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CRS-180 70/140 MHz IF 1:1 Redundancy Switch
Cables and Connections
5.2.2.3
PMSI Interface Example
The Pre-Mapped Symbol Interface (PMSI) is an EIA-485 point-to-point bus system where one
device transmits, and the other device on the bus is configured to receive. It is a function
associated with DoubleTalk
unit to provide a direct copy of its output (the outbound interferer) to the offline modem in a
1:1 pair. The offline modem then takes the PMSI signal and uses it for its own CnC
You must take specific configuration steps to enable CnC
you can make any switch configurations, This ensures proper operation of the pair within a
configured CRS-180 1:1 Redundancy System.
Chapter 4. MODEM
Use of PMSI requires that you connect and secure the CDM-625/A Multi-drop CnC
Cable CA-0000276 (2X DB-9M, 1') between the Redundant Modem and the Traffic Modem using
CnC. See Figure 5-16.
The CA-0000276 Multi-Drop CnC PLUS 1:1 Cable bypasses the CRS-180 L-Band 1:1
Redundancy Switch.
CEFD P/N
CA-0000276
®
Carrier-in-Carrier
SWITCH CONFIGURATION
AND
Qty
Description
1
CDM-625/A Data Cable – Shielded, Multi-drop CnC
Figure 5-16. CDM-625/A PMSI 1:1 Example
5–17
®
®
(CnC
) that permits the modulator in a selected
®
in your CDM-625/A 1:1 pair before
®
MN/CRS180.IOM
Revision 11
®
reference.
®
Plus 1:1
Plus, 1:1, (2X) DB-9M, 1'
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