The KTech VSB-FRQ-200 is an 8-VSB Receiver that demodulates 8-VSB terrestrial and QAM CATV signals (CH 1-125), updates PSIP VCT, and generates DVB-ASI and SMPTE-310 output signals simultaneously. This unit can also be used to convert DVB-ASI to SMPTE-310M, SMPTE-310M to DVB-ASI and RF to ASI and SMPTE-310M.
8-VSB RF Demodulation
An 8-VSB Demodulator demodulates 44.0 MHz I.F. signal into MPEG2 baseband signals. Its equalizer and Reed Solomon decoding techniques help correct channel multipath errors. It also performs digitally matched filtering to optimize performance over noise.
DVB-ASI or SMPTE-310M transport streams can be connected to the VSB-FRQ-200. These signals feed into interface decoders that generate output MPEG2 Transport Stream Signals. Note: The VSB-FRQ-200 can accept any DVB-ASI signal that has a rate less than or equal to 45 Mbps. If SMPTE-310M output is desired, the DVB-ASI Input should not exceed 19 Mbps.
Switch and Input Selector
All three present MPEG2 Streams are fed into the switch and the Input Selector chooses the MPEG2 stream that will be present at the output. The Input Selector is controlled using the Front Panel User Interface and the web-based GUI.
The baseband processing includes Null Packet Insertion and Removal, PCR Correction and PSIP Modification. The first step in this process is Null Packet Insertion and Removal. Note: Baseband Processing only occurs for DVB-ASI Inputs less than or equal to 45 Mbps. If SMPTE-310M output is desired, the DVB-ASI Input should not exceed 19 Mbps.
The Program Clock Reference (PCR), embedded within the transport stream, is used to synchronize a receiver's clock with an encoder's clock. The original PCR values that were stamped into the stream by the original encoder will not be the correct PCR values for the receiver after Null Packets are inserted into or removed from the stream .Therefore, PCR values need to be re-stamped so that the receiver will have the correct PCR values, avoiding PCR clock jitter at the receiver's end.
PSIP VCT's Station ID and Major and Minor Channel Numbers are modified within the stream .
Fail-Over and Fail-Back
Upon user's previous selection, the unit will automatically change its imput selection for Fail-Over (primary to secondary mode) or Fail-Back (secondary to primary mode.)
Alarms and Notifications sent via Email and IM
In the event of failure, the unit will send a notification to the user's email and text message the user's cell phone with the same notification.
All settings and controls can be viewed and set using a web-based GUI or Front Panel Control.