimal is a system for representing numbers in base 16, rather than the

base 10 we normally use. The hexadecimal system requires 15 digits and a zero; conventionally the

letters A-F are used to represent the digits for that the decimal system cannot provide equivalents.

Hexadecimal notation is not usually important for the PC user (with the possible exception of

specifying base addresses) but is still quite important for the programmer. Its importance arises

because there is a very close correspondence between hexadecimal and the very important binary

numbering system that computers use internally. However, hexadecimal notation is much more

compact than binary.

The reason why you can select both systems in SetEdit is that many satellite operators use "even"

hexadecimal PID numbers. For example the audio PIDs on Astra transponder 11720 are in decimal

notation 256, 512, 768, 1024, 1280 etc., whereas in hexadecimal notation they are 100, 200, 300, 400

etc.

DLL: Dynamic Link Library. A Windows library file that can be shared by multiple applications.

FEC: Forward Error Correction. A system, in which redundancy is added to the message so that most

errors can be corrected dynamically at the receiver. Usual values are 1/1, 1/2, 2/3, 3/4, 5/6 and 7/8.

3/4 means that 3 out of 4 bits are reference data and the remaining one is for error correction.

LNB: Low Noise Block (converter). Amplifies received signals and converts them from microwave to

lower frequency signals that are then sent along a cable to the satellite receiver. An LNB can be either

single or double. A double LNB is required when more than one receiver is used allowing the viewing

of different satellite channels on other television sets.

PID: Program Identifier. A 13-bit code in the transport packet header. PID 0 indicates that the packet

contains a PAT PID. PID 1 indicates a packet that contains CAT. The PID 8191 (all 1 bits) indicates

null (stuffing) packets. All packets belonging to the same elementary data stream have the same PID.

The most important PIDs are the Video PID (for the video information), the Audio PID for the sound

and the PCR PID (Program clock reference) to get Video and audio synchronous.

If you enter an existing Service ID for a channel, the receiver can get all necessary information for this

channel. If you only enter the video and the audio PID, it may happen that you see the picture and

hear the sound, but EPG does not work because this information is transmitted on a different PID.

Usually the receiver finds the PIDs automatically, but occasionally (exotic channels) you have to know

them and enter them by hand.

Symbol rate: The amount of digital data that is transmitted per second via a transponder. This is

specified in Msymb/sec (Mega symbols per second), whereby a "Symbol" consists of 4 bits. The

symbol rate together with the FEC value can be used to calculate the bandwidth of a transponder.

Polarity: A satellite transmission signal has either a vertical, horizontal, or circular orientation; a

satellite can be all vertical or all horizontal; if a satellite is cross polarised, it can transmit both ways

and therefore has twice the delivery capacity.

Besides the horizontal and vertical polarisation we also find the circular polarisation. Circular

polarisation is not as easy to understand as linear polarisation, you can imagine that the waves are

rotating clockwise or anticlockwise. In this case we speak about LHC and RHC (left hand circular and

right hand circular).

As a rule in Europe linear polarisation (horizontal and vertical) is used. In Scandinavia and for C-band

reception circular polarisation is used.

Select: To select a channel please click with the mouse on the channel. To select more than one

channel you can use the usual windows methods.

When you press the shift key and click on a channel all channels between the currently selected and

the last selected channel are selected.

If you press the Ctrl key on the keyboard you can add single channels to your selection.

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