Comtech EF Data SNM-1000 - Manual (Page 24)

SNM-1000 Node Control Modem Revision 3
Introduction MN/SNM1000.IOM
1-4
1.2 Description
The SNM-1000 is housed in a 1-Rack Unit (1RU) rack-mountable chassis. Cooling is
provided by a fan mounted on the rear panel. The SNM-1000 operates in burst transmit
with continuous receive mode.
• Burst mode is used by the SNM-1000 to transmit to the NMS over the inbound
control channel. The burst mode data rate is shown below.
Burst Mode Data Rates
19.2 kbit/s at FEC rate 1/2 QPSK
• Continuous mode is used to receive the outbound control channel at the remote.
The continuous mode data rate is shown below.
Continuous Mode Data Rates
19.2 kbit/s Viterbi rate 1/2 QPSK
Figure 1-2. SNM-1000 Block Diagram