Table of Contents
Advertisement
M&C and Interfaces
Circuit Supported
Amplitude (RD, RTS)
Amplitude (TD, DSR, CTS)
Impedance
Baud Rate
Circuit Supported
Amplitude (RD,RT,ST,DM,RR)
Impedance (RD,RT,ST,DM,RR)
Impedance (SD,TT,MC)
Phasing (RD,RT)
Symmetry (ST,TT,RT)
Frequency Stability (ST)
Circuit Supported
Amplitude (RD,SCR,SCT,SD,SCTE)
Amplitude (CTS,DSR,RLSD)
Impedance (RD,SCR,SCT)
Impedance (SD,SCTE)
Impedance (RTS)
DC Offset (RD,SCR,SCT)
Polarity (SD,SCT,SCTE,RD,SCR)
Polarity (RTS,CTS,DSR,RLSD)
Phasing (SCTE,SCR)
Symmetry (SCT,SCTE,SCR)
Frequency Stability (SCT)
Composite Data Rates Supported
Primary Data Circuits Supported
Interface Type
Data Rate
Pulse Width
SD Amplitude
RD Amplitude
Pulse Mask
Line Code
Jitter Attenuation
4-4–16
RS-232 Specification
RD, TD, DSR, RTS, CTS
True: 14 V ± 11 V
False: -14 V ± 11 V
True: 11 V ± 2 V
False: -11 V ± 2 V
5000 ± 2000 ! <2500pF
Max: 1/2000 times the data rate
(Refer to Section 2.1.5 for details)
RS422 Specification
SD, ST, TT, RD, RT, DM, RR, MC
4 ± 2 V differential into 100 !
Less than 100 !, differential
100 ± 20 !, differential
Polarity True when B positive wrt A
False when A positive wrt B
False to True transition of RT nominally in center
of RD data bit.
50% ± 5%
± 100 ppm
V.35 Specification
SD, SCT, SCTE, RD, SCR, DSR, RLSD, MC
.55 V pk ± 20% differential, into 100 !
10 ± 5 V into 5000 ± 2000 !
100 ± 20 !, differential
100 ± 10 !, differential
5000 ± 2000 !, <2500 pf
± .6 V max, 1000 ohm termination to ground
True when B positive wrt A False when A
positive wrt B
True when <-3V wrt ground
False when >+3V wrt ground
False to True transition nominally in center of
data bit.
50% ± 5%
± 100 ppm
G.703 Specification
1544 Kb/s 2048 Kb/s
T1 - SD,RD E1 - SD,RD
Transformer Coupled Symmetrical Pair
T1 - 1544 Kb/s ± 100 b/s
E1 - 2048 Kb/s ± 130 b/s
T1 - 324 ± 50 nsec
E1 - 244 ± 25 nsec
T1 - 3 +.3/- 1.5 V pk into 100 !
E1 - 3 +.3/- 1.5 V pk into 120 !
T1 - 3 ± .3 V pk into 100 !
E1 - 3 ± .3 V pk into 120 !
T1 - G.703.2
E1 - G.703.6
Selectable AMI, B6ZS, B8ZS, or HDB3
T1 - per AT&T 43802
T1 - per CCITT G.824
E1 - per CCITT G.823
SDM-309B Satellite Modem
MN/U-SDM309B Rev. #
Advertisement
Table of Contents
