Chapter 1: introduction, 1 scope, 2 purpose and function – Comtech EF Data SMS-758 User Manual
Page 17: Chapter 1. introduction
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MN/SMS758 Rev. 3
1–1
Chapter 1.
INTRODUCTION
1.1 Scope
This manual describes the SMS-758 modem protection switch (Figure 1-1), hereafter
called “the switch.”
The switch is a rack-mounted unit that provides independent backup control for
modulators and demodulators, or simultaneous modulator and demodulator (modem)
switching.
If a primary modem element failure occurs, the switch limits the loss of communication.
1.2 Purpose and Function
The switch is a fully automated, self-contained switching unit for many EFData satellite
data modems, including:
•
SDM-650B
•
SDM-308B
•
SDM-309B
•
SDM-8000
•
SDM-100
•
SLM-4650
•
SLM-8650
The switch, with one or two backup modems, provides redundancy for up to eight
primary modems.
The switch will automatically or manually switch one of two backup modulators online
to take the place of any of eight primary modulators. Also, one of two backup
demodulators may be switched online to receive any one of four possible downlinks.
- CDD-880 (124 pages)
- CDM-800 (130 pages)
- ODMR-840 (184 pages)
- CDM-750 (302 pages)
- CDM-840 (244 pages)
- SLM-5650A (420 pages)
- CTOG-250 (236 pages)
- CDM-700 (256 pages)
- CDM-760 (416 pages)
- CDM-710G (246 pages)
- CDM-600/600L (278 pages)
- CDMR-570L (512 pages)
- CDM-625 (684 pages)
- CDM-625A (756 pages)
- CDD-564A (240 pages)
- CDD-564L (254 pages)
- CLO-10 (134 pages)
- MCED-100 (96 pages)
- CDMR-570AL (618 pages)
- CDM-600 LDPC (2 pages)
- BUC Power Supply Ground Cable (2 pages)
- MPP70 Hardware Kit for CDM-570L (4 pages)
- MPP50 Hardware Kit for CDM-570L (4 pages)
- CDM-625 DC-AC Conversion (4 pages)
- CDM-625 DC-AC Conversion with IP Packet Processor (4 pages)
- DMDVR20 LBST Rev 1.1 (117 pages)
- DMD2050E (212 pages)
- DMD-2050 (342 pages)
- DMD1050 (188 pages)
- OM20 (220 pages)
- QAM256 (87 pages)
- DD240XR Rev Е (121 pages)
- MM200 ASI Field (5 pages)
- DM240-DVB (196 pages)
- MM200 (192 pages)
- CRS-150 (78 pages)
- CRS-280L (64 pages)
- CRS-170A (172 pages)
- CRS-180 (136 pages)
- SMS-301 (124 pages)
- CiM-25/8000 (186 pages)
- CiM-25 (26 pages)
- CRS-500 (218 pages)
- CRS-311 (196 pages)
- CIC-20 LVDS to HSSI (26 pages)