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The GDP Space Systems Model 236 PCM/PAM Simulator addresses the need to perform cost effective PCM or PAM clock and data simulations. The unit facilitates the simulation of PCM by combining the most desired application features into one unit. The Model 236 is ideal for PCM users who do not have the time or the inclination to become simulator programmers. The Model 236 allows users to directly describe a telemetry format in response to plain language prompts using the front panel keyboard and high-contrast vacuum fluorescent display or the remote Virtual Interface Software.
Features
1 Bps to 40 Mbps with 1 Hz resolution Internal Frequency Synthesizer Frame and Subframe capacity Bipolar output option Virtual Instrument Software for remote control All IRIG PCM Codes and RNRZ-LSelectable RNRZ-L patterns, forward and reverse (2 N -1; N=7, 9, 11, 15, 17, 20, 23)	Convolutional Encoder (R=1/2, K=7) Local and Remote Control Non-Volatile Format Storage 8192 unique frame data words 8192 unique subframe data words Dynamic data changes during simulation TTL, RS-422 and RS-232 outputs
The PCM simulation format consists of a frame filled with a background pattern over which unique data words may be superimposed. A subframe may also be added to the format and unique words placed anywhere within the frame/subframe matrix. The unique words may also be distributed throughout the frame and/or subframes in a super commutated structure. The Model 236 generates PCM data at rates up to 40 Mbps. Output data rate is determined by an external clock source, or by the internal frequency synthesizer. The internal synthesizer may be programmed for the desired data rate by direct entry from the front panel or via the Remote Control interface. The Remote Control interface can be used for all format, data rate and code selections. The GDP Virtual Interface Software simplifies and enhances the programming process.
Applications Data Processing System Test: The flexibility and performance of the Model 236 PCM/PAM simulator make it an excellent simulation tool for evaluating and testing PCM Data Reduction and Processing Systems. A unique, table driven architecture enables the user to specify complex PCM formats and unique data values on a word-by-word and frame-by-frame basis. The Model 236 generates all of the standard IRIG STD PCM codes (NRZ-L/M/S,RNRZ, BiØ-L/M/S, and DM-M/S). The data output may also be convolutionally encoded. The user can test the performance of a processing system under known conditions with fixed or varying data values. Satellite Receive Station Test: The Model 236 is capable of generating complex PCM formats similar to those produced by many of the remote sensing satellites, and the TT&C links on various communications satellites. Using a data stream produced by the Model 236 "GO/NO GO" quick-tests of a receive station and ground station maintenance and troubleshooting may be supported. The Model 236 PCM/PAM simulator is compatible with practically all of standard modulators and up converters. Therefore, it should be capable of supporting end-to-end (antenna to computer) testing of a receive station. Systems Integration Support: Local operation via the front panel display and keyboard, and Remote operation via RS232 or optionally IEEE-488, enable the Model 236 PCM/PAM simulator to support the systems designer through all phases of systems integration. Supporting hardware component test to operational software evaluation, the Model 236 can supply a "known" source of PCM or PAM data that can assist the integrator performing tests beginning at the subsystem level and progressing through the operation of the entire system.