MPM-1000A Operator Manual
1000-7075 Rev E
8-1
8
NETWORK CONTROL OPERATIONS
8.1 Network Overview
The Modem is an IP-based Modem that implements the NCW specified by MIL-STD-
188-EEE. An NCW network is a full-mesh SATCOM network designed to support a
group of terminals with varying antenna, power and overall transceiver characteristics
–
ranging from large-aperture strategic terminals to small-aperture tactical terminals. The
Ruggedized Modem provides the capability to implement the NCW using a single beam
configuration or an advanced multi-beam with cross-banding and differentiated gain
states configuration as is found in the Wideband Global Satellite (WGS).
MIL-STD-188-EEE defines a full-mesh demand assigned multiple access (DAMA), MF-
TDMA waveform. It defines IP over satellite networking designed to meet requirements
for performance and functionality in strategic and tactical/mobile environments. An
automatic multi-frequency TDMA scheduler maximizes network data-throughput and
utilization of the allotted satellite bandwidth and power at the transponder, along with
providing automatic power control. Differentiated Services IP Quality of Service (QoS) is
applied to user data for priority, service classification and traffic shaping. Single-hop
connectivity and burst scheduling designed to reduce latency and latency deviation
(jitter) results in high quality Voice over IP (VoIP) and video service.
The Modem incorporates FPGA technology capable of supporting advanced Modem
digital signal processing, including multi-channel high-order modulation/demodulation,
Turbo Codec FEC and 256-bit AES encryption. It also provides burst-to-burst adaptive
coding and modulation.
All nodes in a network operate using a common network transmission security
(TRANSEC) key. Weekly key rollovers are the responsibility of and controlled by the
NC.
8.1.1 Network Controller and Network Members
The NC performs the network management, timing functions and dynamically allocates
Satellite resources to each NM in accordance with their data priority needs. The NC
performs these tasks at the rate of just over twice a second.
There is only one NC controlling the network at a time. Other NM terminals can be
configured as NCC and will operate as NMs until required to perform NC responsibilities
either because the primary NC has failed or a controlled handover was performed. The
NCC handover precedence listing is determined by the order in which terminals log in.
Figure 8-1 Basic Network Architecture illustrates the basic architecture of an NCW
network, consisting of a NC and one or more NMs. The NC is the point of control to
establish both network signaling and traffic communications between two (2) or more
nodes, where a node may be the NC or an NM. Signaling is implemented through
