Rockwell Collins’ MDM-2X02N is an advanced tactical data link modem which combines all functionalities required for a Link 11 Data Terminal Set (DTS) and for a Link 22 Signal Processor Controller (SPC) into a single product. TheMDM-2X02N can be provided as simple L11 DTS, single or dual-channel L22 SPC or L11/L22 modems.

The MDM-2X02N data link modem family offers three equipment versions specifically designed for airborne, ground and ship borne applications.

The MDM-2X02N product line family includes:

• MDM-2402N: a VME type card set
• MDM-2002N: a 19" standard rack
• MDM-2202N: a 1/4 ATR standard chassis

All versions can be upgraded with L22 or L11 modem functions by loading SW.

Depending on the configuration, several functionalities are possible. One MDM-2X02N allows:

• Simultaneous handling of two links among the four Link 22 HF-FF, HF-EPM, UHF-FF, and UHF-EPM channels
• Simultaneous handling of one link among the four Link 22 HF-FF, HF-EPM, UHF-FF, and UHF-EPM channels and one link among the two Link 11 HF-FF, UHF-FF channels.

These configurations can be set up via the front panel or via the remote control interface.

Link 22 SPC

The MDM-2X02N implements the Link 22 Signal Processor Controller (SPC) functions. When configured as a full SPC, the MDM-2X02N can manage two L22 channels. For a full Link 22 configuration, two MDM-2X02 units will operate simultaneously on the four channels. Its front panel as well as its remote control interface, provide data on Link22 network status, errors detected.

Platforms operating on two Link 22 channels will only require one MDM-2X02N unit.

Link 11 DTS

• Operational applications
  • Station modes Net Control Station (NCS) or
  • Participating Unit (PU) per MIL-STD-188-203-1A
• Operational modes
  • Roll call
  • Short Broadcast
  • Long Broadcast
  • Net Test
  • Net Synchronization
  • Radio Silence per MIL-STD-188-203-1A
• Modem waveforms
  • CLEW (Conventional Link Eleven Waveform) per MIL-STD-188-203-1A
  • Doppler frequency shift correction: +75Hz, tracking at 3.5Hz/sec on 605Hz pilot tone
  • Independent sideband operation (diversity)
  • SLEW (Single-tone Link Eleven Waveform) per SPAWAR-S-850 dated 10 February 1992
• SATCOM L11 Interface
  • In addition to the audio interface to the HF or UHF radios, the MDM-2x02N offers and RS-232 interface to exchange Link 11 over a SATCOM network
• Dual Link 11 capability
  • The MDM-2x02N supports network management and data transmission over one Link 11 network using simultaneous operation

Local/Remote Control Interface

The MDM-2X02N may be controlled either locally from the front panel or remotely (RS-232 compatible) via its control interface. Control software for Windows® 2000/NT operating system PC compatible computers is available.

Link 11 Split Site Capability

To support Link 11 installations where the Tactical Data System (TDS) computer and the radio equipment are located at separate sites, the MDM-2002N has a split site interface and supporting features. One MDM-2002N is to be installed on each site and interconnected by a digital link which may be used to pass tactical data and control information between both MDM-2002N units.

Comprehensive Built-In-Test

Modem operation and maintenance are enhanced by built-in automatic performance monitoring and fault isolation circuits. When primary power is first applied, a self-test is automatically initiated to verify operational status of the modem. During operation, the processors continue to perform background diagnostics. Self-test can also be initiated via the local/remote control interface. Detected faults are identified at the front panel and in subsequent status messages output at the control interface.

The interface towards the crypto module can be either NTDS (MDM-2002N or MDM-2402N), or ATDS.

In addition to the audio interface to the HF or UHF radios, the MDM-2X02N offers an RS-232 interface to exchange Link 11 over a SATCOM network.

The MDM-2X02N supports network management and data transmission over one Link 11 network using simultaneous operation.

Link 11 kits are also available for all L22 modems.

The TBMDM-2X02 test set is dedicated to the MDM-2X02N modem maintenance. It enables the connection with the following modem versions:

• MDM-2402N ATDS and NTDS: VME version,
• MDM-2002N ATDS and NTDS: rack 19 with control panel,
• MDM-2202N Aiborne version (cylindric connectors).

The test procedure consists in activating an MDM-2X02N integrated test either with an external "strap" (for the MDM-2402N version) or a "dip switches" configuration (for the MDM-2202N version). Error detection for board failure is correlated with the total number of impulses received matching a dedicated code. Additional testing is done to determine both audio (power supply and form) and ATDS (power supply and pulse bandwidth) signal features.