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SLM-3650 Satellite Modem
Introduction
1.1.2
Modes of Operation
The following main modes of operation are supported:
ASYNC Overhead Interface with AUPC
Custom
Drop & Insert (D&I)
EFD Closed Network
IDR
IBS
CDM Modem
The ASYNC/AUPC option allows for an additional overhead channel to be multiplexed
and demultiplexed from the data carrier.
The Custom mode of operation enables the programming of the modem for emulating
most proprietary modems.
Two mechanisms are provided for uplink power control within a closed network. One
method, which requires the optional ASYNC/AUPC interface card, is used for control
between two links to sustain sufficient transmit power to maintain a programmed E
both ends.
The second method is used for self-monitoring the carrier from the same uplink with the
local demodulator, requires no additional hardware, and is software-selectable. This
method is appropriate for applications such as paging networks, where the uplink is
transmitting to receive-only devices. The self-monitoring AUPC function is not available
when the ASYNC/AUPC interface option is installed.
The modem interfaces between the channel unit or multiplexer (MUX) and Intermediate
Frequency (IF) converter equipment operating in a 50 to 180 MHz band. An internal
channel unit, conforming to IESS-308, -309, -310, and –315 (Turbo only) emulation
specifications, provides overhead designated for an ESC.
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SDM-100 Emulation
SDM-650 Emulation
SDM-6000 Emulation
SDM-300 Emulation
SDM-308 Emulation
SDM-309 Emulation
1–3
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