Comtech EF Data SNM-1010L User Manual
Page 27
SNM-1010L Data/Control Modem
Revision 0
Introduction
MN/SNM1010L.OM
Continuous Mode (Node Control):
RX Data Rate
19.2 kbps
Demodulation QPSK,
R=1/2
Forward Error Correction
Viterbi, K=7, R=1/2
Burst Mode (Node Control):
TX Data Rate
19.2 kbps
Modulation QPSK,
R=1/2
Forward Error Correction
Viterbi, K=7, R=1/2
Call Setup/Termination (between two SNM-1010L units):
Typical Setup Time
< 10 seconds
Typical Teardown Time
< 30 seconds
Control Channel Format:
Outbound (from NMS)
Continuous transmission, Time Division Multiplex (TDM), 19.2 kbps, QPSK,
R=1/2
Inbound (to NMS)
Burst transmission, Slotted Aloha, 19.2 kbs, QPSK, R=1/2
Data Interface:
Digital Interface
EIA-232, EIA-422, and V.35 (25-pin D)
Signaling
RTS/DTR Transition initiates call request under software control
User Port Interface:
Interface Type
EIA-232
Data Rate
19.2 kbps
Application
Circuit initiation and termination via command interface.
TX and RX service terminal messages.
DAC software upgrades.
1–7