Page 73 - Eurotek Catalogue
P. 73
BOARD PLUG-IN ek-sfn/1
“SFN ADAPTER”
The EK-SFN/1 works as an SFN adapter. The board is
composed by four ASI input (2 physical + 2 internal), two
ASI output and one GPS input. The block scheme of the EK-
SFN/1 is depicted on the next page. The user can selects, by
the menu, the ASI input to send to the MUX unit (see EK- Features
SFN/1 block scheme). It is possible to select the ASI input
present on the BNC 1 connector (ASI IN 1), the ASI input 4 different TS input
present on the BNC2 connector (ASI IN 2) or the ASI
transport stream coming from the internal lines connections GPS Reference
(INT MPX or INT DEC). SFN Time and Freq. Sync
It is also possible to set the Auto parameter that send on the Hierarchical mode
Mux unit, the first ASI input that is not in alarm conditions in TS Output up to 215Mbit/s
according with the following priority : ASI 1, ASI 2, Int Mpx
and Int Dec. The ASI input transport stream coming from the Complete web/SNMP
input selector, is muxed with the transport stream coming management
from the MIP section that it is synchronized with GPS Applications
receiver (1 pps signal).
The MUX unit, delete the stuffing from the input transport Digital Microwave Links
stream, insert the MIP table with data based on the GPS DTV, DVB-T, DVB-S
signal and re-insert the stuffing signal (Bit rate generator) to
generate the correct out bit-rate on the two ASI OUTPUT
connector (ASI OUT 1 and ASI OUT 2).
The output bit rate (Mb/sec) is automatically adjusted in
according with the DVBT parameter setted by the user (see
Settings menu).
The value of the output bit rate must be greater than the sum
of the input transport stream present on the MUX unit input
and the bit rate of the MIP table. If this relationship is not
verified, an alarm occurs (Fifo full).At the power-off or if the
board in not running correctly the ASI IN 1 is routed through
mechanical switch directly to ASI OUT 1. During normal
working condition, if the GPS signal is unlocked and the
"bypass if fail" variable is switched to Yes (see Settings
menu),the ASI IN 1 is routed on the ASI OUT 1.
