Comtech EF Data CDM-500 User Manual
Page 9
Preface
CDM-500 Satellite Modem
iv
Rev. 1.3
6.10
UTIL (Utility) ............................................................................................................................................. 6–25
6.10.1
(UTIL) SET-RTC (Set real-time clock) ............................................................................................ 6–25
6.10.2
(UTIL) DISPLAY (Display brightness)............................................................................................ 6–25
6.10.3
(UTIL) MAN-1:1 (Manual 1:1 switchover) ...................................................................................... 6–25
6.10.4
(UTIL) RECENTER-BUF (re-center buffer) .................................................................................... 6–25
6.10.5
(UTIL) ID (Circuit ID)...................................................................................................................... 6–26
CHAPTER 7.
CLOCKING .........................................................................................7–1
7.1
Transmit Clocking........................................................................................................................................ 7–1
7.1.1
Internal Clock .......................................................................................................................................... 7–1
7.1.2
External Clock ......................................................................................................................................... 7–1
7.1.3
Loop-Timed............................................................................................................................................. 7–2
7.2
Receive Clocking .......................................................................................................................................... 7–2
7.2.1
Buffer Disabled ....................................................................................................................................... 7–2
7.2.2
Buffer Enabled, Rx=Tx ........................................................................................................................... 7–2
7.2.3
Buffer Enabled, Rx<>Tx ......................................................................................................................... 7–2
7.3
X.21 Notes ..................................................................................................................................................... 7–2
CHAPTER 8.
EDMAC CHANNEL .............................................................................8–1
8.1
Theory Of Operation ................................................................................................................................... 8–1
8.2
M&C Connection ......................................................................................................................................... 8–2
8.3
Setup Summary ............................................................................................................................................ 8–3
APPENDIX A.
SUMMARY OF SPECIFICATIONS .................................................... A–1
A.1
Modulator .....................................................................................................................................................A–1
A.2
Demodulator .................................................................................................................................................A–2
A.3
Data Interfaces..............................................................................................................................................A–3
A.4
Miscellaneous................................................................................................................................................A–3
A.5
Approvals ......................................................................................................................................................A–3
APPENDIX B.
REMOTE CONTROL.......................................................................... B–1
B.1
Introduction ..................................................................................................................................................B–1
B.2
EIA-485 .........................................................................................................................................................B–1
B.3
EIA-232 .........................................................................................................................................................B–2
B.4
Basic Protocol ...............................................................................................................................................B–2