DekTec DTE-3114 User Manual
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DTE-3114 – Networked Quad QAM ModulatorUSER MANUAL41. Introduction1.1 General descriptionThe DTE-3114 is a compact four-channel QAM modulator with Transport Stream over IP (TSoIP)inputs and a directly synthesized VHF/UHF output. The device can operate in DVB-C, J.83 Annex Band J.83 Annex C mode, with support for the various QAM constellations and interleaver modes.The unit accepts unicast and multicast streams over its Gigabit-Ethernet port, and modulates the fourTSoIP streams to four adjacent channels anywhere between 32 and 1006MHz. Key features includede-encapsulation of UDP or RTP, accurate timing reconstruction using innovative algorithms toovercome IP jitter, as well as error correction according to SMPTE 2022-1.A significant innovation in the DTE-3114 is support for Power over Ethernet (PoE). When used with aPoE compatible network, the modulator does not require a separate power feed, as it can draw itspower from the Ethernet network. A power jack is still offered where PoE is not available.The DTE-3114 supports SNMP management and has an easy-to-use web-based user interface forconfiguration purposes, as well as retrieving status information and performance statistics. The LCDstatus display shows the user-programmable device identifier, current configuration information andIP/MAC address.1.2 Block diagramFigure 1 shows the functional block diagram of the DTE-3114. Each of the four channels starts withan IP filter that selects IP packets for the configured unicast or multicast address. The resulting IPpackets are converted to a Transport Stream, which will typically be a Multi-Program TransportStream (MPTS). In this block any lost packets are recovered in the FEC decoder and the input TS rateis accurately estimated. Buffering with a configurable delay is included to be able to tolerate IP jitter.Figure 1. Functional block diagram of the DTE-3114.After reconstructing the Transport Stream its rate is converted to the rate corresponding to themodulation settings (QAM constellation, symbol rate). Rate conversion comprises inserting nullpackets and adjusting the PCR time stamps. Then the packets are QAM modulated according to the |
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