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CRS-180 70/140 MHz IF 1:1 Redundancy Switch
Cables and Connections
4.2.4.9.3
Data Interface Connections using IP Sub-Mux
Chapter 15. IP SUB‐MUX in CDM‐625 Advanced Satellite Modem Installation and
Operation Manual (CEFD P/N MN‐CDM625)
Sub‐Mux is a secondary framing structure which combines one to four ports of 10/100 Ethernet
(IP) traffic – as shown in Figure 4‐12 – with any currently available combination of framing and
interface type (excluding IP itself) – as shown in Figure 4‐4 through Figure 4‐11. The composite
data rate to the modulator and from the demodulator is referenced to the primary, non‐IP data
interface rate by a specific ratio selected by the user.
4.2.4.10 PMSI Interface Example
The Pre‐Mapped Symbol Interface (PMSI) is a function associated with DoubleTalk
®
®
Carrier
(CnC
) that permits the modulator in a selected unit to provide a direct copy of its output
(the outbound interferer) to the offline modem in a 1:1 pair. The offline modem will then take the
PMSI signal and use it for its own CnC
where one device transmits, and the other device on the bus is configured to receive. See Figure
4‐14 to connect and secure the CDM‐625 Multi‐drop CnC
9M, 1'), required between the Redundant Modem and each Traffic Modem using CnC.
The CA-0000276 Multi-Drop CnC PLUS 1:1 Cable bypasses the CRS-180 70/140
MHz IF 1:1 Redundancy Switch.
®
If CnC
is enabled with a CDM‐625 1:1 pair, before any switch configurations can be made,
specific configuration steps must be taken with each CDM‐625 to ensure proper operation of
the pair within a configured CRS‐180 1:1 Redundancy System.
Chapter 3. MODEM AND SWITCH CONFIGURATION
CEFD Part No.
CA-0000276
®
reference. The PMSI is an RS‐485 point‐to‐point bus system
Qty
Description
1
CDM-625 Data Cable – Shielded, Multi-drop CnC
Figure 4-14. CDM-625 PMSI 1:1 Example
®
Plus 1:1 Cable CA‐0000276 (2X DB‐
4–14
Revision 8
MN/CRS180.IOM
®
Carrier‐in‐
Plus, 1:1, (2X) DB-9M, 1'
®
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