Specifications

Configuration SDM-650B Satellite Modem
3–38 Rev. 5
3.2.5.8 Asynchronous Interface Specifications
Main Channel
Physical Interface MIL-STD-188-114.
(Factory Option) RS-422/-449.
V.35.
G.703.
Data Rates 9.6K, 19.2K, 32 kbit/s to 8.448 Mbit/s.
G.703 Data Rates 1.544 Mbit/s.
(Jumper Selectable) 2.048 Mbit/s.
6.312 Mbit/s.
8.448 Mbit/s.
G.703 Line Code AMI, B8ZS, B6ZS, HDB3.
Transmit Clock Reference Internal modem reference or external transmit clock
(SCT or TT).
Jitter Attenuation Per G.703.
Pulse Mask Per G.703.
Overhead Channel
Overhead Rate 16/15 of main channel.
ASYNC Channel Rate (max.) < 1.875% of main channel.
ASYNC Channel Interface RS-232-C.
2-wire RS-485 half-duplex.
4-wire RS-485 full-duplex.
Connector 25-pin D on breakout panel.
Baud Rates, Asynchronous 110, 150, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400
bit/s.
Asynchronous Format 5, 6, 7, or 8 data bits.
Even, Odd, or No Parity.
1 or 2 stop bits (1 or 1.5 for 5 bit).
Buffer Specifications (Pleisiochronous/Buffer Operation)
Buffer Size 384 to 262144 bits, in 16-bit steps.
Buffer Fill Status
Monitored accurate to ± 1%.
Buffer Centering Automatic or Manual.
Buffer Clock Reference Transmit.
Internal (10
-5
Stability).
External.
Receive (Buffer Bypass).
External Clock Amplitude Differential 0.5 to 5 Vp-p.
Unbalanced Mode 0 to 5 VDC.
External Clock Frequency 256 to 2048 kHz, in 64 kHz steps.
External Clock Impedance
100Ω.
External Clock Input Type Sine or Square wave.
50%, ± 10%.