Comtech-ef-data SDM-300A Instrukcja Użytkownika Pobierz pdf (Strona 215)

SDM-300A Satellite Modem Revision 6

Modem Types MN/SDM300A.IOM

6-7

Table 6-7. Comtech EFD Closed Network Parameter Settings

Parameter Front Panel Setting Reference Menu

Modem Type EFD Utility: Modem Type

TX Data/Code Rate TX-V, QPSK 1/2 Configuration: Modulator

TX-IF Output ON Configuration: Modulator

RX Data/Code Rate RX-V, QPSK 1/2 Configuration: Demodulator

TX Clock Source TX Terrestrial Configuration: Interface

Buffer Clock Source Satellite Clock Configuration: Interface

Modulator Type EFD Closed (All modulator types

are accessible)

Utility: Modulator

Encoder Type Viterbi or Sequential Utility: Modulator

Demodulator type EFD Closed (All modulator types

are accessible)

Utility: Demodulator

Decoder Type Viterbi or Sequential Utility: Demodulator

TX Overhead Type None Utility: Interface

RX Overhead Type None Utility: Interface

Interface Type EIA-422, EIA-232, V.35, G.703 (see

Note)

Utility: Interface

Buffer Program Bits or Milliseconds Utility: Interface

RTS TX-IF Cntrl OFF or ON Utility: Interface

CTS Delay 0 Seconds Utility: Interface

Note: To use G.703, the modem must have the required G.703 Overhead board (PL/5305-1)

installed.

6.1.6 Custom Operation

Note: If the modem serves as the backup unit for a rack of modems having different

hardware and FAST options, then the backup modem shall have all of the features and

hardware found in the other modems.

Operating in Custom mode allows access to all front panels menus, including the Utility

menus. The Custom operation mode is manly used when the modem must function with

no overhead in an open network application. For example, to use the modem in the IDR

mode of operation with overhead (308-2), the following steps are taken:

1. Select the IDR modem type, so that the modem loads the IDR default parameter.

2. Select the Custom modem type, which allows Access to the modulator and

demodulator overhead type.

3. Select NONE for the overhead types.

A protection switch can make use of the Custom operation mode when the modem is

configured as a backup modem. Because the backup modem is operating in Custom

Mode, the switch can program all the backup modem parameters. Thus, the one backup

modem can be made compatible with all of the various application types found in the

rack.

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