RCE Model 2020

1. DSP Digital Signal Products, Inc. Radio Controlled Equipment RCE Model 2020 Distinguishing Features • Uses 2 Texas Instruments TMS320C5410A • DSPs running @ 160 MIPS each • These DSPs employs a high degree of • parallelism and enhanced Harvard architecture • for increased performance • Executes most of the instructions in single • clock cycle • Superior all digital design approach • employing speech encoding @ 8KBit/s. • Digitization scheme embeds control data with • voice in 24.0 Kbit/s data stream, thus • providing high degree of data reliability • End-to-end voice bandwidth of 300-3000 Hz • All digital scheme does not need band-pass • filters to isolate voice and FSK data, as done • in classical analog/FSK modem designs • Push-to-talk throughput time (RCE-to-RCE • over unconditioned telephone lines) is • 40 msec without sacrificing any audio • bandwidth • Provides superior operation by eliminating PTT • and transmit voice skews. • All Input/Output (I/O) signal connections are • made through standard 25-pair telephone • type connectors, used widely in communication • systems • 16 BIT CRC insures data integrity. • Up to 5 controls (PTT M, PTT S, TX M/S, • RX M/S, Sq. Break) for each radio frequency, • with confirmation signals • Three modes of operation (Backup, Dual • Control Sites w/Priority or Dual Remote Sites) Provides full duplex voice and data communications between a control site and a remote site Provides paired frequencies (VHF and UHF) or independent 2 channel operation, reducing system cost by half. Provides an interface between Voice Switching System and remotely located radio transmitters and receivers Provides Speech plus Data Modem for operation over unconditioned telephone lines and satellite links Provides a high speed user serial data interface for trans-receiver tuning and other controls Provides status monitoring and health check of various assets located at remote sites Provides excellent unmatched voice quality

2. Overall Data Rate: 24.0 kBits/second (19.2 kBits/second in backup mode) User Data Rate: 600 Bits Per Second – Continuous with hardware flow control Voice-to-Data Isolation: 65 dB minimum Data Integrity: Parity Check, Checksum Validation, Positive Data Acknowledge, and 16 bit CRC Data: Digital Signal Products, Inc. Digital Signal Products, Inc. provides both high quality products for communication systems as well as services for developing solutions for specific customer problems. DSP Inc. can help establish requirements, provide both a high level design and a detailed design that satisfy a set of requirements and, if desired, actually build and test products that conform to the design. RCE Specifications Other Features 16 Analog/Digital (A/D) inputs at 10 VAC range for status monitoring of voltage levels at the remote site 16 Digital/Analog (D/A) outputs to receive and display test levels Built-in order wire capabilities for maintenance purposes Provides data scrambler for secure and error free operation over noisy telephone lines On card secondary lightning and transient protection for trunk line interfaces Built-in 1 KHz test tone generation and Loopback capability for fast fault isolation and recovery Front Panel Test jacks and LED’s for easy and quick fault isolation and equipment alignment Front Panel Dip-Switch settings for one/two channel operation and line level settings During single channel operation, controls for the second channel are available to the user Future enhancement includes remote unit firmware updates and configuration controls from the local site Specifications Voice Frequency Response (All Audio Interfaces): +/- 1 dB 300-3000 Hz with-respect-to 1 KHz Audio Line Levels: From –30 to +12 dBm Line Level Settings: Dip Switch/ or RS-232 Port Coupling: 1:1 Transformer for ground loop noise reduction Impedance: 600 Ohms +/- 5% AGC: +/- 12 dB DSP implementation Signal Routing: Main or Standby Radio Transmitters or Receivers Secondary Protection: Transient Line Protection and Lightning Protection Testability: Audio Loopback Digitization: 64 Kbits/second @ 8 KHz, u-law conversion Audio: PTT, Tx Main/Standby, Rx Main/Standby PTT Confirm, TX Main Confirm, Rx Main/Standby Confirm, Rx Mute, Squelch Break, Lockout Confirm Contact Closure, 500ma maximum current @ 48 VDC, or Ground when Active, 500ma maximum current @ 48 VDC, or 12/24 VDC when Active, 500ma maximum current @ 48 VDC contact protection RC network for spark suppression and contact protection MOV transient suppressor for enhanced contact life Radio Controls: (Outputs) Contact Closure, 5ma maximum current @ 12 VDC Ground when Active, 5ma maximum current @ 12 VDC Reverse polarity option with jumper strap selection Series current limiting for enhancing contact life RC network for contact debounce and noise filter Diode limiting for input transient protection Confirm Signals: (Inputs) Installation The DSP Inc. RCE chassis occupies on 1.75 inch (1 unit) rack space in a 19 or 23 inch wide rack Low Power requirements allows it to run with convection cooling Economical, external power supply option available The I/O design allows for a variety of interfaces with built-in options, uses standard telephone type Amp-Champ connectors for I/Os No daughter or mezzanine boards are required, so there are no add on hidden costs Other Related Products Voice Clipping –In some communication switches, there are call types where a caller will start speaking before the connection to the receiving position is complete. The Audio Clipping ASP prevents the loss of the initial portions of an incoming call when the connection times within the switch are too slow. The Audio Clipping ASP can store one second of the message. Tone Notching and Automatic Gain Control (AGC) –Air Traffic Controllers have identified two significant problems in many current voice switches: high frequency tones accidentally induced into their headsets, and improper balancing of volume of incoming calls. DSP has developed an Audio Signal Processor (ASP) that can remove two extraneous tones simultaneously in less than 70 msec without degrading the quality of the incoming signal. The same ASP also adjusts all incoming calls to a volume that is selected by the air traffic controller. Best Signal Selection (BSS) –In some radio communication systems, there are more than one receiver for a given frequency. This occurs for reasons such as too great a distance or terrain interference with only one receiver. Under some circumstances, multiple receivers will have a signal that exceeds an audible threshold, but the strength and quality may be significantly different. The Best Signal Selection ASP monitors all receivers and within 70 msecs routes the call using the highest quality signal. 21400 Ridgetop Circle, Suite 210, Dulles, VA 20166 Rev. A Jan, 03 Phone: (703) 654-7581 Fax: (703)654-7583 E-Mail: dsp@imcva.com