Comtech EF Data SDM-300A - Manual (Page 386)

SDM-300A Satellite Modem Revision 6
Specifications MN/SDM300A.IOM
19–30
19.9.4 EIA-422/EIA-449 MIL-188-114A Specification
EIA-422/EIA-449 MIL-188-114A Specification
Circuit Supported SD, ST, TT, RD, RT, DM, RR, RS, CS, MC
Amplitude (RD, RT, ST, DM, RR) ± 2V differential into 100Ω
Impedance (RD, RT, ST, DM,
RR) Less than 100 Ω, differential
Impedance (SD, TT, MC) 4k Ω
True when B is positive with respect to A
False when A is positive with respect to B
Phasing (RD, RT) False-to-true transition of RT nominally in center of RD
data bit
Symmetry (ST, TT, RT) 50%, ± 5%
Circuit Assignments
SD-A, SD-B Send Data
ST-A, ST-B Send Timing
RD-A, RD-B Receive Data
RS-A, RS-B Request to Send
RT-A, RT-B Receive Timing
CS-A, CS-B Clear to Send
DM-A, DM-B Data Mode
RR-A, RR-B Receiver Ready
TT-A, TT-B Terminal Timing
MC-A, MC-B Master Clock
MF Mod Fault (ttl)
DF Demod Fault (ttl)