Comtech EF Data CRS-500, Installation And Operational Manual

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CRS-500 1:N Redundancy System
Revision 4
Cables and Connections 5–8 MN-CRS-500
5.3 Modem Connections
5.3.1 CDM-625/625A Modem Connections
Section Description
5.3.1.1 CDM-625/625A Cable Connection Considerations
5.3.1.2 Control Connections
5.3.1.3 Ethernet System Communication Connections
5.3.1.4.1.1 10/100 Ethernet Traffic Data Connections (Single-port Router Mode)
5.3.1.4.2 EIA-422 Traffic Data Connections
5.3.1.5 IF Cable Connections
5.3.1.6 CRS-500

CDM-625/625A User Data Interface Connections
5.3.1.7 Carrier-in-Carrier (CnC) Data Connections
5.3.1.1 CDM-625/625A Cable Connection Considerations
Chapter 3. CHECKLISTS
FOR
INITIAL START-UP
AND
CONFIGURATION
Read Chapter 3. CHECKLISTS
FOR
INITIAL START-UP
AND
CONFIGURATION . When adding a
CDM-625/625A Advanced Satellite Modem to an operating 1:N system:
•
Make sure the new modem does not interfere with existing traffic.
•
Make sure the cabling is correct.
•
Perform the power-up sequence correctly (see Section 5.5 Power Connections).
•
Make sure there is no system contention from the modem Tx carrier.
•
Four types of cables are used to connect the CRS-500 and the CDM-625/625A modems:
o
Control Cables
o
Ethernet System Communication Cables
o
Traffic Data Cables
o
IF Cables
The tables provided in Section 5.1.1 Configuration and Cable Connections Summary specify
the respective cables needed for each modem and data type. Figures in the chapter sections that
follow show examples of the various 1:N cable connections between the CRS-500 and the
CDM-625/625A modems. For clarity, these figures typically show a limited number of installed
Traffic Modems.
•
For user remote serial (EIA-232 or EIA-485) or Ethernet M&C communication, connect to
the CRS-500 CSU only. Do not connect directly to the Traffic or Redundant Modems.