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SDM-309B Satellite Modem
TERRESTRIAL TX DATA
ENGINEERING SERVICE CHANNEL
RS-422/V.35 RECEIVE TIMING
RS-422/V.35 TRANSMIT TIMING
RS422/V.35 TERMINAL TIMING
RS422 TRANSMIT OCTET
RS422 RECEIVE OCTET
RS422/V.35 REQUEST TO SEND
V.35 DATA SET READY
RS422/V.35 CLEAR TO SEND
RS422/V.35 DATA SET READY
RS422/V.35 RECEIVER READY
PRIMARY ALARM OUT
SECONDARY ALARM OUT
MODULATOR FAULT
DEMODULATOR FAULT
4.2.1.8 IBS Interface Specification
Transmit Clock Reference
Buffer Clock Reference
Modulator Fault
Demodulator Fault
External Clock Characteristics
Earth Station to Earth Station Channel
MN/U-SDM309B Rev. #
TERESTXDAT
RXESCDAT
SCR/RTA
SCR/RTB
SCT/STA
SCT/STB
SCTE/TTA
SCTE/TTB
R422TXOA
R422TXOA
R422RXOA
R422RXOB
RTSA
RTSB
V.35_DSR
CTSA
CTSB
DSR/DMA
DSR/DMB
RRA/RLSD
RRB/RLSD
PRI_COM
PRI_NO
PRI_NC
SEC_COM
SEC_NO
SEC_NC
MOD_FLT
DEM_FLT
Common Interface Specifications
TX_Terrestrial (derived from TT, SCTE, or SD)
Internal (10
(differential receiver)
TX_Terrestrial (derived from TT, SCTE, or SD)
Satellite (bypass) External Reference (differential
receiver) Internal (10
Open collector output
15 V max
20 mA max current sink
Fault is open circuit
Open collector output
15 V max
20 mA max current sink
Fault is open circuit
Amplitude: Differential .5 - 5 V p-p
Common Mode 0 - 2.5 VDC
Frequency: 8 KHz to 10 MHz, in 8 KHz Steps
Impedance: 100 !
Waveshape: Sine or Square
Duty Cycle: 50 ± 10%
RS-232 TD, RD, DSR, RTS, CTS
Asynchronously sampled at 1/512 of the primary
channel data rate for a usable data rate equal to
1/2000 of the primary channel data rate.
M&C and Interfaces
5
7
23
24
21
22
12
13
14
15
8
9
45
29
41
47
31
48
32
46
30
10
43
27
11
44
28
49
33
-5
accuracy) External Reference
-5
accuracy)
4-4–15
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