8
AMD-53-S2 MODULATOR / MULTIPLEXER
The multiplexer function is available when the
is selected. The transport
IP-
˃
MUX INPUT MODE
stream is fed to the modulator output through 120-channel multiplexer.
SERIAL No.
is unique for each device. This number must be specified when ordering an additional
TROPHY-ACCESS license.
SCRAMLER
function is working if TROPHY-ACCESS license added.
The license can be included in the factory in case of prior order. Otherwise, the license can be installed
by entering the text key received from the manufacturer after confirming the license order.
BILLING SERVER
address can be specified if a TROPHY-ACCESS scrambled signal is at the
modulator/multiplexer output. In this case, the subscription information (list of included decoders and
rights to view of program packages) should be present in the stream.
PCR RESTAMPING
(PCR - Program Clock Reference)
Synchronization of the receiver System Time Clock (STC) with the transmitter STC depends on
transmitting PCRs through a constant-delay portion of the system. Thus, PCRs are inserted following
the encoder buffer and extracted before the receiver buffer. PCRs are inserted with a maximum interval
of 100ms.
Synchronization can be adversely affected by transmission over links having a variable delay or time
jitter (IP transport, for example), and the accuracy of clock recovery must be studied if such an
application is contemplated.
PCRs are also affected by the multiplexing of multiple program streams. In this case, there is additional
buffering in the multiplexer, and it may become necessary to re-stamp the PCR values of data that is
transmitted earlier or later than expected. Although the MPEG standards provide the means to maintain
synchronization in this case, they do not specify the jitter limits, suggesting only that it is "intended" to be
+/-4 ms maximum in a well-designed system.
INSTRUCTION MANUAL
