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

Case 1:02-cv-00796-FMA

Document 46-23

Filed 03/18/2005

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a. G~ KEY R/T. GROUND KEY RECEIVER/TRANSMITTER is a ground/open output. Ground potential at this output commands the transceiver to transmit. When open,, the transceiver outputs a +2 VDC bias voltage. The transceiver interprets this signal as DATA KEYLINE. b. PRESET CHANNEL SELECT. PRESET CHANNEL SELECT is a low level, MIL-STD-188-114 unbalanced output. These signals are provided on a six-wire (five signal, one return) command circuit. The PRESET CHANNEL SELECT circuit provides digital command signals to the transceiver to select the desired preset operating radio frequency. The TD-1271B/U provides two sets of PRESET CHANNEL SELECT signals: XMT and RCV. In a half duplex configuration only the XMT set is used. The TD-1271B/U supplies XMT PRESET CHANNEL SELECT signals that cause the transceiver to transmit on the desired preset frequency when the key signal supplied by the TD1271B/U indicates transmit. When the key signal changes to receive the transceiver automatically changes to the proper receive frequency (assuming its frequency offset function is properly set). (2) In a full duplex configuration the >LMT PRESET CHANNEL SELECT signals are connected to the transceiver which is the transmitter. The RCV PRESET CHANNEL SELECT signals are connected to the transceiver which is the receiver. The key signal from the TD-~271B/U is connected to the transmitter with the receiver remaining in the receive mode. The two sets of control lines independently command the transmitter and receiver to change to the desired preset frequency. The preset channels on the transceiver are manually set to the required frequencies. output to the

transceiver

c. REMOTE INTERLOCK. REMOTE INTERLOCK is a ground which enables the PRESET CHANNEL SELECT circuits.

5-3.4.2 RT-II07/WSC-3 Transceiver Modifications. The implementation of D~MA into the Navy UHF SATCOM System imposes new requirements on the performance of the RT-1107/WSC-3 transceiver. Specifically, it must be capable of changing frequency and stabilizing on a new frequency (within 50 Hz) in less than 800 microseconds. The non-DAMA RT-I107/WSC-3 requires 40 milliseconds +10 milliseconds to change and stabilize. A modification developed for the RT-II07/WSC-3 achieves the faster response time. When this modification is installed the RT-II07/WSC-3 becomes the RT-1107A~qSC-3 or, more commonly, the AN/WSC-3A. Presently, the modification only affects the standard SATCOM set (B serial numbers). An interim D~MA modification (IDM) is available for AN/WSC-3(V)2 and AN/WSC-3(V)3. The IDM provides improved transmission sponse time but not rapid frequency switching. A modified transceiver (AN/ WSC-3A) must be used in the half duplex radio configuration. In the full duplex radio configuration any SATCOM ~/WSC-3(V) can be used for the receiver; however, an AN/WSC-3A or AN/WSC-3A(V) mus~ be used for the transmitter. 5-3.4.3 TD-1271B/U Multiplexer data to and from baseband equipment I/O Port Data Transfer. is discussed below. The transfer of

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5-3.4.3.1 Data Transfer 5aseband Equipment to TD-1271B/U. The ~ransfer of data from baseband equipment to the TD-1271B/U I/O port is inltlated by GND LEVEL KEY or ~MIT REQ. ~ne sequence of events is discussed below. a. The TD-1271B/U interprets GND LEVEL ,KEY (or XMIT REQ) as transmit request and will respond wir_h a TX ACK signal and a YX ACK LAMP status signal within five milliseconds. If the baseband equipment employs an ON-~43(V)/USQ (e.g., CUDIXS, FLTSAT NBSV), coincident with the generation GND LEVEL K~Y (or ~IT REQ), the IG will begin its transmit sequencing described in paragraph 5-4.2.1.4. If the baseband equipment is the TSEC/KW-7, the operator must act_irate the C-8657(P)/UG teletype transmitter control (autophaser) or press the phase button on the KWX-8/TSEC or TSEC/KW-7 which causes the TSEC/KW-7 to OUtpUt a synchronizar-ion (sync) signal. b. After the TD-~271B/U outputs the TX ACK LAMP signal, it will accept the crypto sync signal (from the TSEC/KG-36 or the TSEC/KW-7) and clock SERIA/~ INPUT DATA with OUTPUT CLOCK B (or INPUT CLOCK). The TD-1271B/U processes them for output during the next burst time slot assigned to the I/O port. 5-3.4.3.2 Data Transfer TD-1271B/U to Baseband Equipment. The transfer of data from the TD-%271B/U I/O port to the baseband equipment is initiated and controlled by.the TD-1271B/U. The sequence of events when a burst is received that contains data in a time slot assigned to the I/O port is discussed below. a. SIG ACQ goes from -6 VDC to +6 VDC. that may turn on a

receive

b. The TD-~271B/U outpur-s a SIG ACQ LAMP signal indicator in the connected baseband equipment.

c. The TD-127~B/U initiates its own internal processing which includes convolutional decoding, error detection/correction and conversion from The TD-1271B/U clocks OUTPUT DATA the burst rate to the I/0 port data rate. to baseband equipment with OUTPUT CLOCK A. SHORE USER TEP~MINAL EQUIPMENT DETAILED FUNCTIONAL DESCRIPTION, 5-4 INTERFACES. This section discusses user terminal equipment interfaces with the satellite terminal at the detailed level. These discussions cover major control signals and data flow. There is a table listing all signals and a figure diagramming interface signals for each user terminal equipment that interfaces with the satellite terminal. 5-4.1 FLTSATBCST USER TERMINAL EQUIPMENT INTERFACES. The FLTSATBCST user terminal interfaces are discussed in the following subparagraphs. Table 5-17 lists the signals that are discussed below; F0-57 diagrams interface signal flow. 5-4.1.1 Broadcast Control Stations (BCS). In normal operation at the BCS, the FLTSATBCST user terminals (i.e., Broadcast Keying Stations (BKS)) interface to the satellite terminal via the TD-1150/USC tlme division multiplexer. In fallback operation, the interface can be via the AN/FCC-67 (or equivalent) VFCT multiplexer.

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5-4.1.1.1 TD-II50/USC Functlonai interface Description. The TD-II50/USC receives up to 15 channels of 75-baud data from the BKSs (e.g., NAVCOMPARS, STREAMLINER and or/her sources) via cryptographic equipment. The TD-IIS0/USC generates a 16th channel containing a sync word (RYs) that may be monitored teletype or test equipment. The 16 channels are time division multiplexed and output to the AN/FSC-79(V), AN/WSC-5(V) or TD-1271B/U for transmission. signal is a 1,200-bps data stream at ~6 VDC. The TD-1150/USC also outputs a 1,200-Hz clock signal that may be used to clock the data stream into the satellite terminal. 5-4.1.1.2 AN/FCC-67 (or Equivalent) Functional Interface Description. In this fallback mode, the AN/FCC-67 recelves up to I 5 channels of 75-baud data from the BKSs (e.g., NAVCOMPARS, STREAMLINER and other sources) via cryptographic equipment. These 15 encrypted channels are frequency division multiplexed and output to the AN/WSC-5(V) for transmission; this is the same signal concurrently (and prlmarlly) used for HF FLTBCST. The signal is a 300 3,500-Hz tone package with a level of 0 dBm (nominal). The AN/WSC-5(V) interprets this signal as REMOTE DATA IN. 5-4.1.2 HF Rekey Stations. At HF Rekey Stations, minal (i.e., the HF transmission system) interfaces SSR-IA satellite signal receiving set. the FLTSATBCST user terto the AN/SSR-I or AN/

5-4.1.2.1 TD-1063/SSR-I or TD-1063A/SSR-I Functional Interface Description. The TD-1063/SSR-I or TD-1063A/SSR-I demultiplexer provides 15 parallel informar_ion data output channels at 75 baud. These 15 channels are output on 2 separate jacks (J2 and J3) with the output on J3 providing a 16th channel containing a sync word (RYs) that may be monitored on teletype or test equipment. The 16 channel outputs are capable of keying 20 to 120 milliampere neutral telegraph loops or, with the replacement of modules, the TD-1063A/SSR-I can drive low level interfaces at +7 VDC. The outpur_s are patchable to appropriate multiplexer equipment. The signals out of the TD-1063/SSR-I and the TD-1063A/SSR-I for a high level interface are a short (less than 150 ohms) for a mark and an open (over 100 kohms) for a space. The signals out of the TD-1063A/SSR-I for a l~ level interface are +6 VDC (mark) and -6 VDC (space), 5-4.1.2.2 MD-900/SSR-I Functional Interface Description. The MD-900/SSR-I combiner-demodulator operates in two modes: FM and PSK. When operating in the PSK mode, a 1,200-bps data stream is output to the TD-~063/SSR-I or the TD1063A/SSR-I for demultiplexing. When operating in the FM mode, the MD-900/ SSR-I outputs a 300 to 3,500-Hz tone package to HF transmitter equipment. The signal level of the tone package is -25 to +10 dBm into 600 ohms at 10-kHz peak deviation. 5-4.2 CUDIXS USER TERMINAL EQUIPMENT INTERFACES. The CUDIXS user terminal interfaces to the satellite terminal via either the ON-143(V)4/USQ ON-143(V)9/USQ. The following subparagraphs discuss the signals required for the interfaces through the ON-143(V)4/USQ and ON-143(V)9/USQ. 5-4.2.1 ON-143(V)4/USQ CUDIXS User Terminal Equipment Interfaces. The CUDIXS processor interfaces wlth the sa~ellite terminal via the ON-143(V)4/ USQ. The following subparagraphs discuss the signals required for this interface. Table 5-18 lists the signals that are discussed below; FO-59 diagrams interface signal flow.

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T

7

T

7

7

7

7

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5-4.2.].] AN/UYK-20(V) to ON-143(V)4/USQ Functional Interface DescriPtion. The AN/UYK-20(V) ~n~erfaces wlr/n the ON-143(V)4/USQ via a serial, synchronous i/0 channel (channel i3). The interface signals are discussed below. a. LINK ENABLE. LINK ENABLE is provided used by the IG to !nltiate transmit sequencing. transmit and -6 VDC when not in transmit. by the processor and is The signal is +6 VDC in

b. END RECEIVE. END RECEIVE is provided by the IG and used by the processor to determlne when valid RCV DATA and RCV CLOCK are present. The low-to-high transition of this signal occurs when the IG enables RCV CLOCK to the processor. The high-to-low transition occurs when RCV CLOCK is disabled or DATA MODE CHANNEL BUSY is low. The high-to-low transition generates an END RECEIVE interrupt to the processor. The signal levels of END RECEIVE are +6 VDC. c. XMT CLOCK. TRANSMIT CLOCK is gated on by the IG after the 115 millisecond and the 835 bit delay (at the clock rate) following a LINK ENABLE slgnal. The delay allows transmitter turn-on, frequency stabilization and the crypto synchronization sequence. The signal levels of ~,[T CLOCK are +6 VDC. XMT DATA. TRANSMIT DATA is shifted out of the processor on the transitlon of ~{T CLOCK. The signal levels of XMT DATA are

low-to-high +6 VDC.

the first ~6 VDCo

e. RC__~_V CLOCK. RECEIVE CLOCK is gated on by the IG in phase with data bi~ output from the IG. The signal levels of RCV CLOCK are

to-low

f. RCV DAT______~A. RECEIVE DATA is shifted out of the IG on the hightransition of RCV CLOCK. The signal levels of RCV DATA are +6 VDC.

g. ALARM INDICATE. ALARM INDICATE is generated by the crypto and routed through the IG to the processor. This signal generates a fault interrupt in the processor; it requires the processor to disable LINK ENABLE, if active, or to abort received message, if in receive. A voltage level of +6 VDC indicates a crypto fault and 0 VDC indicates this line is inactive. h. MIAR. MESSAGE INDICATE ALARM RESET is generated in the processor and routed through the IG to the crypto. MIAR is a 10-millisecond pulse that resets ~ne crypto in response to ALARM INDICATE or to a program determined loss of synchronization. A voltage level of 0 VDC resets the crypto and +6 VDC indicates this line is inactive. i. CHANNEL BUSY. CHANNEL BUSY is generated in the transceiver and routed through the IG to the processor. The low-to-high transition of this slgnal indicates tha~ the transceiver has acquired an RF signal. The high-tolow transition indicates loss of an acquired RF signal. The signal levels of CHANNEL BUSY are +6 VDC. 5-4.2.~.2 ON-]43(V)4/USQ to TSEC/KG-36 (or TSEC/KG-35) Functional Interface Description. The interface signals between the IG and the crypto are discussed below.

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EE 130-PL-OM1-020/~'; 142-UHFSATCOM

a. PREP. PREP is generated by the IG and applied to the crypto. PREP is a red control signal that is used by the crypto to place it in transmlt state. The signal is 0 VDC in transmit and approxlmately +6 VDC when not in transmit. b. GATED CLOCK (TRANSMIT MODE). This function applies when the

is in transmit. GATED CLOCK is a red signal XMT DATA into the crypto on the low-to-high signal levels of GATED CLOCK are +6 VDC.

gated by the crypto; it clocks transition of GATED CLOCK. The

c. GATED CLOCK (RECEIVE MODE). This function applies when the IG is in receive. GATED CLOCK is a red signal gated by the crypto; it clocks RCV DATA OUt of the crypto on the high-to-low transition of GATED CLOCK. The signal levels of GATED CLOCK are +6 VDC. d. XMT DATA (RED). TKANSMIT DATA is a red (unencrypted) digital data stream; it is clocked into the crypto by GATED CLOCK. The signal levels of XMT DATA are +6 VDC. e. RCV DATA (RED). RECEIVE DATA is a red (decrypted) digital stream; it is clocked out of the crypto by GATED CLOCK. The signal levels RCV DATA are +6 VDC.

of

f. ALARM INDICATE. ALARM INDICATE is generated by the crypto and applied to the IG. ALARM INDICATE is a red status signal that indicates the crypto is in an alarm state. The crypto does not output (black) XMT DATA when it is in the alarm state. To come out of the alarm state, the crypto must be commanded by MIAR to reset its alarm. A signal level of +6 VDC indicates that the crypto is in an alarm state; 0 VDC indicates that the crypto is not in an alarm state. g. MIAR. MESSAGE INDICATE ALARM RESET is a red control signal that is gated by the IG and applied to the crypto. MIAR is a 10-millisecond pulse that resets the crypto. The reset condition of this signal is 0 VDC and the normal state is +6 VOC. h. XMT/RCV CLOCK. TRANSMIT/KECEIVE CLOCK is a black clock signal that is generated in the IG. If an external clock is selected ~MT/RCV CLOCK is phase locked to XMT CLOCK in transmit and RCV CLOCK in receive. The signal levels of XMT/RCV CLOCK are +6 VDC. i. XMT DATA (BLACK). TRANSMIT DATA is a black (encrypted) digital data stream that is clocked out of the crypto by the low-to-high transition of XMT/RCV CLOCK. The signal levels of XMT DATA are +--6 VDCo ~MT DATA is +6 VDC when the crypto is not in transmit. j. RCV DATA (BLACK). RECEIVE DATA is a black (encrypted) digital data stream that is clocked into the crypto by the high-to-low transition of ~4T/RCV CLOCK. The signal levels of RCV DATA are +6 VDC. RCV DATA is +6 VDC when the crypto is not in receive. 5-4.2.1.3 ON-143(V)4/USQ to AN/WSC-5(V) Functional Interface Description. The interface signals between the IG and the transceiver are discussed below. AMENDMENT 0007 K - $6

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--E ] 30- PL-O:-I1-020 I 42-UHFSATC~.I ,~'~

a. DATA KEYLINE. DATA KEYLINE is used by the transceiver to place it in transmit. The signal is +6 VDC in transmit and -6 VDC when not in transmit. This signal is input to the transceiver as BASEBAND KEYLINE. b. ~4T CLOCK. TRANSMIT CLOCK is a black clock signal that is normally provided by the station clock, but can be provided by the transceiver or IG. It is used by the IG to clock ~~T DATA out of the IG. The signal levels of XMT CLOCK are +6 VOC. c. XMT DATA. TRANSMIT DATA is a black (encrypted) digital data that is clocked out of the IG on the low-to-high transition of XMT The signal levels of XMT DATA are +6 VOC.

stream CLOCK.

d. RCV CLOCK. RECEIVE CLOCK is a black clock signal that is generated by the transceiver; it is used by the IG to clock RCV DATA into the IG. The signal levels of RCV CLOCK are +6 VDC. e. RC____~V DAT_____A. RECEIVE DATA is a black (encrypted) digital data stream that is clocked out of the transceiver on the high-to-low transition of RCV CLOCK. The signal levels of RCV DATA are +6 VDC. f. DATA MODE CHANNEL BUSY. DATA MODE CHANNEL BUSY indicates that the transceiver is generating RCV DATA and RCV CLOCK. DATA MODE CHANNEL BUSY is a black control signal with signal levels of +6 VDC in receive and -6 VDC when idle. This signal is output from the transceiver as OUTPUT DATA TRANSFER LL. go DATA SIG ACQ IND. DATA SIGNAL ACQUIRED INDICATE is a black status signal that is generated in the transceiver; it is used by the IG to turn on the receive indicator lamp. DATA SIG ACQ IND is at ground in receive and open when idle. When open, +6 VDC is present (via the receive indicator lamp). This signal is output from the transceiver as OUTPUT DATA TRANSFER. h. GROUND IN TRANSMIT. GROUND IN TRANSMIT is a black status signal that is generated in the transceiver; it is used by the IG to turn on the transmit indicator lamp. GROUND IN TRANSMIT is at ground in transmit and open when idle. When open, +6 VDC is present (via the transmit indicator lamp). This signal is output from the transceiver as MODEM KEADY. 5-4.2.~.4 Transmit Se~,uence. The transmission of information through the ON-~43(V)4/USQ is initiated by the AN/UYK-20(V) providing LINK ENABLE to IG. This initiates the sequence of events discussed below. (Refer to Figure 5-2. ) a. The IG, upon sensing LINK ENABLE from the AN/UYK-20(V), provides DATA KEYLINE to the transceiver and ~~T/RCV CLOCK to the crypto (provided DATA MODE CHANNEL BUSY is idle). b. The IG then initiates an internal 115-millisecond time delay. This delay allows for transmitter turn-on and stabilization (40, +10 milliseconds) and, concurrently, the following crypto preparation sequence: (I) At 89 milliseconds into the 115-millisecond removes XMT/RCV CLOCK from the crypto, delay, the IG

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EE ~ 20-PL-OM1-020/W 142-UHFEATCOM

<2]

At £.6 m~iliseconds after orypto provldes PREP to the crypto,

clock

removal,

the

IG

(3)

Approximately 20 milliseconds after the PREP command, IG restores ~MT/RCV CLOCK to the crypto. enables the crypto to output

the

for receive

c. Crypto clock restoranion crypto synchronization. 834 bits have been

841 bits

d. After GATED CLOCK to the

counted

by ~he

crypto,

it restores

idue bits, crypto.

e. Upon receiving GATED CLOCK, the AN/UYK-20(V) then valid data (XMT DATA). The residue bits

outputs eight resare ignored by the

f. XMT DATA is routed the sa~elline termlnai.

through

the crypto

and black

IG interface

5-4.2.~.5 Receive Sequence. The reception of signals relayed by the satellite causes a snructured sequence that ensures valid data is output to the AN/UYK-20(V). The sequence of events is discussed below. (Refer to Figure 5-3. ) a. The transceiver demodulates a signal into RCV DATA. The transceiver provides a DATA MODE CHANNEL BUSY signal to the IG; the IG passes CHANNEL BUSY to the AN/UYK-20(V). b. At the same time, the IG provides ~,~T/RCV CLOCK to the crypto and RCV DATA is clocked into the crypto. The crypto removes GATED CLOCK from the IG until it receives 841 bits of preamble. c. The crypto, GATED CLOCK to the IG. having received 841 bits of preamble, restores

d. The IG wains three clock periods, valid data (RCV DATA) into the AN/UYK-20(V).

provides

RCV CLOCK

and clocks

MODE

e. When no more signal is received, the transceiver removes CHANNEL BUSY. The IG passes END RECEIVE to the AN/UYK-20(V). f. The terminal is now free to stay in receive or go

DATA

into

transmit. 5-4.2.2 ON-143(V)9/USQ CUDIXS User Terminal Equipment Interfaces. The CUDIXS processor interfaces with the satellite terminal via the ON-~43(V)9/ USQ. The following subparagraphs discuss the signals required for this interface. Table 5-19 lists the signals than are discussed below; FO-6~ diagrams interface signal flow. 5-4.2.2.% AN/UYK-20{V) =o ON-143(V)9/USQ Functional Interface Description. The AN/UYK-20(V) interfaces with the ON-143(V)9/USQ via a NTDS slow (-15 0 VDC) parallel I/0 channel, During ~he transition to DAMA, the AN/UYK-20(V) AMENDMENT 0007 K - 58

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RCV CLOCK

XMT CLOCK

DATA MODE CHANNELBUSY .6

DATAKEYLINE*

XMTDATA(BLACK)

.6 ,..j

XMTIRCVCLOCK

.8

dUUU

r~ r~r~r-

LINK ENASLEI PTT KEYLINE

PREP

GATEDCLOCK (XMT MODE) XMTDATA (RED)

* DATA KEYLINE also be ground in transmit, open whennot dependingon the transceiver used. may

Fiqure 5-2.

Transmit

Sequence

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RCV CLOCK

XMT CLOC~

DATA MODE CHANNEL BUSY

RCV DATA (BLACK)

LINK ENABLE/ Frr KEYLINE

PREP

GATED CLOCK (RCV MODE)

RCV DATA (RED) +e

END RECE|VE

Ffgure

5-3.

Receive

Sequence

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will ~nterface wl~h two ON-143(V)9/USQ's, one for non-DAMA opera~lon and one for D~4A operatlon. The non-DM.~ ON-143(V)9/USQ interfaces to the AN/UYK20(V) on channel 3 and the D~4A 0N-143(V)9/USQ interfaces on channel 7, Actuai da~a exchange is controlled by user system software. The interface signals are discussed below. a. EFR. (0 VDC) it indicates processor. EXTERNAL FUNCTION ~EQUEST is output by the IG. When that the IG is ready to accept a function word from set the

b. EFA. EXTERNA/~ FUNCTION ACK/qOWLEDGE is output by the processor. When set (0 VDC) it indicates that the processor has placed a function word the processor OUTPUT DATA (OD) lines. c. ODK. OUTPUT DATA KEQUEST (0 VDC) it indicates that the IG is ready cessor, d, ODA. OUTPUT DATA ACKNOWLEDGE set (0 VDC) it indicates that the processor cessor OD lines. e. OD. OUTPUT DATA is output is output by the IG. When set to accept a data word from the pro-

is output has placed

by the processor. When a data word on the pro-

from the processor

on 16 data

lines.

f. EIR. EXTERNAL INTERRUPT P~EQUEST is output by the IG. When set (0 VDC) it indicates that the IG has placed an interrupt word on the ~rocessor INPUT DATA (ID) lines. g. EIE. EXTEKNAL When set (0 VDC) it indicates rupt word from the IG. IDR. INPUT it indicates INTEKRUPT ENABLE is that the processor output by the processor. ready to accept an inter-

DATA P~EQUEST

is output

by the IG. When set (0 VDC) ID lines.

that the IG has placed

~ data word on the processor

i. IDA. INPUT set (0 VDC) it indicates processor ID l~nes. j. ID. INPUT

DATA ACKNOWLEDGE is output by the processor. When that the processor has sampled the data word on the

DATA is output

from the IG on ~6 data lines.

5-4.2.2.2 ON-143(V)9/USQ to TSEC/KG-36 (or TSKC/KG-35) Functional Interface Descrlption. The interface signals between the IG and the crypto are discussed below. a. PREP. PREP is generated by the IG and applied ~o the crypto. PREP is a red control signal that is used by the crypto to place it in transmit s~ate. The signal is 0 VDC in transmit and approxlma~eiy ~6 VDC when not in transmit, b. GATED CLOCK (TKANSMIT MODE). Th~s function applies when the IG is in transmit. GATED CLOCK is a red signal gated by the crypto that clocks X~4T DATA into the cryp~o on the low-to-high transition of GATED CLOCK. The signal levels of GATED CLOCK are +--6 VDC. AMENDMEI~rI"0007 K - 65

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c. GATED CLOCK (R£CEIVE MODE). This function applies when the IG is in receive. GATED CLOCK is a red signal gated by the crypto that clocks RCV DATA ou_t of the crypto on the high-to-low transition of GATED CLOCK. The signal levels of GATED CLOCK are +6 VDC.

d. XMT DATA (RED). TRANSMIT DATA is a red (unencrypted) digital data stream that is clocked into the crypto by GATED CLOCK. The signal levels of XMT DATA are +6 VDC. e. RCV DATA (RED). RECEIVE DATA is a red (decrypted) digital data stream that is clocked out of the crypto by GATED CLOCK. The signal levels of RCV DATA are +6 VDC. f. ALARM INDICATE. A~AB_M INDICATE is generated by the crypto and applied to the IG. ALARM INDICATE is a red status signal that indicates the crypto is in an alarm state. The crypto does not output (black) XMT DATA when it is in the alarm state. To come out of the alarm state, the crypto must be commanded by MIAR to reset its alarm. A signal level of +6 VDC indicates that the crypto is in an alarm state; 0 VDC indicates that the crypto is not in an alarm state. g. MIAR. MESSAGE INDICATE ALAKM RESET is a red control signal that is gated by the IG and applied to the crypto. MIAR is a 10-millisecond pulse that resets the crypto. The reset condition of this signal is 0 VDC and the normal state is +6 VDC. h. XMT/RCV CLOCK. TRANSMIT/RECEIVE CLOCK is a black clock signal that is generated in the IG. If an external clock is selected XMT/RCV CLOCK is phase locked to ~T CLOCK in transmit and RCV CLOCK in receive. The signal levels of ~T/RCV CLOCK are +6 VOC, i. XMT DATA (BLACK). TRANSMIT DATA is a black (encrypted) digital data stream that is clocked out of the crypto by the low-to-high transition of XMT/RCV CLOCK. The signal levels of XMT DATA are +6 VDC. XMT DATA is +6 VDC when the crypto is not in transmit. j. RCV DATA (BLACK). RECEIVE DATA is a black (encrypted) digital data stream that is clocked into the crypto by the high-to-low transition of XMT/RCV CLOCK. The signal levels of RCV DATA are +6 VDC. RCV DATA is +6 VDC when the crypto is not in receive. 5-4.2.2.3 interface ON-143(V)9/USQ to TD-1271B/U Functional Interface Description. signals between the IG and the multiplexer are discussed below. The

a. DATA KEYLINE. DATA KEYLINE is used by the multiplexer to key the I/O port. The signal is +6 VDC in transmit and -6 VDC when not in transmlt. This signal is input to the multiplexer as XMIT REQ. b. XMT CLOCK. T~ANSMIT CLOCK is a black clock signal that is normally provided by the station clock, but it can be provided by the multiplexer or IG. It is used by the IG to clock XMT DATA out of the IG. The signal levels of XMT CLOCK are +5 VDC or +6 VDC depending on the source. The signal is input to the multiplexer as INPUT CLOCK or output from the multiplexer as OUTPUT CLOCK B. AMENDMENT 0007

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c. XMT DATA. ?.~ANSMIT DATA Is a black (encrypted) digital data stream that is clocked out of the IG on the low-to-high transition of XMT CLOCK. The slgnal levels of ~4T DATA are +6 VDC. This signal is input to the multiplexer as SERIAL INPUT DATA. d. RCV CLOCK. ~ECEIVE CLOCK is a black clock signal that is generated by the mult/plexer; it is used by the IG to clock RCV DATA into the IG. The signal levels of RCV CLOCK are +5 VDC. The signal is output from the multiplexer as OUTPUT CLOCK A. e, RCV DATA. RECEIVE DATA is a black (encrypted) digital data steam that is clocked ou~ of the multiplexer on the high-to-low transition of RCV CLOCK. The signal levels of RCV DATA are +5 VOC. The signal is output from the multiplexer as OUTPUT DATA. f. DATA MODE CHANNEL BUSY. DATA MODE CHANNEL BUSY indicates that the mul~iplexer is generating RCV DATA and RCV CLOCK. DATA MODE CHANNEL BUSY is a black control signal with signal levels of +6 VDC when a burst is received with data present and -6 VDC when idle. The signal is output from the multiplexer as SIG ACQ. g. DATA SIG ACQ IND. DATA SIGNAL ACQUIRED INDICATE is a black status signal that is generated in the multiplexer; it is used by the IG to turn on the receive indicator lamp. DATA SIG ACQ IND is output from the multiplexer as SIG ACQ LAMP. The signal goes to a ground level when a burst with data present is received in the time slot associated with the i/O port; when no burst or burst with no data present is received, the signal remains open. When open, +6 VDC is present (via the receive indicator lamp). h. GROUND IN T~ANSMiT. GROUND IN TRANSMIT is a black status signal that is generated in the multiplexer; it is used by the IG to turn on the transmit indicator lamp. GROUND IN %~P~ANSMiT is output from the multiplexer as TX ACK LAMP. The signal goes to a ground level within five milliseconds after the receipt of DATA KEYLINE if the multiplexer is prepared to accept ~4T DATA. The slgnal is open any time the multiplexer is not prepared to accept data and when DATA KEYLINE is open. When open, +6 VDC is prasen~ (via the transmit indicator lamp). i. DATA SLOT TIME MARK. DATA SLOT T~4E MARK is a black status signal that is generated in the multiplexer; it is used by the IG to synchronize the timing of data transmission. ~The signal is generated once each 1.386 seconds. Normally at +6 VDC, DATA SLOT TIME MARK is a 5-millisecond pulse to -6 VDC with the transition back to +6 VDC coincident with DATA KEYLINE going to ground (if there is data to transmit). 5-4.2.2.4 ON-143(V)9/USQ to AN/WSC-5(V) FuncKional Interface Description. The interface s~gnals between the IG and the transceiver are discussed below. a. DATA F~EYLINE. DATA KEYLINE is used by the transceiver to place it in transmit. The slgnal is +6 VEK~ in transmit and -6 VDC when not in transmit. This signal is input to the tra/~sceiver as BASEBAND KEYLINE. b. XMT CLOCK. TRANSMIT CLOCK is a black clock signal that is normally provided by the s~atlon clock, but it can be provided by the transceiver

AMENDMENT 0007

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