10
5.5.
NIT
Several tables related to NIT generation exist in this section. Figure 14 "Global TS parameters" describes following TS
parameters:
Figure 14. Global TS parameters
“Network ID”: is unique number within the geographical region defined by the “country code”. For a cable network usually
this is a single country code plus 0x2000 (8192). If there are more connected modulators in the network, they must have the
same Network ID.
Proper value depending on your country and operator can be found here:
http://www.dvbservices.com/identifiers/network_id?page=1
“Private data specifier (hex)”: can be inserted in the NIT table for proper LCN description. This value is described in TS
101162 specification. NorDig standard requires 00 00 00 29 value, UK should use 00 00 23 3A value.
Other options can be found here:
http://www.dvbservices.com/identifiers/private_data_spec_id?page=1
The parameter will not be inserted into NIT if value is set to zero.
„Network name“ is the name of the network.
The 2
nd
table in the page describes Transport stream ID and Original network ID of each channel (see Figure 15). Each
stream in a network must have unique ID, called „Transport stream ID“. An Original_Network_ID is defined as the “unique
identifier of a network”. It can be linked to Network ID or used value from this location:
http://www.dvbservices.com/identifiers/original_network_id?page=1
Figure 15. Transport stream and original network IDs
Figure 16. Description of other streams in the network
Every channel in the network must be described in NIT. Otherwise TV automatic channel tuning function will not find all
channels. All devices in the network will be monitored via standard SSDP protocol. NIT tables will be regenerated if any
change is detected in other modulators with the same Network ID. Make sure, that Ethernet router is configured properly to
pass SSDP packets (239.255.255.250:1900 and 239.255.255.246:7900). Also make sure that all devices are connected to
the same Ethernet network.
NOTE
: If in the RF network exists transponders that is generated by old TERRA transmodulators/modulators, the frequencies
and modulation parameters must be filled manually (Figure 16).
