-->[OO]::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
-->]OO[:[ ACTS-Satelites ]:::::::[OO--[ by lowtek ]--[ lowtek@l0wtek.org ]:::
-->[OO]:::::::::::::::::::::::::::::::[ http://deadprotocol.org/lowtek ]:::::
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|The World of the Advanced Communications Technology Satellite... |
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ACTS-Operations and structure
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written by lowtek
lowtek@deadprotocol.org
lowtek@l0tek.org
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Advanced Communications Technology Satellite
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The ACTS satellite network was depelopted and schedualed for launch on
Febuary 3, 1993 It is located in the Ka band at around 18-31 ghz and is in
geosynchronous orbit aka the clark belt (22,300 miles above earth.) The ACTS
satellite has many features that are not yet avalible to the public satellite
market and shall continue to lead major satellite research towards it. This
satellite was a result of the research done by many military and government
operations that wanted to work on specific satellite projects to lead the
public satellite verndors. They work on specific projects such as mobilie
terminals, ATM linking via satellite, SOnet, and many other large network
communications useage.
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Features of ACTS:
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.o 110-Mbps time division Multiple Access
.o Digital regeneration and Switching on board the satellite
.o Multi Beam Anteana's
.o BaseBand Processor
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There are currently many earth station
developments going on in means of the
ACTS satellite such as the following:
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| The ACTS T1 VSAT|
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Is basically The main earth Station that provides means with communicating
with the satellite and most of its functions on board.
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| The ACTS Mobile Terminal|
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Is away of achieving the goal of making tremendous speeds of satellite data
well on the road and making it easier to communicate world wide. This earth
station will be put into use with things such as International Hostpitals and
also Telemedicine, Quality Audio, Military, Secure Communications and Many
Aeronautical Applications such as Jets, Missiles and other aero mobile units.
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|The Aeronaticaul Experiment|
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This Station is similar to the Mobile Station in that it is on the run but
in a different platform of the word run. Here we are talking about in the
midst of soaring 5000 miles high and transmitting a signal to the satellite
for navigation, radar, enemy persuit.
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|ACTS MASCOM|
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Is a Station that would let you manipulate the steering of a vehical in
persue this was tested at Fort Leavenworth with a Hummer to test the
Electronic Steering.
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|Broad Band Aeronatical Terminal|
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The Broad Band terminal allows the satellite to upink many things at the same
time such as 2 conversations on the telephone and compressed 2 way video also
full resolution of Television to the air craft.
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|INTEX Ka Band Experimental Satellite Ground Terminal|
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This station is mainly one to help out with all of ACTS other experiments it
provides measurement of various signal quality on the satellite link quality.
Also is used to evaluate data compresion and Compares digital modulation and
coding data.
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|HBR/LET|
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High Burst Rate Link Evaluation Terminal is used as a safty device to watch
over the ACTS satellite's performace of the microwave switch matrix mode.
This Terminal has statistics about the satellites rain fade and measured
quality of all links.
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Well there are more in the
proccess being made as I
speak so look forward for
an update...
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Why the Ka band?
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You may be asking, "why in the world is this satellite operating in the Ka
Band?" Well ACTS is the first satellite to actually transmit in the Ka band
and because of this people have to watch the weather 24/7 in little rooms so
they know when to notify the military if it will have bad signaling from the
rain... The reason it is placed around the Ka band is because it has a 2.4
spectrum avalible. This is is 5 times fater than at lower frequncey bands
such as where LEOS orbit around 400 to 1000 miles above earth.
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Spectrums Analysis and Explenation
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This section explians the Spectrum a little more than I have done at the top
so hang with me. The word "Spectrum" refers to a range of radio freqs that
are used, or a portion of radio waves to make phone calls or transmit certain
data. A freqency is the number of times each second that each radio wave
completes a cycle. There are many Spectrums that are broken up into bands by
the FCC. For example: Cordless phones are assigned to the 46 and 49 million
cycle (hertz) per second. A "hertz" refers to one cycle of a radio wave.
The higher the frequency, the more precious it is and this is why the Ka
band at 30/20 ghz is a little more precious and is checked for weather hourly
I have included the following weather analysys off NASA's server to show an
example:
-----------------------------------\ |-|
| \ | |
| USA \/ |
| |
| |
| |
| |
| |
| \ \
-----------------------------------------\ \
\_\ <-------- Bad Weather
Quickly The NOC Is
Notified and The ACTS
Satellite sits and
waits for the weather
to pass
The data is straight from the BBP of the satellite which transmits the data
to the NASA Glen Research Center Mater Control Center VAX where it is kept on
record for future research.
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MASTER CONTROL STATION ALARMS
(Alarm Severity: I-Info., S-Status, E-Error, W-Warning, F-Fatal)
Term# Date Time Severity Subsystem Msg Type Msg# Alarm Text
___________________________________________________________________________
___________________________________________________________________________
3 8/23/99 9:22:23 S LBR 11 17 Traffic terminal #3
is synchronized
3 8/23/99 9:58:12 S LBR 10 33 East & west scan
beam refresh
sequence ended
3 8/23/99 10:12:13 S LBR 10 61 LBR EXECURE buffer
now available
3 8/23/99 10:45:43 E LBR 11 1 Traffic terminal #3
is at loss of
synchronization
state
This represents what happens when something goes wrong with anything in or on
the satellite. Now here all we have are minor problems that happen durring
the signaling of the satellite hence the "Traffic terminal #3 is at loss of
synchronization state".
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The Following are of N channel circuit activity reports from the NASA
computer system. These represent successful and failed connection attempets
to the N channel Circuits:
N Channel Circuits - Successful Connections
Orig Start Circuit Call Destination Orig Channel Circuit Number
Term# Date Time Setup Duration Term# Number Type Channels
________________________________________________________________________________________
________________________________________________________________________________________
6 8/23/95 19:53:21 1 1049 6 4 1 2
6 8/23/95 19:58:57 2 87 1 2 2 2
N Channel Circuits - Failed Connections
Orig Start Circuit Destination Orig Channel Circuit Number Reject Reject
Term# Date Time Setup Term# Number Type Channels Code Reason
_____________________________________________________________________________________________
_____________________________________________________________________________________________
1 8/23/95 13:00:58 1 21 110 2 2 31 Destination Terminal Busy
1 8/23/95 15:33:46 1 2 787 2 24 41 Destination Terminal Shutdown
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Singale channel circuit Activity
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This is a list of the connections of "Voice Channel" Activitys these show
the destiniation earth station numbers and the channel number also the
circuit type that failed or succeded well routering to the destination:
Voice Circuit-Successful Connections
Start Call Destination Orig Channel Circuit
Term# Date Time Duration Term# Number Type
______________________________________________________________________
______________________________________________________________________
1 8/23/95 10:35:54 33 6 786 2
1 8/23/95 12:07:58 38 2 786 2
1 8/23/95 19:06:23 600 2 786 2
Voice Circuit-Failed Connections
Start Orig Dest Orig Circuit Reject Reject
Date Time Term# Term# Channel# Type Reason Text
_____________________________________________________________________________
_____________________________________________________________________________
5/17/95 11:17:34 1 12 787 2 20 Satellite Busy:
Insufficient
Destination Uplink
Capacity
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ACTS Anteana Reciver/Transiver
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The ACTS satellite has 5 anteana's ports for use in uplink and downlink
testing and contstruction. This provides the MCS (Clevland Mater Control
Center) to be able to measure the signal quality and test new uploading/
downloading tekniques and features. And to provide multisignaling within new
projets of the ACTS.
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|BaseBand Processer|
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The Base Band Processer is the the mind of the communications routing
features such as Voice Procssing, Video Signals, and Call Routing. This
system provides many things to the end users of the satellite on Earth. It
is said to be equal to a 5ess-2000 switch, and provides Time Division
Multiplexing of Radion Signals of the uplink and downlink flexibility within
the family of signaling. The BBP is programmed to make compatability within
the messege routing system on heavy and slow days at work. The switching and
routing of messeges are moved around at 64-kbps hence the ISDN onboard.
---------\
\--------
---------- | |
---------- | ACTS |
-> /--------|
| ----------/
-- Anteana Ports
When a Signal is transmitted to an Anteana on the ACTS it is compressed and
when the BBP recieves it, it is almost simotaniously sent to the most unused
downlink at that time and routed down into the earth stations reciever where
from there it will be decompressed and sent on its way to reach its
destination on the PSTN.
Here is an example of what the BBP switch looks like with all of its routing
features marked:
---------------------------------------------------------- ---------- -----------------------------------------------
|INPUT CHANNEL 1 | | | | OUTPUT CHANNEL 1 |
| ____________ | | | | ------- |
|| | --------- | | | | | | |
|| DEMODS | | | | | | | |PING-PONG| /---------- |
||------------| |PING-PONG| | | | | --- |-- / --------- | |
|| 110/55 | | MEMORY |--- | | | | | -- MEMORY |--|| // || |
|| | ______| |-- | ------- | | | | || | 2K x | || || ------ || | DOWNLINK
|| MSPS | |------| 2K x | | | | || | | | || | 64 BITS | || || | | || ----- | BEAM
||------------| || | 64 BITS | | | | FEC || | BASBAND | | || --------- || || | FEC | || | | \ NO. 1
|| | || |--------- | | | |___| ROUTING |___|--| -------- | -- -- | || | || | \
|| | || | |______|DECODER|___ ___ --| | | | ------ENCODER-- --- MOD |---- /
|| | || ______ || | SWITCH | | || |PING-PONG| || | ------ 110/55|---- /
|| OR |-------- | | | || | | | || | |- | | | | MSPS || |/
|| | || | | |_______|| | | | || | MEMORY |--- ------ | ||
--> || | || --------- | | | | | | | --- 2K x | ------ |
--> ||------------| || | | | | | | | | ---| 64 BITS | |
Uplink || 27.5/13.75 | || |PING-PONG| | | | | | | --------- |
Beam || | ||_____| MEMORY |-- | | | | | |
1 || MSPS | ------- |--- | | | | |
||------------| | 2K X | | | | | |
||------------| | 64 BITS | | | | | |
|| 27.5/13.75 | |---------| | | | | |
|| | | | | | |
|| MSPS | | | *| | |
------------------------------------------------------------ |*--------- \ -----------------------------------------------
| \
| |
------------------------------------------------------------ | --------- | --------------------------------------------------
| || | | | | |
| INPUT CHANNEL 2 || | CENTRAL | | | OUTPUT CHANNEL (2) |
Uplink| ||_| | | | Identical to OUTPUT CHANNEL (1) |
Beam | (INDENTICAL TO INPUT CHANNEL 1) | |PROCESSER|- -| |
No. 2 | | | | | |
--> | | | | | |
---------------------------------------------------------- | | --------------------------------------------------
---------
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This represents a signal uplinked to the satellites BBP system and what
functions are going on and how it handles the /voice/data/ and downlinks it
to the other subscriber of the ACTS terminal... The INPUT and OUTPUT channels
(2) are identical to the top ones in that they are just another anteana data
port for the enduser to connect to using his or her terminal...
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The ACTS satellite will help satellite communications for years to come even
though it was supposed to be a 4 year sat. We have expanded and now are
learning a magnificent amount of data as the dawn of the millenium occurs
this information will lead us in the way or maybe we are leading our selfs
into just a big gigantic technological mess... these things we will never no
but untill we do... we shall keep advancing...
I leave you with The Satellite Accronym list provided by NASA:
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List of Abreveations thanks to NASA:
APPPENDIX A LIST OF ABBREVIATIONS
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ACTS Advanced Communications Technology Satellite
BBP Baseband Processor
BER Bit Error Rate
BFN Beam Forming Network
Bps Bits Per Second
BPSK Binary Phase-Shift Keying
CDMA Code Division Multiple Access
CML Current Mode Logic
CMDS Commands
CMOS Complementary Metal Oxide Semiconductor
CR&T Command Ranging & Telemetry
DAMA Demand Assigned Multiple Access
DARPA Defense Advance Research Projects Agency
dB Decibel
D/C Down converter
DCU Digital Control Unit
ECL Emitter Controlled Logic
FDM Frequency Division Multiplexing
FDMA Frequency Division Multiple Access
FEC Forward Error Correction
FET Field Effect Transistor
Gbps Gigabits Per Second
GHz Gigahertz
HDR High Date Rate
HEMT High Electron Mobile Transistor
IBOW In Bound Order Wire
IF Intermediate Frequency
Kbps Kilobits Per Second
LSI Large Scale Integration
ms millisecond
MBA Multiple Beam Antenna
Mbps Megabits Per Second
MCS Master Control Station
MOSAIC Motorola Oxide Self-Aligned Implanted Circuit
MSM Microwave Switch Matrix
MSPS Mega Symbols Per Second
NASA National Aeronautics & Space Administration
NMT Network Management Terminal
ns Nanosecond
OBOW Out Bound Order Wire
OC Optical Carrier
QPSK Quaternary Phase Shift Keying
RCSA Receive Coax Switch Assembly
RF Radio Frequency
SMSK Serial Minimum Shift Keying
SNMP Simple Network Management Protocol
SONET Synchronous Optical Network
SQPSK Staggered Quaternary Phase Shift Keying
SSI Small Scale Integration
TCSA Transmit Coax Switch Assembly
TDM Time Division Multiplexing
TDMA Time Division Multiple Access
TEW Tracking Error Word
TLM Telemetry
TT&C Telemetry, Tracking & Command
TWTA Traveling Wave Tube Amplifier
U/C Up converter
VSAT Very Small Aperture Terminal
WIRS Waveguide Input Redundancy Switch
WORS Waveguide Output Redundancy Switch
written by lowtek ----> lowtek@deadprotocol.org
-----------------
This file was written mostly with public information
the signals are upon us...
and i am here to feed them
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