Async Interface Specifications - Comtech EF Data SDM-650B Installation And Operation Manual

SDM-650B Satellite Modem
F.3 ASYNC Interface Specifications
Physical Interface
Factory Option
Data Rates
G.703 Data Rates
Jumper Selectable
G.703 Line Code
Transmit Clock Reference
Jitter Attenuation
Pulse Mask
Overhead Rate
ASYNC Channel Rate (max.)
ASYNC Channel Interface
Connector
Baud Rates, Asynchronous
Asynchronous Format
Buffer Size
Buffer Fill Status
Buffer Centering
Buffer Clock Reference
External Clock Amplitude
External Clock Frequency
External Clock Impedance
External Clock Input Type
Rev. 5
Main Channel
MIL-STD-188-144
RS-422/-449
V.35
G.703
9.6K, 19.2K, 32 k/bits to 8.448 Mbit/s, in 32 k/bits steps
1.544 Mbit/s
2.048 Mbit/s
6.312 Mbit/s
8.448 Mbit/s
AMI, B8ZS, B6ZS, HDB3
Internal modem reference or external transmit clock (SCT or
TT)
Per G.703
Per G.703
Overhead Channel
16/15 of main channel
< 1.875% of main channel
RS-232-C
2-wire RS-485 half-duplex
4-wire RS-485 full-duplex
25-pin D on breakout panel
110, 150, 300, 600, 1200, 2400, 4800, 9600, 19200,
38400 bit/s
5, 6, 7, or 8 data bits
Even, Odd, or no parity
1 or 2 stop bits (1 or 1.5 for 5 bit)
Pleisiochronous Buffer Specifications
384 to 262144 bits, in 16-bit steps
Monitored accurate to ± 1%
Automatic or Manual
Transmit
Internal (10 Stability)
-5
External
Receive (Buffer Bypass)
Differential, 0.5 to 5 Vp-p
Common Mode, 0 to 5 VDC
256 to 2048 kHz, in 64 kHz steps
100 Ω
Sine or square wave
50%, ± 10%
Asynchronous Overhead Channel Unit
F–9