Equipment Description
Page 7-8
Reference Guide: SM6610, SM6615, SM6620 and SM6625 Satellite Modulators
ST.RE.E10152.2
The ASI stream can be accepted in either byte mode or single packet burst
mode. In byte mode, the ASI stream consists of MPEG-2 data bytes
separated by an approximately constant number of K28.5 code words. In
single packet burst mode, the ASI transport stream consists of an entire
packet of MPEG-2 data bytes being transmitted and then a series of K28.5
code words until the next packet of data is ready to be transmitted.
Figure 7.3: Functional Block Diagram – IF Output Models SM6610 and SM6620
Analogue
I & Q
Baseband Card (S13129 / S13133)
FIFO
Buffer
Microprocessor
DVB
Encoding
Digital /
Analogue
Digital /
Analogue
Beacon Rx Input
(S13133 only)
ASI Interface
& Selector
ASI 1
ASI 2
Front
Panel
LCD
Keypad
LEDs
Backplane
Ethernet
x 2
RS-232 / 485
Host Controller Card
(S11340)
Reset /
Status
IF Out Main
I & Q Modulator
Synthesiser 1
Down-converter
Amplifier
and Gain
Control
IF Output Card (S10310)
Synthesiser 2
IF Out Monitor
I
Q