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Paradyne operation manual Periodic Maintenance, Troubleshooting, DMD15/DMD15L Fault Philosophy

Models: DMD15 DMD15L

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DMD15/DMD15L/DMD15/DMD15LL/DMD15/DMD15LIBS/IDR Satellite Modem

Maintenance

 

 

Section 6 – Maintenance

6.0 Periodic Maintenance

The DMD15/DMD15L modulator requires no periodic field maintenance procedures. Should a unit be suspected of a defect in field operations after all interface signals are verified, the correct procedure is to replace the unit with another known working DMD15/DMD15L. If this does not cure the problem, wiring or power should be suspect.

There is no external fuse on the DMD15/DMD15L. The fuse is located on the power supply assembly inside the case, and replacement is not intended in the field.

6.1 Troubleshooting

The following is a brief list of possible problems that could be caused by failures of the modem or by improper setup and configuration for the type of service. The list is arranged by possible symptoms exhibited by the modem.

Symptom: The Modem will not acquire the incoming carrier:

Possible Cause: Improper receive input to modem.

Action: Check that the receive cabling is correct.

Possible Cause: Receive carrier level too low.

Action: Check that the receive cabling is correct, that the downconverter is properly set and that the LNA is turned on. If a spectrum analyzer is available, locate and measure the receive level, which should not be below -65 dBm absolute, -50 dBm is nominal.

Possible Cause: Receive carrier frequency outside of acquisition range.

Action: Check that the receive acquisition range is adequate for the possible system offsets. Setting the value to 30 kHz is a standard value encompassing all normal offsets. After acquisition, the actual receive frequency can be read from the Front Panel.

Possible Cause: Transmit carrier incompatible.

Action: Check the receive parameter settings and ensure that they match those on the modulator.

Possible Cause: Modem is in Test Mode.

Action: Check the modem Front Panel for yellow warning LEDs indicating a Test Mode is enabled. Self-Test or IF Loopback disconnects the Demodulator from the IF receive input connector.

Symptom: The Async Port is not configured correctly.

Action: Refer to Section 5.8 to correctly set switches for correct configuration.

6.2 DMD15/DMD15L Fault Philosophy

The DMD15/DMD15L performs a high degree of self-monitoring and fault isolation. The alarms are separated into three categories; Active Alarms, Common Equipment Alarms, and Latched Alarms. In addition, a feature exists that allows the user to ‘Mask’ out certain Alarms as explained below. Alarms that are recorded in the event buffer are the same as the alarm buffer.

TM051 - Rev. 5.8

6-1

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Page 168
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Paradyne operation manual Periodic Maintenance, Troubleshooting, DMD15/DMD15L Fault Philosophy
Page 167 Page 169

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.