Comtech EF Data SNM-1001L - Manual (Page 268)

SNM-1001L Satellite Modem Revision 1
Specifications MN/SNM1001L.IOM
A–30
A.12.3 EIA-449/EIA-422 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) < 100 Ω, differential
Impedance (SD, TT, MC) 4k Ω
1 / Mark / OFF (True) when B is positive with respect to A
0 / Space / ON (False) when A is positive with respect to B
Phasing (RD, RT) 0 to 1 (False-to-true) transition of RT nominally in center of RD
data bit
Symmetry (ST, TT, RT) 50% ± 5%
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)