Comtech EF Data SNM-1001L - Manual (Page 26)

SNM-1001L Satellite Modem Revision 1
Introduction MN/SNM1001L.IOM
1–2
Refer to Figure 1-1 for a system block diagram.
M&C M&C
Remote Port
Alarm Relays
Fault Relays J7
J10
J6
J9
Data
Interface
Data
Interface
Tx Data
Tx Clock
ST Clock
Rx Data
Rx Clock
Demodulator
/ Decoder
Demodulator
/ Decoder
Encoder /
Modulator
Encoder /
Modulator
I/Q
Sat Clock
AGC
AUX 1 AUX 1
AUX 1
Control / Status
Tx IF
Ext Ref
Rx IF
CP1
CP2
CP3
Ref Osc Ref Osc Power
Supply
Power
Supply
Transmit
RF Equipment
Transmit
RF Equipment
LNB
LNB
SNM-1001L Satellite Modem
J8
User
Data
AUX 1
OC-TTL
Faults
Form C
Contacts
Remote
Port
AC Or
Optional
DC
Prime
Power
Note 1
Notes:
1) Tx IF (L-Band only) Outputs a 10 MHz
Reference and Optional ODU Voltage.
2) Rx IF Outputs LNB Voltage and 10 MHz
Reference.
Note 2
Opt ODU
Supply
Opt ODU
Supply
AC Only
Figure 1-1. Block Diagram
1.2 Options Summary
A summary of the available options for the unit is provided. Contact Comtech EF Data
Customer Support for upgrade information.
Option Description /Comment Availability Install Option
Single Data/Code Rate Yes FAST
Low Rate Variable ≤ 512 kbps Yes FAST
Full Rate Variable ≤ 5.0 Mbps Yes FAST
Offset QPSK Yes FAST
8-PSK Requires Viterbi, Reed-Solomon Codec.
Overhead card required for Open
Network. Yes User
TX/RX L-Band ± 0.02 ppm L-Band Modem with high stability
reference. Standard Factory
TX only, L-Band ± 0.02 ppm Hardware limited with high stability
reference. Yes Factory
RX only, L-Band ± 1.0 ppm Hardware limited with 1 ppm reference Yes Factory
TX/RX L-Band ± 1.0 ppm L-Band modem with 1 ppm reference Yes Factory
Sequential or Viterbi Codec Modem can be supplied with either:
Viterbi, Sequential Yes FAST
TX Reed-Solomon Codec Concatenates with Viterbi Yes User
RX Reed-Solomon Codec Concatenates with Viterbi Yes User