Free Notice (Other) - District Court of Federal Claims - federal

Case 1:02-cv-00796-FMA

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d. DATA OUTPUT. DATA OUTPUT the modem to the BIU. The signal levels

is a black digital data stream of DATA OUTPUT are +6 VDC.

from

e. MODEM READY LL. MODEM P~EADY LOW LEVEL is a status signal from the modem to the BIU; it indicates that the modem has completed preamble and is ready to accept DATA INPUT. The signal levels of MODEM F~EADY LL are +6 VDC when active and -6 VDC when not. f. SIGNAL ACQUIRED. SIGNAL ACQUIRED is a status signal from the modem t~ the BIU; it indicates that the modem has acquired data. The signal levels of SIGNAL ACQUIRED are +6 VDC when active and -6 VDC when idle. The BIU interprets this signal as OUTPUT DATA TRANSFER LL. 5-3.1.3 to/from AN/WSC-5(V) the transceiver Transceiver Baseband are discussed below. Functions. The interface signals

a. KEYLINE. KEYLINE is a control signal from the BIU to the transceiver; it is used by the transceiver to generate various keyline functions (i.e. TRANSMIT OUTPUT KEY). The signal levels of KEYLINE are ground transmit and open when not. b. TRANSMIT OUTPUT KEY. TKANSMIT OUTPUT KEY is a o~ntrol signal from the transceiver t~ the modem; it is used by the modem t~ place it in the transmit mode. The signal levels of TRANSMIT OUTPUT KEY are ground when enabled and open when not. c. R~4OTE DATA KEY. PH~OTE DATA KEY is a control signal from user terminal equipment to the transceiver; it is used by the transceiver to generate various keyline functions in the FM mode of operation. The signal levels of REMOTE DATA KEY are +12 VDC when active and 0 VDC when inactive. d. HEADPHONE AUDIO OUT. HEADPHONE AUDIO OUT is an audio signal output from the transceiver in the FM mode of operation. The signal level of HEADPHONE AUDIO OUT is 0 dBm (nominal). e. MIC AUDIO IN. MICROPHONE AUDIO IN is an audio signal input the transceiver in the FM mode of operation. The signal level of MIC AUDIO is 0 dBm (nominal). f. RI~OTE DATA IN. REMOTE DATA IN is a multiplexed signal from frequency division multiplexing (FDM) equipment ceiver. The signal level of REMOTE DATA IN is 0 dBm (nominal). g. REMOTE from the transceiver 0 dBm (nominal). to IN

tone package to the trans-

DATA OUT. REMOTE DATA OUT is a multiplexed tone package to FDM equipment. The signal level of REMOTE DATA OUT is

5-3.1.4 AN/WSC-5(V) Transceiver Intermediate Frequency Functions. The interface signals between the modem (OM-43A/USC or TD-1271B/U) and the transceiver are discussed below. a. 70 MHZ RCV. 70 MHZ RECEIVE is a modulated IF signal The signal level of 70 MHZ RCV is -123 to -53 dBm. from the

transceiver.

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EE130-PL-0MI-020~I42-UHFSATCOM

modem.

b. 70 MHZ ~IT. 70 MHZ TRANSMIT is a modulated The signal level of 70 MHZ ~4T is 0 (+I) dBm.

IF signal

from

the

5-3.1.5 AN/WSC-5(V) Transceiver Radio Frequency Functions. The interface signals between the transceiver and the antenna are discussed below. a. ~4T RF. TRANSMIT RADIO FREQUENCY is a modulated RF signal within the frequency range of 292 to 312 MHZ. The signal level of ~T RF is 100 watts when a single modem position is transmitting and 13.5 watts per modem position with all positions transmitting. b. RCV RF. RECEIVE RADIO FREQUENCY the frequency range of 248.5 to 270.1MHz. is a modulated RF signal

within

5-3.1.6. AN/WSC-5(V) Satellite Terminal PSK Non-D~A Mode Functional Signal Flow. Signal flow through the AN~SC-5(V) satellite terminal in the PSK nonDAMA mode of operation is discussed in the following subparagraphs. a. Transmit Signal Flow. Transmit satellite terminal is as follows: signal flow through the AN/

WSC-5(V)

(I) Transmit operation
BASEBAND switchto KEYLINE ON.

is initiated by the user terminal providing or by setting the BIU fren~ panel KEY ON/OFF

(2) The BIU provides KEYLINE to the C-S202A/WSC-%
ates various C-8202A/WSC-I USC.

IV) which generkey functions for use in the transcelver. The (V) provides TRANSMIT OUTPUT KEY to dle tID-905A/

The MD-905A/HSC generates a modem preamble and MODLM KEADY LL. The BIU uses MOD~ READY LL to generate MODEM READY and routes both MODe4 READY LL and MODEM READY to the user terminal.

(4) The BIU routes TRANSMIT BIT TIMING from the MD-905A/USC

to ~he user terminal as ~T CLOCK in HDR and HDR/LD~ operation. (Y~MT CLOCK may be used to clock X/4T DATA into the modem.) :;24T DATA from the user terminal is routed through Lhe BIU to the MD905A/USC as DATA INPUT. PSK modulates and up-converts DATA INPUT to 70 MHZ XMT. 70 MHZ ~4T is routed through the SB-4123~qSC-5(V) to the CV-3067/WSC-5(V) where it is up-converted to the trans¯ ~t RF frequency. which ampli-

(5) The MD-905A/USC

(6)

The RF signal is passed to the ~-6600~qSC-5(V) fies the signal to transmit power levels.

(7)

The powez amplified RF signal is routed ~nrough the SB-3835/ WSC-5(V) to the TD-1097~qSC-5(V) which combines the RF signal with up to three other RF signals. The resulting XMT RF is routed WSC-5(V) to the ~4-660~SC-5(V). back through the SB-3835/

(8)

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(9)

The AM-6601/WSC-5(V) antenna transmission

couples XMT RF to the AN/WSC-5(V) SATCOM line for transmission to t, he satellite. signal flow through the AN/

WSC-5(V)

b. Receive Signal Flow. Receive satellite terminal is as follows:

The AM-6601/WSC-5(V) isolates RCV RF from the AN/WSC-5(V) SATCOM antenna transmission line and provides amplification to the received signal. (2) The amplified RCV RF is routed through the SB-3835/WSC-5(V) where the signal is amplified and split into eight separate RCV RF signals. One signal is routed to each R-1842/WSC-5(V) and one to each CV-3068/WSC-5(V).

(3)

For modem positions ~ and 4 the R-1842/WSC-5(V) down-converts RCV RF to 70 MHZ RCV and routes the signal to the SB-4123/ WSC-5(V). For modem positions other than I and 4, the CV-3068/WSC-5(V) splits the RCV RF into 3 separate signals, down-converts each to 70 MHZ RCV and routes the signals to the SB-4123/WSC-5(V). The signal 70 MHZ RCV is routed through the SB-4~23/WSC-5(V) to the MD-905A/USC. The MD-905A/USC down-converts and demodulates the 70 MHZ RCV and outputs DATA OUTPUT, RECEIVE BIT TIMING and SIGNAL ACQUIRED to the BIU. to generate and routes OUTPUT DATA TRANSFER both signals to the

(4)

(5)

The BIU uses SIGNAL LL and OUTPUT DATA user terminal.

ACQUIRED T~ANSFER

(6)

The BIU routes RECEIVE BIT TIMING from the MD-905A/USC to the user terminal as RCV CLOCK. (RCV CLOCK may be used to clock DATA OUTPUT into the user terminal.) DATA OUTPUT from the MD-905A/USC is routed through the BIU to the user terminal as RCV DATA. If operating LDR (teletype) or HDR XMIT/LDR RCV, DATA OUTPUT is routed through the BIU to the user terminal as RCV TTY DATA. When no more signal is received, OUTPUT DATA TRANSFER LL causes the BIU to generate a steady mark (+6 VDC) on the RCV TTY DATA signal line.

(7)

5-3.1.7 AN/WSC-5(V) Satellite Terminal FM Non-DAMA Mode Functional Signal Flow. FM mode may be either FM voice or FM data operation and is only possible on modem positions I and 4. Signal flow through the AN/WSC-5(V) satellite terminal in FM non-DAMA mode of operation is discussed in the following subparagraphs. a. Transmit Signal Flow. Transmit satellite terminal is as follows: signal flow through the AN/

WSC-5(V)

(~)

Transmit operation is initiated by the user terminal providing REMOTE DATA KEY or by setting the key switch to ON. This generates various key functions for use in the transceiver.

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(2]

In FM data operation, R~MOTE DATA IN from the station transmitter transfer switchboard is sent to an equalization network. In FM voice operation, MIC AUDIO INPUT is routed to the C-9184/WSC-IA where it is impedance matched and gain controlled to generate HEADPHONE AUDIO back to the station receiver transfer switchboard. The equalized tone package (R~MOTE DATA IN) or the impedance matched audio signal (MIC ADDIO INPUT) is routed to the CV3067/WSC-5(V) which frequency modulates and up-converts the signal to the transmit RF frequency. which

3)

4)

The transmit RF signal is sent to the ~M-6600/WSC-5(V) amplifies the signal to transmit power levels.

5)

The power amplified RF signal is routed through the SB-3835/ WSC-5(V) to the TD-1097/WSC-5(V) which combines the RF signal with up to three other RF signals. The resulting XMT RF is routed WSC-5(V) to the AM-6601~qSC-5(V). The AM-6601/WSC-5(V) antenna transmission back through the SB-3835/

(6)

{7)

couples XMT RF to the AN/WSC-5(V) SATCOM line for transmission to the satellite. signal flow through the AN/

WSC-5(V)

b. Receive Signal Flow. Receive satellite terminal is as follows:

The AM-6601/WSC-5(V) isolates RCV RF from the AN~4SC-5(V) SATCOM antenna transmission line and provides amplification to the received signal. (2) The amplified RCV RF is routed through the SB-3835/WSC-5(V) where the signal is amplified and split into eight separate RCV RF signals. One signal is routed to each R-1842/WSC-5(V) and one to each CV-3068/WSC-5(V). For modem positions one converts and demodulates PHONE AUDIO OUT. and four the R-1842~SC-5(V) downRCV RF to REMOTE DATA OUT or HEAD-

(3)

(4)

R~4OTE DATA OUT is routed to the station receiver transfer switchboard. HEADPHONE AUDIO OUT is routed to the station receiver transfer switchboard via the C-9184/WSC-5(V) where is impedance matched and gain controlled to output levels. Signal Flow. D~4A mode of

5-3.1.8 AN/WSC-5(V) Satellite Terminal D~,~ Mode Functional Signal flow through the ~SC-5(V] satellite terminal in the operation is discussed in the following subparagraphs. a. Transmit Signal Flow. Transmit satellite terminal is as follows: (I) Transmit operation is initiated KEY ON/OFF switch to ON. signal flow

through

the

WSC-5(V)

by setting

the BIU front

panel

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(2)

The BIU provides KEYLINE to the C-8202A/WSC-1(V) which ates various key functions for use in the transceiver.

gener-

- (3)

70 MHZ XMT is routed from the TD-1271B/U through the SB-4123/ WSC-5(V) to the CV-3067/WSC-5(V) where it is up-converted the transmit RF frequency. The RF signal is passed to the AM-6600/WSC-5(V) fies the signal to transmit power levels. which ampli-

(4)

(5)

The power amplified RI = signal is routed through the SB-3835/ WSC-5(V) to the TD-1097/WSC-5(V) which combines the RF signal with up to three other ~F signals. The resulting XMT RF is routed WSC-5(V) to the AM-660~/WSC-5(V). The ~4-6601/WSC-5(V) antenna transmission back through the SB-3835/

(6)

(7)

couples XMT RF to the AN/WSC-5(V) SATCOM line for transmission to the satellite. signal flow through the AN/

WSC-5(V)

b. Receive Signal Flow. Receive satellite terminal is as follows: (I

The AM-6601/WSC-5 (V) isolates RCV RF from SATCOM antenna transmission line and provides the received signal.

the AN/WSC-5(V) amplification to

(2

The amplified RCV RF is routed through the SB-3835/WSC-5(V) where the signal is amplified and split into eight separate RCV P~F signals. One signal is routed to each R-1842/WSC-5(V) and one to each CV-3068/WSC-5(V). For modem positions I and 4, the R-1842/WSC-5(V) down-converts RCV RF to 70 MHZ RCV and routes the signal to the SB-4123/ WSC-5(V). For modem positions other than I and 4, the CV-3068/WSC-5(V) splits the RCV RF into 3 separate signals, down-converts each to 70 MHZ RCV and routes the signals to the SB-4123/WSC-5(V). 70 MHZ RCV OUTPUT the TD-1271B/U. is routed through the SB-4123/WSC-5(V)

(3

(4)

5-3.2 AN~qSC-3(V) SHORE SATELLITE TERMINAL. The satellite terminal performs the functions of transmitting signals to, and receiving signals from, a GAPFILLER, FLTSATCOM or LEASAT satellite. The transmit and receive functions described in the following subparagraphs discuss specific equipment interfaces required to perform these functions. Table 5-14 lists all the signals discussed below; F0-41 diagrams signal flow. 5-3.2.1 RT-I107/WSC-3 Transceiver Baseband Functions. The interface signals between the user terminal and the RT-II07/WSC-3 transceiver are discussed below. Actual application of these interface signals will differ with the connected user terminal equipment. Refer to section 5-4 for user terminal interfaces to the RT-1107/WSC-3. AMENDMENT 0007 K - 32

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and used by the transce±ver ~c~slace

_~;~ in The RT-~I07/~MSC-3 outputs a +2 VDC

that

b. ~2.~T BIT TIMING. TP~ANSMIT BIT TIMING is a black clock signal is generated by the transceiver and used by the user zerminai to clock

XMT LL DATA out. The signal levels of .~4T BIT TL'4ING are +__6 VDC. c. ~{T LL DATA. .~-~ANSMIT LOW LEVELw~.n-'~" Ls a black (encrypted) digital data stream ~nat ~= .... k_~ ou~ of the user __.mln~ on the low-tohigh transition of ~4T BIT .~AING. The signal levels of ~T LL DATA are +6 VDC. d. RCV is generated HIT TIMING. ~ECEIVE BIT TIMING is a black clock signal by the zransceiver and used by ~he user terminal to clock +__6

that

RCV LL DATA in. The ~ignal levels ~f~ RCV BIT ~_.~ING are

e. RCV LL DATA. ~ECEIVE LOW LEVEL DATA is a olack (encrypted) digital data stream that is clocked out of the transceiver on the high-to-low transition of RCV BIT .~~4ING. The signal levels of RCV LL DATA are +__6 VDC. f. DATA MODE CHANNEL BUSY. DATA MODE CHANNEL BUSY indicates that the transceiver is genera tlng RCV LL DATA and RCV BIT TIMING. DATA MODE CHANNEL BUSY is a black control signal with signal levels of +6 VDC in receive (signal acquired) and -6 VDC when idle. g. DATA SIG ACQ IND. DATA SIGNAL ACQUIRED INDICATE is a black status signal that ~s generated in the transceiver and used by the user terminal to turn on Lhe receive indicate lamp. DATA SIG ACQ IND is at ground when a signal with data present is being received and open when idle. h. ~OUND ~: TRANSMIT. GROUND fE TRANS,{IT ~a a black status signal that is generated !n nhe uransceiver and used by the user ~erminal to turn en the transmit indizate lamp. GROUND IN TRANSMIT is at ground in transmit and open when idle. i. ~T WB VOICE. TRANSMIT WIDEBAND with a 25-kHz bandwidth at 12 V peak-to-peak. i. RCV WB VOICE. P~ECEIVE WIDEBAND with a 25-kHz bandwidth at 0.5 V peak-to-peak. VOICE is a secure voice input

VOICE

is a secure

voice

output

j. -=T_T }~YLINE. PUSH-TO-TALK KEYLINE is provided by the user terminal and used by the transceiver to place it in transmit. The signal is at ground in transmit and open when not in transmit. ~ne RT-I107/WSC-3 outputs a +12 VDC bias voltage when this signal is open. 5-3.2.2 signals RT-~I07/WSC-3 Transceiver Radio Frequency Functions. The interface between the RT-II07A~SC-3 and the antenna group are discussed below. within the frepower output is

a. ~T P2. TRANSMIT RF is a modulated RF signal quency range of 225.000 to 399.975 MHz. The transmitter 100 watts (maximum).

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EE I 30-PL-OM 1-020/W I 42-UHFSATCOM

b. RCV

RF.

~ECEIVE

RF

is a modulated MHz.

RF

signal

within

the

fre-

quency range of 225.000

to 399.975

5-3.2.3 Antenna Group Functions. The 6hntenna directs/radiates RF power to a satellite and receives/captures RF signals radiated from a satellite. To accomplish this function the antenna must be in view of the satellite (not blocked) and must be pointed/focused at the satellite. The antenna group may also incorporate a diplexer to couple/isolate XMT RF and RCV RF to the antenna transmission line. 5-3.3 AN/SSR-I AND AN/SSR-IA SHORE SATELLITE TERMINAL. The AN/SSR-I or AN/SSR-IA terminal performs the functions of receiving downlink signals relayed by a GAPFILLER, FLTSATCOM Or LEASAT satellite, down-converting, demodulating, demultiplexing and providing 16 75-baud teletype outputs. Ashore, this terminal provides the capability of receiving the FLTSATBCST signal for off-the-air monitoring and rekeying. Table 5-15 lists all the signals discussed below; FO-45 diagrams signal flow. 5-3.3.1 Antenna Functions. The RF signal received by the antenna was transmitted by a shore station and relayed by a satellite. The frequency of the received carrier is in the range of 248.85 to 258.85 MHz, and the signal level ranges from background noise to -97 dBm maximum. From the antenna, the received signal is coupled through a coaxial cable to an AM-6534/SSR-I amplifier-converter. 5-3.3.2 A~...-6534/SSR-I Amplifier-Converter Functions. The AM-6534/SSR-I functions include filtering, RF signal amplification, frequency downconverting, IF signal amplification and switching of the input signal (test mode only). The P,F input from the antenna is filtered to preserve the system noise figure and suppress out-of-band interference. The AM-6534/SSR-I receives a local oscillator (LO) signal and +20 VDC operating power from the MD-900/SSR-I combiner-demodulator. These signals are coupled to the ~M-6534/ SSR-1 via a twinaxial cable. The LO signal is -23 dBm at the AM-6534/SSR-1 input. The LO signal is mixed with the received RF to derive an IF signal (approximately 19.95 MHz). This signal is coupled to the MD-900/SSR-I also through the twinaxial cable. The +12 VDC relay power is present only when the NORM-OFF-RLY switch {inside the MD-900/SSR-~) is set to RLY. This +12 VDC is coupled to the AM-6534/SSR-I also via the twinaxial cable. This voltage is used to energize a relay that disconnects the antenna from the AM-6534/SSR-I RF input and terminates its input with a 50-ohm load. with the other three channels turned off, the gain of the amplifier-filter modules in the MD-900/ 88R-I can be set without the influence of a signal. 5-3.3.3 MD-900/SSR-I Cc~nbiner-Demodulator F~nctions. The M~-900/SSR-I provides 2 functions: it supplies the LO signal and +20 VDC power for operation of each AM-6534/SSR-1 and it provides +12 VDC relay voltage in the test mode. The incoming IF signal is coupled through the same twinaxial cable that couples the outgoing LO signal and +20 VDC power. The frequency of this IF signal is 19.95 MHz nominal and the signal level is -54 dBm maximum. Noise components and unwanted frequencies are removed by a narrowband filter. The signal demodulation depends on the setting of the DEMOD MODE switch {FM or PSK). For FM, the demodulated signal is a 300 to 3,400-Hz tone package at level which is adjustable from -25 to +10 dBm. For PSK, the demodulated signal is a 1,200-bps data stream at a signal level of ~ volt peak-to-peak minimum. The demodulated FM or PSK signal may be monitored at the OUTPUT MONITOR AMENDMENT 0007 K - 36

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-~

7

7

7

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jack on the front panel by means of a headset. For FM, the tone package is output to HF transmitter equipment for rekey. For PSK, the I, 200-bps data stream is output to the TD-1063/SSR-I or TD-1063A/SSR-1 demultiplexer. 5-3.3.4 TD-1063/SSR-I and TD-1063A/SSR-I Demultiplexer Functions. The TD1063/SSR-I and the TD-1063A/SSR-1 perform the same function and only differ in their outputs. This discussion applies to beth unless otherwise indicated. During operation in the FM mode the TD-1063/SSR-1 is not used. In the PSK mode the TD-1063/SSR-I processes the 1,200-bps data stream, supplied by the MD-900/SSR-I, to derive 15 data output channels. The 16th channel contains a repetitive synchronization pattern that is also available for quality control monitoring by teletype or test equipment. The TD-~063/SSR-I is capable of keying 20 to 120-milliampere, neutral telegraph loops. The TD-1063A/SSR-1 can drive low level +6 VDC interfaces (with replacement of the TTY switch driver modules) as well as key high level telegraph loops. These interfaces are discussed in section 5-4. 5-3.3.5 AN/SSR-I and AN/SSR-1A D~4A Operations. With the implementation of DAMA in the Navy UHF SATCOM System, the AN/SSR-I and AN/SSR-IA terminal will be provided with an additional mode of operation. In this FLTSATBCST fallback mode, the DAMA multiplexer outputs a I, 200-bps data stream which is patched directly to the TD-1063/SSR-I or TD-1063A/SSR-1, bypassing the MD-900/SSR-I. An added testing capability not presently found on the AN/SSR-I and AN/SSR-IA terminal allows for the monitoring of the 1,200-bps data stream from the MD900/SSR-I Or TD-1271B/U via a monitor panel. This monitoring will aid in troubleshooting and confidence testing the AN/SSR-I or AN/SSR-IA terminal. 5-3.4 0K-481(V)2/FSC AND OW-101/FSC DAMA SHORE SATELLITE TERMINALS. The OK-48~(V)2/FSC and OW-101/FSC provide the physical interfaces between user terminal equipment, receiver/transmitter equipment, and the TD-1271B/U multiplexer(s). The OK-481(V)2/FSC interfaces with the AN/WSC-5(V) satellite munications set. The OW-101/FSC interfaces with the AN/WSC-3(V) satellite communications set. The following subparagraphs discuss the TD-1271B/U and its specific interfaces. Table 5-16 lists all the signals discussed below. F0-48 diagrams signal flow in the 0K-48~ (V)2/FSC DAMA satellite terminal. FO-52 and F0-53 diagram signal flow in the OW-101/FSC DAMA satellite terminal half and full duplex radio configurations, respectively. 5-3.4.1 TD-1271B/U Multiplexer. The TD-1271B/U performs the functions of combining up to 4 baseband digital data streams into I time division multiplexed serial data stream, PSK modulating a 70-MHz IF carrier and providing this IF to the radio group for transmission to a satellite. The TD-1271B/U also receives a 70-MHz IF modulated carrier from the radio group, downconverts, demodulates, demultiplexes and provides up to 4 digital date stream outputs to baseband equipment. The TD-1271B/U accomplishes these functions using time division multiple access (TDMA) technology. The primary TDMA mode for Navy operations of the TD-1271B/U is the TDMA-1 mode. TDMA-I provides I, 696 unique frame formats to accommodate various user data rates, receiver sensitivity and the radio frequency interference (RFI) environment. There are two additional TDMA modes (TDMA-2 and TDMA-3). These two modes of operation are designed for aircraft use and have wide guard times between bursts to allow for platform motion and operation without ranging. These 2 modes only allow 75-baud user data rates. Two non-TDMA modes use the TD-1271B/U as a standard modem with no multiplexing on the channel. (The non-TDMA modes will

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Q,

TGMAq FRAME FORMATS. BURST CODE AND RATES SELECTABLE DATA TIMESLOT FORMAT~ A OATA T~E SLOTS

FRAME LENGTHS385 SEC I

B-00, B-2THRU B-F DATA TIMESLOTS 1T011 USERS

I
I

c 0ATA TIMESLOTS 2TO6 USERS

TDMA-2RAME F FORMAT. BURST 2.4 KSPS, RATE CODE RATE I/2

SLOT I/0 RATE

t

75 BPS t GUARD75 BPS 75 BPS 75 BPS 75 RPS 75 8PS 78 BPS 75 8PS 75 BPS 75 8PS

FRAME LENGTHS SEC 8.32

TOMA-3 FRM/,E FORMAT. BURST RATE KSPS. 2.4 CODE RATE314 SLOT CCOW CCOW ]RCCOW~ 1/0 RATE 75BPS 2 3 4 5 6 7 8 9 10 11

GUARDITSBF'S "/SBPS 75BPS 1755FS 75BPS 75RPS 755RS ?SBPS 78S~G 755~G 785P$ 78RPS

Figure 5-I.

TDMA Frame

Format

Structures

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not operate with present baseband equipment; vided.) The non-TDMA modes operate at 2,400 format structures are shown in Figure 5-I.

no control functions are proor ~6,000 bps. The TDMA frame

5-3.4.1.1 TDMA-I Frame Format Structure. The TDMA-I frame format structure provides choices of input data rates of 75, 300, 600, 1,200, 2,400, 4,800 and ~6,000 bps and output burst rates of 9,600, 19,200 and 32,000 symbols per second (sps) using either I/2 or 3/4 rate convolutional coding. Symbols are constructed in the error control circuitry from the input data bits. The ]/2 rate coding, used in higher noise environments, produces 2 symbols for I input data bit while the 3/4 rate coding, used in lower noise environments, produces 4 symbols for 3 input data bits. The 9,600 and 19,200-sps burst rates use hi-phase shift key (BPSK) modulation while the 32,000-sps burst rate uses differentially encoded quadra-phase shift key (DEQPSK) modulation. The TDMA-I frame interval is 1.386 seconds and is divided into 7 time slots that are discussed below. a. Data Time Slots. There are three data time slot segments: A, B and C. Each of these may be assigned one of many different formats which, when coupled with each other, provide ],696 unique frame formats for communications. b. Orderwire Time Slots. There are two orderwire time slots. T~e Channel Control Orderwire (CCOW) is the time slot for the transmission of system timing and control information from the channel controller to subscriber units. It provides the subscriber units with information such as system timing and configuration of a particular satellite RF channel. This transmission occurs at the beginning of each frame. The Return Channel Control Orderwire (RCCOW) is used by the subscriber u,nit operator to provide information to the channel controller. Transmissions on the CCOW are received by all subscriber units; transmissions on the RCCOW are received only by the channel controller. When implemented, the TSEC/KGV-11 electronic key generator will cryptographically protect the CCOW and RCCOW. c. Link Test Time Slot. This slot is used to conduct a link test to determine system link performance. The link test time slot is a buffer which protects the crow during half duplex receiver/transmitter (R/T) operation. It prevents baseband slot transmission from occurring simultaneously with reception of the crow data. This interference between time slots is referred t~ as contention. It occurs only for a terminal which is operating half duplex and does not effect any other terminal. d. Ran~in~ Time Slot. In order to transmit user data, each unit must first acquire range lock. The ranging time slot provides a time period in each odd frame which is sequentially used by each unit in a coverage area ts establish transmit synchronization. This allows the guard time between time slots to be minimized. All time slots have at least 875 microseconds of unmedulated carrier t/me to accommodate transmit RF power turn-on plus synthesizer frequency settling. A minimum of 1.2 milliseconds of guard time between adjacent bursts is provided for satellite range variations during periods of no ranging activity, except after CCOW transmission in which case the guard time is 820 microseconds. After range lock has been acquired, periodic ranging is automatically performed; the time between rangings may not exceed 95 minutes. AMENDMENT 0007 K ~ 44

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5-3.4.~.~ TD-127~B/U Mq, lti~lexer input/Output (I/O) Port Interface. The TD1271B/U has four I/O ports. Given below are the interface signals for one I/O por~. The interface signals used will differ according to which user terminal is connected to the I/O port; this discussion is applicable to all interfaced user terminals. TD-~27~B/U. Refer to section 5-4 for user terminal interfaces to the

a. DATA SLOT TIME MARK. DATA SLOT TIME MARK is a low level, unbalanced output that is active only when the associated I/O port is assigned to a D~4A time slot. The signal is generated for each DAMA slot once each DAMA frame (1.386 seconds). Normally at +6 VDC, DATA SLOT TIME MARK is 5 millisecond pulse to -6 VDC with the transition back to +6 VDC coincident with GND KEY R/T going to ground (if there is data to transmit). This signal indicates to baseband equipment when the DAMA frame transmit time occurs for the I/O port. The signal is used in the ON-143(V)9/USQ to synchronize the timing of data transmissions. b. ~4IT P~q. TRANSMIT REQUEST is a balanced or unbalanced input with signal levels of +6 VDC. At +6 VDC, this input will indicate to the TD-1271B/U that baseband equipment is ready to output digital data; -6 VDC indicates baseband equipment is idle. XMIT REQ must remain at -6 VDC for a minimum of 7 milliseconds before rekeying. Baseband equipment interprets this signal or GND LEVEL KEY (see below) as DATA KEYLINE. c. GND LEVEL KEY. GKOUND LEVEL KEY is a ground/open input. Ground potential at this input will indicate to t-he TD-I 271B/U that baseband equipment is ready to output digital data; an open input indicates baseband equipment is idle. GND LEVEL KEY must remain open for a minimum of seven milliseconds before rekeying. When open, approximately +4 %~3C from the TD127~B/U is present. Baseband equipment interprets this signal or XMIT REQ (see above) as DATA KEYLINE. d. OUTPUT CLOCK B. OUTPUT CLOCK B is a low level, balanced or unbalanced output generated by the TD-127~B/Uo Either this signal or INPUT CLOCK (see below) is used by baseband equipment to clock SERIAL INPUT DATA into the TD-1271B/U. The signal levels of OUTPUT CLOCK B are +5 VDC. Baseband equipment interprets this signal as ~T CLOCK. e. INPUT CLOCK. INPUT CLOCK is a low level, balanced or unbalanced input generated by the IG or station clock. Either this signal or OUTPUT CLOCK B (see above) is used by baseband equipment to clock SERIAL INPUT DATA into the TD-1271B/U. band equipment interprets The signal levels of INPUT this signal as ~4T CLOCK. CLOCK are +--6 VDC. Base-

f. SERIAL INPUT DATA. SERIAL INPUT DATA is a low level, balanced or unbalanced input. The signal levels of SERIAL INPUT DATA are +-6 VDCo Baseband equipment interprets this signal as ~IT DATA. g. OUTPUT CLOCK A. OUTPUT CLOCK A is a low level, balanced or unbalanced output. The signal is used by baseband equipment to clock OUTPUT DATA from the TD-1271B/U into baseband equipment. The signal levels of OUTPUT CLOCK A are +__5 VDC, Baseband equipment interprets this signal as RCV CLOCK.

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h. OUTPUT DATA. OUTPUT DATA is a low level, balanced or anced output. The signal levels of OUTPUT DATA are +5 VDC. Baseband ment interprets this signal as RCV DATA. --

unbalequip-

i. TX ACK. TRANSMIT ACKNOWLEDGE is a low level, balanced or unbalanced output. A signal level of +6 VDC indicates that the TD-1271B/U is ready to accept data for transmission. A signal level of -6 VDC indicates the TD-~271B/U is idle. The signal will switch from -6 VDC to +6 VDC within 5 milliseconds after the TD-~27~B/U receives GND LEVEL KEY or ~4IT REQ. j. TX ACK LAMP. TRANSMIT ACKNOWLEDGE LAMP is a ground/open output. This status signal is used by baseband equipment to turn on the transmit indicate lamp. Ground potential indicates that the TD-1271B/U is ready to accept data for transmission; an open indicates the TD-1271B/U is idle. When open, TX ACK LAMP will be at +6 VDC from the TD-1271B/U via the transmit indicate lamp in the user terminal. Baseband equipment interprets this signal as GROUND IN TRANSMIT. k. SIG ACQ. SIGNAL ACQUIRED is a low level, unbalanced output. A signal level of +6 VDC indicates to baseband equipment that a burst is being received that contains data for the I/O port assigned a time slot. A signal level of -6 VDC indicates the TD-1271B/U I/O port is idle. The signal will switch from -6 VDC to +6 VDC approximately I millisecond before the first data bit is transferred from the I/O port and will switch back to -6 VDC after the last data bit has been transferred to baseband equipment. Baseband equipment may interpret this signal as DATA MODE CHANNEL BUSY. i. SIG ACQ LAMp. SIGNAL ACQUIRED LAMP is a ground/open output. This status signal is used by baseband equipment to turn on the receive indicate lamp. Ground potential indicates that a burst is being received that contains data for the I/O port assigned a time slot; an open indicates the TD-1271B/U I/O port is idle. When open, SIG ACQ LAMP will be at +6 VDC from the TD-~271B/U via the lamp in the user terminal. Baseband equipment interprets this signal as DATA SIG ACQ IND. m. LOOPBACK. LOOPBACK is a balanced of +6 VDC. When LOOPBACK is +6 VDC: (I) (2) (3) SERIAL INPUT or unbalanced input with sig-

nal levels

DATA is routed to OUTPUT to +6 VDC, to +6 VDC,

DATA,

TX ACK is forced SIG ACQ is forced

(4) OUTPUT CLOCK A is taken from INPUT CLOCK if TD-1271B/U

is strapped for external clock. If strapped for internal clock, OUTPUT CLOCK A is recovered from SERIAL INPUT DATA, OUTPUT CLOZK B is unchanged.

(5)

This signal can be used with an external computer (ON-143(V)9/USQ) to test integrity of the interface to the I/O port without an actual assignment of a DA~ time slot.

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5-3.4.1.3 TD-1271B/U Multiplexer Remote Request Interface (RRI) Port. The TD-~273B/U has four RRI ports which correspond to the four I/O ports. Given below are the interface signals for one RRI port. This discussion applies to all four RRI ports. The application of the RRI function is under review. a. RRU TX. or unbalanced output. baseband equipment. R~OTE REQUEST ~IT This signal outputs TRANSMIT is a low level balanced serial s~atus and data stream to

bo RRU RX. RID4OTE REQUEST ~IT RECEIVE is a low level balanced or unbalanced input. This signal inputS serial status and data stream from baseband equipment to the TD-1271B/U. c. RRU CTS. REMOTE REQUEST UNIT CLEAR TO SEND anced TTL compatible -6 VDC input, This signal indicates that baseband equipment is connected to the RRI port. (NOT) is an unbalto the TD-127~B/U

5-3.4.~.4 TD-1271B/U Multiplexer Teletype (TTY) Interface. The TD-1271B/U may be strapped to operate with either a 20 or 60-milliampere current loop. This capability is not used ashore and the TTY I/O connector (JS) is not wired to the baseband patch panel. 5-3.4.1.5 TD-~271B/U Mul~iplexer Synchronization (SYNC) Interface. The TD1271B/U may be patched to either provide or accept synchronization timing to or from other TD-1271B/Us at the station. The synchronization timing of all TD-I 271 B/Us at the station are interconnected via the SYNC IN and SYNC OUT connectors. The source of system timing is the unit designated by front panel keyboard entry as the system timing generator (STG). 5-3.4.1.6 TD-1271B/U Multiplexer Intermediate below are the IF interface signals. Fre~.uenc Z Interface. Given

ulated

a. 70 MHz IF ~T. 70 MHz IF TRANSMIT is a phase shift key IF output to the transceiver. The signal level is 0 (~I) dBm.

mod-

b. 70 MHz IF RCV. 70 MHz ulated IF input from the transceiver. (nominally -I08 to -85 dBm).

IF RECEIVE is a phase shift key modThe signal level is -108 to -53 dBm,

5-3.4.1.7 ~-1271B/U ~-~iti~lexer Receiver/Transmitter Interface, Tb_is interface ls not used when operating with the AN/WSC-5(V). However, the ~nterface is provided on the OK-48~ (V)2/FSC for interconnection of the RT-~I07/WSC-3 associated with the AN/FSQ-131 satellite signal analyzer. -~e RT-II07/WSC-3 will be modified to operate with the TD-1271B/U (see paragraph 5-3.4.2). The TD-1271B/U can operate in a full duplex radio configuration. However, the RT-~07/WSC-3 transceiver is half duplex; to operate full duplex, two RT-~07/ WSC-3 transceivers must be used. Full duplex operation provides unrestricted access to all time slots in the DAMA frame; up to four baseband user terminals can be supported. Half duplex operation limits the number of D~4A time slots in which the station can transmit and receive data; a maximum of three baseband user terminals can be supported (due to transmit/receive time slot con~ention). FO-52 and FO-53 diagram signal flow of the OW-10]/FSC D~A satellite terminal half and full duplex configurations, respectively. Given below are the interface signals required for these configurations.

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