The KTech DCC-150E is used for reception of an 8-VSB RF signal and 8-VSB remodulation to another CATV or VHF/UHF Channel. It demodulates an 8-VSB RF signal into baseband signals, updates the PSIP VCT's Station ID, Major and Minor Channel Numbers, remodulates the baseband signal into an 8-VSB 44.0 MHz I.F. signal, and upconverts the 44.0 MHz I.F. signal into an 8-VSB RF signal.
8-VSB RF Demodulation
The 8-VSB Demodulator demodulates a 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.
An 8-VSB RF, DVB-ASI or SMPTE-310M transport stream can be fed into the DCC-150E. These signals feed into interface decoders that output MPEG2 Transport Streams. Note: The DCC-150E can accept any DVB-ASI signal that has a rate less than or equal to 45 Mbps. If SMPTE-310M and DVB-ASI outputs are desired, the DVB-ASI Input should not exceed 45 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 web-based GUI.
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 and DVB-ASI outputs are desired, the DVB-ASI Input should not exceed 45 Mbps.
The 8-VSB Modulator modulates the Parallel MPEG2 Transport Stream into an 8-VSB 44.0 MHz I.F. signal.
The Upconverter takes a 44.0 MHz I.F. signal and converts it to a higher frequency. Its RF output is frequency agile in 12.5 KHz steps over a range of 55 MHz to 858 MHz. These frequencies cover both CATV and VHF/UHF bands.
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 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 input 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.