T-DMB/DAB Configuration and Settings
R&S
®
SMCVB-K156
27
User Manual 1179.1029.02 ─ 02
"SFN"
, all transmitters in a network are tuned to the same fre-
quency and have frequency coupling (based on the 10
MHz refer-
ence output of a GPS receiver). In addition, it is necessary in an SFN
network to compensate any signal delays that occur in the program
data supply.
This involves the use of a GPS receiver, see also
on page 26, and time stamps (TIST) inserted into the
stream. The maximum delay in the network is set on the ETI multi-
plexer and represents the maximum delay which can occur in the pro-
gram data supply at the most remote transmitter in the network.
If a time stamp was received at the SFN transmitter, its modulator will
measure the dynamic delay with respect to its own received seconds
pulse from the local GPS receiver. From this information, together
with the processing delay (of the modulator), the RF delay (from mod-
ulator to antenna) and the optional static delay, it will compute the
local delay value which the supplied ETI stream must undergo to
attain data synchronicity in the network. Note that it is critical for the
incoming ETI stream to be absolutely identical for all of the transmit-
ters in the network, that means it may not be changed in any way.
Note that the modulator operates with TIST level
5 at any time.
"MFN"
, there is no mandatory coupling between an individual
transmitter and the incoming transport stream (based on the seconds
pulse from a GPS receiver). In addition, the transmitters are not
synchronized with one another based on a common reference and
output frequency. You can select the modulation parameters of the
transmitters involved in the network.
Remote command:
TII
Enables/disables the transmission of the
signal.
The TII signal is used to identify each individual transmitter.
"On"
Transmits a TII signal during the null symbol.
"Off"
Transmits no TII signal.
Remote command:
[:SOURce<hw>]:BB:TDMB:TII:STATe
TII Main ID
Remote command:
[:SOURce<hw>]:BB:TDMB:TII:MAIN
TII Sub ID
Remote command:
Network Settings
