Comtech EF Data SDM-300L3 - Manual (Page 339)

SDM-300L3 Satellite Modem Revision 0
Specifications MN/SDM300L3.IOM
14–33
14.12.3 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 100 Ω
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)
14.12.4 Optional G.703 with ASYNC (Requires optional Overhead Card)
ASYNC: See ASYNC Specifications.
Primary Data Circuits Supported T1 SD, RD
E1 SD, RD
Interface Type Transformer coupled symmetrical pair
Data Rates T1 1544 kbps, ± 100 bit/s
E1 2048 kbps, ± 130 bit/s
Pulse Width T1 324, ± 50 Ns
E1 244, ± 25 Ns
SD Amplitude T1 3V +0.3/-1.5V-pk into 100 Ω
E1 3V +0.3/-1.5V-pk into 120 Ω
RD Amplitude T1 3V +0.3/-1.5V-pk into 100 Ω
E1 3V +0.3/-1.5V-pk into 120 Ω
Pulse Mask T1 G.703.2
E1 G.703.6
Jitter Attenuation T1 G.824
E1 G.823
Line Code AMI (T1 or E1)
B8ZS (T1 only)
HDB3 (E1 only)