Specifications

SDM-300L3 Satellite Modem Revision 0
Specifications MN/SDM300L3.IOM
15–33
15.12.3 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)
< 100Ω, 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)
15.12.4 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 100Ω
E1 3V +0.3/-1.5V-pk into 120Ω
RD Amplitude
T1 3V +0.3/-1.5V-pk into 100Ω
E1 3V +0.3/-1.5V-pk into 120Ω
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)