Comtech EF Data SMS-758 User Manual
Page 11
SMS-758 Modem Protection Switch
Table of Contents
MN/SMS758 Rev. 3
vii
4.2 Modem Control Interface Specification..................................................................................................... 4–5
4.3 Relay-Remote Interface Specification........................................................................................................ 4–6
4.3.1 Command Structure................................................................................................................................ 4–6
4.4 Fault Interface Specification....................................................................................................................... 4–9
4.4.1 Controller fault ....................................................................................................................................... 4–9
4.4.2 M:N Fault ............................................................................................................................................... 4–9
4.4.3 Demodulator Signal Fault..................................................................................................................... 4–10
4.5 Online Status Specification ....................................................................................................................... 4–10
4.5.1 Modulator Online Status....................................................................................................................... 4–10
4.5.2 Demodulator Online Status .................................................................................................................. 4–10
4.6 Interface Switches...................................................................................................................................... 4–11
4.6.1 RS-422/449 and MIL-STD-188-114/RS-449 Interface Switch ............................................................ 4–11
4.6.1.1 Specification ................................................................................................................................. 4–11
4.6.1.2 Connector Pinouts ......................................................................................................................... 4–12
4.6.2 V.35 Interface Switch........................................................................................................................... 4–15
4.6.2.1 Specification ................................................................................................................................. 4–15
4.6.2.2 Connector Pinouts ......................................................................................................................... 4–16
4.6.3 V.35/RS-232 Interface Switch.............................................................................................................. 4–19
4.6.3.1 Electrical Specifications................................................................................................................ 4–20
4.6.3.2 Connector Pinouts ......................................................................................................................... 4–21
4.6.3.2.1 V.35 Option ........................................................................................................................... 4–21
4.6.3.2.2 RS-232 Option....................................................................................................................... 4–22
4.6.4 DS-1 and G.703 Interface Switch......................................................................................................... 4–25
4.6.4.1 Specification ................................................................................................................................. 4–26
4.6.4.2 Connector Pinouts ......................................................................................................................... 4–26
4.6.5 IDR Interface Switch ............................................................................................................................ 4–29
4.6.5.1 Specification ................................................................................................................................. 4–30
4.6.5.2 Connector Pinouts ......................................................................................................................... 4–30
4.6.6 2:N IDR Interface Switch (1877 and 1879).......................................................................................... 4–33
4.6.6.1 Specification ................................................................................................................................. 4–33
4.6.6.2 Operation ...................................................................................................................................... 4–34
4.6.6.3 Connector Pinouts ......................................................................................................................... 4–34
4.6.7 2:N IBS/ASYNC Interface Switch (1694 and 1695)............................................................................ 4–38
4.6.7.1 Specification ................................................................................................................................. 4–38
4.6.7.2 Operation ...................................................................................................................................... 4–39
4.6.7.3 Connector Pinouts ......................................................................................................................... 4–39
4.7 Address Decoder/Driver............................................................................................................................ 4–44
4.7.1 Specifications ....................................................................................................................................... 4–44
4.7.2 Theory of Operation ............................................................................................................................. 4–44
4.8 IF Switch Driver ........................................................................................................................................ 4–46
4.8.1 Specifications ....................................................................................................................................... 4–46
4.8.2 Theory of Operation ............................................................................................................................. 4–46