Operation

DMD15/DMD15L IBS/IDR Satellite Modem

 

 

3.9.4 Front Panel Interface

The M&C operates the Front Panel, which includes a 2 x 12 backlit LCD, Indicator LEDs, and a Numeric Keypad.

3.9.5 Clock

The time and date is kept in order to ‘time-tag’ system events.

3.9.6 Watchdog Timer

The Watchdog Timer monitors the health of the M&C Subsystem.

3.9.7 Program Flash ROM

The 512K of reprogrammable program ROM (expandable to 1 MB) is available to the M&C.

3.9.8 RAM

128K RAM (expandable to 512K)

3.9.9 Non-Volatile RAM

8K of Non-Volatile RAM (expandable to 32K) is provided in order to hold the modems current configuration. In the case of power interruption, the M&C will reconfigure the modem identically to the state before power was lost.

3.10 Universal Modem

The Universal Modem (UM) Card contains a complete variable rate modulator/demodulator intended for satellite communications. The UM utilizes the latest digital technology for high reliability and versatility. The modulator and demodulator sections may be configured independently under processor control. The UM includes a duaL-Band 70/140 MHz IF, QAM Modulator/Phase Lock Receiver, Convolutional Encoder/Viterbi Decoder, sequential decoding option, Differential Encoder/Decoder, and a V.35 Scrambler/Descrambler.

3.10.1 Modulator

Processed baseband data ready for transmission enters the modulator and undergoes, if the functions have been enabled, V.35 Scrambling and Differential Encoding. The data then undergoes convolutional encoding and is fed to the Dual Variable Interpolating FIR Filter. The FIR Filter shapes the data waveform to a predefined spectral mask and vectorizes the data for mapping into a PSK Constellation. The data is then converted to an analog waveform and is vector modulated onto an RF Carrier produced from the Transmit IF Synthesizer Circuitry. The final output is then fed to the IF Loopback Circuitry where under microprocessor control the Transmit Signal may be routed to the demodulator. Due to its nearly complete digital implementation, the modulator is capable of performing virtually any modulation format, and can produce almost any desired spectral mask. The modulator also houses the SCT and Reference Oscillators. The Reference Oscillator provides the frequency standard for both the modulator and demodulator. An external reference may also be selected. In this case, the Reference Oscillator is locked to the external reference.

3-10

TM051 – Rev. 5.8

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Paradyne DMD15 Front Panel Interface, Clock, Watchdog Timer, Program Flash ROM, 8 RAM, Non-Volatile RAM, Universal Modem
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DMD15, DMD15L specifications

The Paradyne DMD15L and DMD15 are advanced digital modems designed to enhance communication in a variety of networking environments. As part of Paradyne's robust portfolio of networking solutions, these devices are engineered to deliver reliable and efficient data transmission over both copper and fiber optic connections.

One of the main features of the DMD15L and DMD15 is their capability to support Multiple Protocol Data Units (MPDUs), which enables them to handle a diverse range of network protocols seamlessly. This flexibility makes them suitable for different applications, from industrial automation to telecommunications.

These modems utilize advanced modulation techniques, such as Quadrature Amplitude Modulation (QAM), to maximize data throughput while maintaining signal integrity. This ensures that users benefit from high-speed connections, even in challenging signal environments. Furthermore, the DMD15 series incorporates Error Correction Codes (ECC) that enhance data reliability, effectively reducing packet loss and ensuring data coherence during transmission.

The DMD15L is particularly notable for its long-range capabilities, making it a go-to solution for users requiring extended distances without compromising data quality. It features built-in Adaptive Equalization, which automatically adjusts signal levels to optimize performance over varying transmission distances. This technology is crucial in maintaining consistent high-speed connectivity, especially in environments with variable conditions.

Both models are equipped with user-friendly interfaces that facilitate configuration and management. They support SNMP (Simple Network Management Protocol) for real-time network monitoring, allowing administrators to track performance metrics and identify potential issues before they impact users. The devices also include LED indicators for quick status checks, ensuring that users have immediate visibility of operational conditions.

In terms of physical characteristics, the DMD15 and DMD15L are designed for durability and ease of installation. They come in a compact form factor, making them suitable for deployment in constrained spaces. Additionally, their robust casing is built to withstand harsh environmental conditions, making them suitable for both indoor and outdoor installations.

Overall, the Paradyne DMD15L and DMD15 are high-performance modems that combine versatile technologies, reliability, and user-friendly features. They are excellent choices for organizations looking to enhance their communication capabilities and ensure robust data transmission across diverse networks. With their advanced functionalities and adaptability, these modems stand out as key components in modern network infrastructure.
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