Comtech EF Data SNM-1000 - Manual (Page 27)

SNM-1000 Node Control Modem Revision 3
Introduction MN/SNM1000.IOM
1-7
Table 1-1. General Specifications (Continued)
Demodulator
Input Power:
Desired Carrier
Maximum Composite
-30 to –55 dBm
-5 dBm or +40 dBc
Input Impedance 75
Ω (Optional: 50Ω)
Input Return Loss > 20 dB
Carrier Acquisition Range
± 35 kHz from 100 Hz to 35 kHz, in 1 Hz steps
Acquisition Time: 19.2 bps, R=1/2 < 2 seconds
Sweep Reacquisition 0 to 999 seconds, in 1 second steps
Data Clock Internal, External, Transmit, Recovered RX
Outbound (from NMS) Continuous transmission, Time Division Multiplex
(TDM), 19.2 kbps, QPSK, R=1/2
Inbound (to NMS) Burst transmission, (TDMA) Slotted Aloha,
19.2 kbps, QPSK, R=1/2
Processor
M&C Processor
Single processor for node control EEPROM variable
storage Memory life without power for 10 years.
User Port Interface
Interface Type
EIA-232
Data Rate 19.2 kbps
Data Bits 8
Parity None
Stop Bits 1
Application Remote circuit initiation and termination via command
interface; Transmits and receives service terminal
messages.
Control Interface
EFBUS1:
Interface Type
EIA-485
Data Rate 9.6 or 19.2 kbps
Application Multi-drop bus used to control external data traffic
modems
Compatibility Standard Comtech EF Data remote commands
Modems Supported
(Not limited to-) SDM-100, SDM-300/300A, SDM-2020M/D,
SDM-6000, SDM-8000, SDM-9000, CDM-550/550T,
CDM-600, CiM-550