Internal Decoder; Introduction; Alteia And A Variant - TANDBERG Alteia Instruction Manual

B.2

Internal Decoder

B.2.1

Introduction

The Alteia range of Receivers and Decoders contains an internal decoder.
This circuit incorporates a packet demultiplexer that selects audio, video
and ancillary services from the stream received from the digital
demodulator. These services are locked to the transmission rate using
clock phase information from the incoming multiplex.
B.2.2

Alteia and A Variant

The maximum transport stream bit-rate that can be de-multiplexed is
affected by the incoming video bit-rate. Table B.9 shows the effect of the
transport stream output as a result of the incoming video bit-rate.
Table B.9: Output Transport Bit-rate against Incoming Video Bit-rate
Incoming Video Bit-rate
<30 Mbit/s
>30 Mbit/s
The decoder operates with user data rates (excluding Reed-Solomon
overhead) as shown in Table B.10.
Table B.10: Maximum User Bit-rates (Software version 2.3 and later)
Code Rate
½ Rate FEC
2 / Rate FEC
3
¾ Rate FEC
5 / Rate FEC
6
/ Rate FEC
7
8
8 / Rate FEC
9
B.2.3 Alteia plus
The Transport Stream bit-rate in the Alteia plus versions is not dependent
on the incoming video bit-rate.
Instruction Manual: Alteia and Alteia plus Professional Receivers and Decoders
ST.TM.E9200.8
Software Version 2.1 and 2.2
Transport Stream Maximum
Bit-rate
54 Mbit/s
50 Mbit/s
QPSK symbol rate
1.0 MSym/s
0.92
1.23
1.38
1.54
1.61
—
Software Version 2.3 and later
Incoming Video Bit-rate
<30 Mbit/s and PDU models
>30 Mbit/s
User Input Bit-rate (Mbit/s)
44.5 MSym/s 3.0 MSym/s
41.01 —
54.68 —
61.51 —
68.34 6.91
71.76 —
— 7.37
Technical Specification
Transport Stream
Maximum Bit-rate
54 Mbit/s
50 Mbit/s
8PSK symbol rate
30 MSym/s 28.125 MSym/s
— —
— —
— —
69.11 —
— —
— 69.11
Page B-7