The LEX-2000 unit is integrated and very flexible. It can be configured to accommodate many different encoding needs. Standard encoder configurations include 4xSD 1HD + 3xSD 6xSD or 8xSD programs. CMX units may be upgraded with a license file to add channels or optional features as the station’s needs grow or change.
The LEX-2000 incorporates powerful video processing The unit has the ability to receive digital and/ or analog video and encode into ATSC compliant SD and/or HD streams. The video encoder supports multiple frame rates, GOP sizes, and aspect ratio controls, allowing the broadcaster to setup the encoder to match the program content and viewer preferences. The built-in statistical multiplexer adjusts the effective bit rate of each video encoder channel to optimize output bandwidth utilization.
The LEX-2000 includes a built-in multiplexer to create the final output 19.39 Mbps transport stream for OTA broadcast or 38.8 Mbps transport stream for cable broadcast.
The LEX-2000 supports multiple methods of receiving program guide and dynamic PSIP data including a manual low-cost PSIP solution for small broadcasters as well as more comprehensive, automated solutions for larger broadcast enterprises. The unit supports reception of external dynamic PSIP data from most of the popular third party PSIP generators through the built-in IP data input. Optionally, the LEX- 2000 supports automatic guide data ingest from sources such as TMS, BIM or on-site traffic systems using the PMCP XML file format.
The CMX-EPG software, provided free of charge with the LEX-2000, allows the LPTV operator to build a customized program guide using a simple spreadsheet imported into the unit typically on a weekly basis.
The LEX-2000 supports ATSC mandatory closed captioning. If the source video input contains CEA-608 closed captions (CDP’s, ANC, or Line 21), the unit extracts the data and inserts it into the output video stream. CEA-708 captions are passed from the input video into the transport multiplex and placed in proper location for 708 captions.
The optional 67 closed caption translator receives 608 captions from the video input signal and creates full 708 captions based on the 608 caption content. 708 caption colors fonts and presentation modes are selectable for each channel.
The rear panel of the LEX-2000 has a DVI connection that can be connected directly to a PC monitor or with a DVI-to- HDMI converter to an appropriate television monitor.
The monitoring port provides at-aglance status of each of the video encoded programs (thumbnail) as well as the operational status information for each service in the multiplex.
The LEX-2000 provides a video cutover switch for EAS applications. EAS can be triggered by a contact closure or audio tones. EAS audio tones and EAS program sources may be provided on different signal inputs than the main audio and video program inputs The broadcaster can select which of their broadcast services are switched over to the EAS programming when activated.
The LEX-2000 manages the Active Format Description (AFD). AFD values received with the input video are passed to the output For input video that does not have AFD data, the LEX- 2000 allows the broadcaster to define a default aspect ratio independently for each of the SD and HD video formats so that the proper AFD value may be inserted into the encoded video stream of the output multiplex.
The LEX-2000 can be optionally equipped with an ASI input for precompressed programs from a satellite IRD or similar device The LEX-2000 has the ability to re-multiplex program streams from the ASI input into the unit’s final transport stream output, creating a mix of national content with locally encoded programs.
The LEX-2000 can be equipped with the TG option for streaming IP output and SMPTE-2022 FEC. This feature enables the CMX unit to transmit the final ATSC multiplex as a User Datagram Protocol (UDP) or Real Time Protocol (RTP) data stream over Ethernet with the data rate selectable from 10 to 80 Mbit/sec.
SMPTE-2022 FEC is included to protect against packet loss in unmanaged IP networks. The TG option also enables the ASI input to be converted to an IP output, allowing the CMX unit to loop through Neilson units and generate a final IP output to a Studio to Transmitter Link (STL).
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