T-722 X-Band

T - 722 X - B and
400 Mbps OQPSK Transmitter with AES Encryption and Reed-Solomon Encoding
Clock & Data Interface - The unit accepts
primary and secondary data and
clock inputs on a parallel Low Voltage
Differential Signaling (LVDS) interface.
The parallel data interface consists of
4 bit words at up to 50 Mbps each for
both the I and Q channels. There are
two encrypt/plaintext control inputs
to provide a real time cryptographic
bypass permitting frame headers to
be transmitted unencrypted. LVDS
outputs include reference data clock
allowing for synchronization to other
equipment and a RS enable used for
flow control. Data processing options
include Advanced Encryption Standard
(128/256-bit), Reed-Solomon with a 1
Mbyte FIFO buffer used to absorb RS
parity data growth, PN randomization,
and differential coding.
Modulator - Data is Offset Quadrature
Phase Shift Key (OQPSK) modulated
onto an X-Band carrier using a modulator with phase balance < 4°, amplitude balance < 0.75 dB p-p, and > 30
dBc carrier suppression.
SSPA - Modularized high efficiency XBand gain stages implemented with
GaAs FET technology are cascaded to
provide an output power of 7.5 Watts
at the highest RF power control setting.
RF output power is variable via on orbit
command in 0.5 dB steps.
Carrier Generation - The carrier is
internally generated with less than 2°
RMS phase noise over all operating
environments.
Information Security - Embedded AES
(NIST validated to FIPS 140-2) encryption
offers the user information security via
an algorithm that is accepted worldwide
for
secure
information
encoding
from electronic mail to ATM personal
identification numbers. The user has
the option of having the AES algorithm
configured for a 128 bit or 256 bit key.
Secure Performance
The L-3 Communications Cincinnati Electronics model T-722 is a
high data rate Offset Quadriphase Shift Keyed (OQPSK) transmitter
designed for use on spacecraft and satellites with large payload data
requirements. Transmit data rates as high as 400 Mbps are OQPSK
modulated and amplified to 7.5 Watts output power. This unit also
provides embedded AES (Advanced Encryption Standard) and ReedSolomon encoding.
T-722 Characteristics
Input Characteristics
Data I and Q (4 Bit Words)
LVDS
Clock I and Q
LVDS
Data Valid
LVDS
Encrypt/PT
LVDS
Tx PWR On/Off Cmd
28V Pulsed CMD
Primary/Secondary Cmd
Bi-Level
AES Encrypt/Bypass Cmd
Bi-Level
Serial CMDs
Open Collector
- Reed-Solomon Encode/Bypass
- Randomize Encode/Bypass
- Playback Enable (Data)/Disable (PN)
- NRZ-L to M Encode/Bypass
- RF Power Adjust
- AES Key Upload
Operating Modes
OQPSK (200 Mbps per channel)
- I Data and Clock
- 4 bit word (50 Mbps)
- Q Data and Clock
- 4 bit word (50 Mbps)
Internally Generated Pseudorandom Test Pattern
Power Requirements
Input Voltage
Input Power
+28 +/- 7 Vdc
75 Watts (max.)
Radiation
Total Dose
Latch-up
60 krad minimum
Immune
Environmental Specifications
Temperature
Vibration
-30°C to +70°C (non-operating)
-20°C to +65°C (operating)
Random; 14.1 grms, 3-axis
Physical
Footprint
Weight
6.8” (W) x 6.1” (D) x 4.75” (H)
8.5 lbs.
X-Band Transmitter - Mechanical Outline
Connectors
RF- Female SMA according to MIL-C-39012
9 pin Filtered D-Sub for Power
15 pin High Density D-Sub for Telemetry
15 pin D-Sub for Command and Telemetry
44 pin High Density D-Sub for Primary Signals
44 pin High Density D-Sub for Secondary Signals
Output Characteristics
RF Out
RF Frequency
Frequency Source
7.5 Watts
(adjustable in 0.5 dB
increments)
X-Band, 8.0 to 8.4 GHz
(selectable; factory preset)
Low Phase Noise Internal
TCXO
0-5V Analog
0-5V Analog
Thermistor
Open Collector
RF Power TLM
Secondary V TLM
Temperature TLM
Serial TLMs
- Primary/Secondary
- Reed-Solomon Encode/Bypass
- Randomize Encode/Bypass
- Playback Enable/Disable
- NRZ-L to M Encode/Bypass
Reproduced Clock (I and Q)
LVDS
RS Enable
LVDS
Space Electronics ~ 7500 Innovation Way ~ Mason, Ohio 45040-9699 U.S.A.
Tel: 1-513-573-6994 ~ Fax: 513-573-6767 ~ Visit our web site at www.L-3com.com/CE~ e-mail: SpaceMarketing.CE@L-3Com.com
Cleared by DOD/OSR for public release under 07-S-1073 on June 11, 2007