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User Interfaces DMD15/DMD15L IBS/IDR Satellite Modem
4-8 TM051 – Rev. 5.8
4.3.3 Demodulator Menu Options and Parameters
Mode
: {IDR, IBS, Closed Net, Drop & Insert}
Used with IDR, or IBS Interface Only.
The Mode Command sets a number of parameters
within the modem to meet a set specification. The
purpose is to eliminate keystrokes and potential
compatibility problems. Additionally, data rates not
covered by the given mode of operation will not be
allowed. If the mode of operation is selected after the
data rate has been entered, then the data rate must be
compatible with the desired mode of operation or the
mode will not be allowed. The following parameters are
set for the given mode of operation and cannot be
changed while the unit is in the given mode of operation:
IDR Mode:
(IESS-308)
For Data rates 1.544, 2.048, 6.312, 8.448 Mbps
Framing Type: 96 Kbps (IDR)
Descrambler type: V.35
Spectrum Mask: Intelsat
For Data Rates < 1.544 Mbps
Framing Type: 1/15 (IBS)
Descrambler Type: IESS-309
Spectrum Mask: Intelsat
IBS Mode:
(IESS-309)
For Data Rates <
2.048 Mbps
Framing Type: 1/15 (IBS)
Descrambler Type: IESS-309
Spectrum Mask: Intelsat
Closed Net:
All possible combinations allowed
Drop & Insert:
Data Rates: n x 64, n = 1, 2, 3, 4, 5, 6, 8, 10,
12, 15, 16, 20, 24, 30
Framing Type: 1/15 (IBS)
Descrambler Type: IESS-309
Spectrum Mask: Intelsat
Strap Code:
{Refer to Strap Code Guide, Section 4.3, Table 4-4}
The Strap Code is a quick set key that sets many
modem parameters. Consult the strap code guide for
available strap codes. Parameters set by strap code:
Data Rate
Code Rate
Mode
Frame Type
Scrambler Type
Spectrum Mask