User's Manual

ISO 9001:2000 Cert. N°4500/1
Version 1.1 SDT_ARK6_User_Manual_ENG_vATSC Page 193 of 206
Appendix A. Automatic input source selection methods
A.1 Input Autoswitch
The SDT ARK62 series supports an automatic switching control mechanism between incoming signal sources.
The ARK6 is capable of switching between inputs on the basis of primary feed quality, depending on how it is
presented to the transmitter (RF, ASI – Ethernet, SDI and CVBS feeds). The feed switching algorithm is
irrespective of payload and bitrate of both primary and reserve feeds.
The primary input is selected from the drop-down list of Input Selector. It is not allowed to dynamically change
the preferred input until the Input Autoswitch is enabled. Secondary inputs are checked in circular order,
starting from the one that follows the primary input. The numerical order is:
DVB-T - T2 - ISDB-T - ATSC
ITU
1. ASI 1
2. ASI 2
3. ASI 3
4. ASI 4
5. Tuner 1/Tuner (if available)
6. Tuner 2 (if available)
7. GbE 2 ch1
8. GbE 2 ch2
1. SDI 1
2. SDI 2
3. SDI 3
4. SDI 4
5. CVBS 1
6. CVBS 2
E.g. In DVB-T2 mode, if Tuner is set to priority the algorithm for selecting secondary inputs starts with GbE 2
Ethernet channels and then works down all other ASI inputs starting from ASI 1.
If the reserve feed, the one being used, does not meet anymore the necessary quality requirements, the
secondary to secondary input switch mechanism will start from the input that follows the primary input.