Data Time Slots
These are the time slots during which users
transmit or receive data. There are three segments of
time slots in each frame, designated A, B, and C.
Segment A may contain from one to five circuits; B
may contain from one to eleven circuits; and C may
contain from one to six circuits. The number of circuits
in each group depends on the baseband data rate, the
forward correction rate, and the transmission burst
rate, as influenced by the radio frequency interference
For communications on the eastern Pacific
satellite, a master control station is installed at
NCTAMS EASTPAC. This same pattern of DAMA
equipment installations has been followed at
NCTAMS LANT, MED, WESTPAC, and NTCS.
Each master control station has multiple multiplexer
installed, and each TD-1271B/U multiplexer can
accommodate up to four circuits. The number of
multiplexer installed aboard each ship varies
according to platform requirements.
Any DAMA-equipped platform with full-duplex
capability can be designated a channel controller. This
capability provides an emergency backup for the
shorebased master controller terminals. A DAMA
subscriber who is designated a channel controller will
provide all the required CCOW functions for DAMA
system control of a particular rf channel.
Operationally, the user terminal will have its
baseband port automatically connected to a data time
slot when the proper slot number is keyed into the
multiplexer front panel keyboard. Each SATCOM
subsystem that uses DAMA will have a specific slot
number. Circuits will normally be operated on a netted
basis, and circuit numbers will be assigned by
COMNAVTELCOM and/or FLTCINC.
Transition to DAMA is taking place in a manner
that allows subscribers converted to DAMA to
communicate with those who have not been converted.
During the transition period, equipment installed
at shorebased master stations will form gateways
between DAMA and non-DAMA circuits. In the
following paragraphs, we will discuss subsystems that
are either currently undergoing conversion to DAMA
or are planned for conversion, so you will know what to
expect in the future.
Secure Voice DAMA is now being phased into
the Secure Voice Subsystem. A DAMA-configured
Secure Voice Subsystem is shown in figure 3-12.
CUDIXS/NAVMACS NAVMACS platforms
will be gradually transitioned to DAMA. This
transition will start when CUDIXS shore and
CUDIXS/NAVMACS ship hardware and software
have been modified for compatibility with DAMA. At
that time, a transition will begin allowing DAMA or
non-DAMA ships to communicate with the CUDIXS
shore terminal. A DAMA-configured CUDIXS/
NAVMACS subsystem is shown in figure 3-13.
DAMA becomes available as DAMA is installed on
each platform. To provide maximum flexibility during
the transition, capability is provided at the shorebased
master control stations to interface non-DAMA and
DAMA users. Figure 3-14 shows a DAMA-configured
The Control Subsystem is structured to perform
the following tasks:
Sense and collect system status information in a
defined geographical area and on a worldwide
Control system resources and the degradation
of system capability.
The Control Subsystem is a combination of several
areas and levels of command. The major players are
The Chief of Naval Operations is the executive
authority for all SATCOM system.
The Commander, Naval Space Command is
responsible for the operational control and management
of these systems and for the effective operation and
maintenance of assigned Navy resources for the
Department of Defense.
The Naval Computer and Telecommunications
Command performs the required functions to pro-
vide day-to-day control and operation of naval satellite
communications assets. With coordination, system
resources can be adjusted to meet operational needs.