Specifications

Options SDM-100A Satellite Modem
B–18 Rev. 0
B.2.3 Specifications
Voice Encoding
Audio Encoding CCITT G.711 and G.721 PCM or ADPCM
Audio Encoding Rate 64, 32, or 16 kbit/s (user-selectable)
Audio Encoding Type
CCITT G.711 A-Law or µ-Law (user-selectable)
Voice Interface
Audio Interface Type
600Ω Transformer Balanced 4-Wire 2-Wire E&M Signaling
E&M Signaling Types 1 to 5 (user-selectable)
Audio Input Level -20 to +10 dBm for 0 dBm0, in 1 dB steps
Audio Output Level -20 to +10 dBm for 0 dBm0, in 1 dB steps
Filtering 300 to 3400 Hz Input and Output
Mechanical
RJ11
Pin # Name
1 +TX
2 -TX
3 +RX
4 -RX
5 E
6 M
With Protection
Switch Jumper on
Data
With Protection
Switch Jumper on
ADPCM
Signal Function Pin # Name Name
SIGNAL GROUND 1, 19, 20, 27 SG
SEND DATA 4
22
SD-A
SD-B
SEND TIMING 5
23
ST-A
ST-B
RECEIVE DATA 6
24
RD-A
RD-B
REQUEST TO SEND 7
25
RS-A (see Note below)
RS-B
(see Note below)
-TX
+TX
RECEIVER TIMING 8
26
RT-A
RT-B
CLEAR TO SEND 9
27
CS-A (see Note below)
CS-B
(see Note below)
DATA MODE 11
29
DM-A
DM-B
-RX
+RX
RECEIVER READY 13
31
RR-A
RR-B
E
M
TERMINAL TIMING 17
35
TT-A
TT-B
MOD FAULT 3 -
DEMOD FAULT 21 -
MASTER CLOCK 16
34
MC-A
MC-B
Note: The Request to Send and Clear to Send lines are jumpered together on the
Demodulator/M&C card (AS/4973), since the modem does not support polled
operation.