Comtech EF Data DMD-2050E Especificações descarregar pdf (Página 49)

DMD2050E Universal Satellite Modem Theory of Operation

MN-DMD2050E Revision 2 3–7

The Reed-Solomon Encoder, encodes the data into Reed-Solomon Blocks. The blocks are then

interleaved and synchronized to the frame pattern as defined by the selected specification (IESS-

308, IESS-309, DVB, etc.). After Reed-Solomon Encoding, the composite data and clock are

applied to the BB Loopback Circuit.

3.2.4 Rx Baseband Processing

The Receive Processor performs the inverse function of the Tx Processor. Data received from

the satellite passes through the BB Loopback Circuit to the Reed-Solomon Decoder to the

Deframer. The Deframer acquires the IBS/IDR/DVB frame, synchronizes the Reed-Solomon

Decoder and extracts the received data and overhead from the frame structure, placing the data

into the PD Buffer, sending the overhead data to the UIM. In Closed-Net Mode, the data is

extracted from the buffer and is sent to the UIM. Backward Alarm indications are sent to the M&C

Subsystem. In Drop and Insert Mode, the Insert Processor synchronizes to the incoming

terrestrial T1/E1 Data Stream, extracts satellite channels from the PD Buffer, and then inserts

them into the desired terrestrial time slots in the T1/E1 Data Stream.

3.2.5 Monitor & Control (M&C) Subsystem

The modems M&C system is connected to most of the circuitry on any board contained in the

modem. These connections provide status on the working condition of the circuitry as well as

providing the data required for the various measurements the modem provides. The M&C

processes this information and generates status indications as well as alarms when necessary.

Detailed status information is available via the modems various user interfaces including the

remote and terminal ports. An external summary fault is available on the RS422 Data interface

The M&C contains a high-performance microprocessor and is responsible for overall command

and control of modem functions. The M&C is constantly monitoring all subsystems of the modem

by performing a periodic poll routine and configures the modem by responding to commands

input to the system. During each poll cycle, the status of each of the subsystems is collected and

reported to each of the external ports. Performance statistics such as Eb/No, buffer fill %, etc.

are compiled. If faults are detected, the M&C will take appropriate actions to minimize the effect

of such faults on the system (refer to the Fault Matrices in Chapter 6).

The modem supports the following M&C protocols:

• Terminal Interface (Section 3.2.6)

• Remote Port Interface (Section 3.2.7)

• Ethernet M&C, Web Browser & SNMP (Section 3.2.8)

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Comtech EF Data DMD-2050E Especificações Página 49