Operational Features - Comtech EF Data SLM-5650A Installation And Operation Manual

SLM-5650A Satellite Modem
Introduction
1.3.3

Operational Features

1.3.3.1 Operating Modes
The SLM-5650A supports Closed Network, Open Network and OM-73 modes of operation.
1.3.3.1.1 Closed Networks
Closed Networks refer to private networks with modem operational parameters that do not need to
interoperate with modems developed for commercial open networks (as specified under IAW
IESS-308, IESS-309, and IESS-310 requirements for open network operation).
A Comtech EF Data overhead channel is provided so that the modem is capable of operating in
such closed networks over commercial satellites IAW Intelsat requirements for use during closed
network operation.
1.3.3.1.2 Open Networks (Intelsat)
Open Networks refer to networks that must meet Intelsat specifications for Effective Isotropic
Radiated Power (EIRP), EIRP stability, spurious emissions, intermodulation products, adjacent
carrier interference, frequency tolerance, equalization, and modem parameters such as
modulation, FEC, and scrambling.
The SLM-5650A meets Intelsat certification requirements and is capable of operating in such
open networks over commercial satellites (as specified under IAW IESS-308, IESS-309, and
IESS-310 requirements for open network operation).
The modem supports the overhead framing integral to those modems, in order to be fully
compatible with commercial modems complying with IAW IESS-308, IESS-309, and IESS-310.
No access is provided to the overhead channel data or alarms.
1.3.3.1.3 OM-73 Mode
OM-73 Mode allows the SLM-5650A to be compatible with Linkabit's original OM-73 modem.
This modem and its operational capabilities have become a de facto standard when operating over
DSCS satellites. All OM-73 modes listed in MIL-STD-188-165A are supported.
1.3.3.2 Secure Management Interfaces
The SLM-5650A supports secure management interfaces, as part of its Management Security
option, when the optional Network Processor (NP) Interface Module and/or the TRANSEC
Encryption card are installed either individually or in tandem.
When Management Security is enabled, three important modes of operation affect network
management functionality:
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