Data Interface Connections Using Ip Sub-Mux; 4.2.4.10 Pmsi Interface Example - Comtech EF Data CRS-170A Installation And Operation Manual

CRS-170A L-Band 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/A Advanced Satellite Modem Installation and
Operation Manual (CEFD P/N MN-CDM625/A)
Sub-Mux is a secondary framing structure which combines one to four ports of 10/100 Ethernet
(IP) traffic – as shown in Figure 4-13 – with any currently available combination of framing and
interface type (excluding IP itself) – as shown in Figure 4-5 through Figure 4-12. The composite
data rate to the modulator and from the demodulator is referenced to the primary, non-IP data
interface rate by a specific, user-selected ratio.

4.2.4.10 PMSI Interface Example

The Pre-Mapped Symbol Interface (PMSI) is a function associated with DoubleTalk
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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
system where one device transmits, and the other device on the bus is configured to receive. See
Figure 4-15 to connect and secure the CDM-625/A Multi-drop CnC
(2X DB-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-170A L-Band
1:1 Redundancy Switch.
®
If CnC is enabled with a CDM-625/A 1:1 pair, before any switch configurations can be made,
specific configuration steps must be taken with each CDM-625/A to ensure proper operation of
the pair within a configured CRS-170A L-Band 1:1 Redundancy System.
Chapter 3. MODEM AND SWITCH CONFIGURATION
CEFD Part No.
CA-0000276
®
reference. The PMSI is an EIA-485 point-to-point bus
Qty Description
1 CDM-625/A Data Cable – Shielded, Multi-drop CnC
Figure 4-15. CDM-625/A PMSI 1:1 Example
4–15
Revision 10
MN/CRS170A.IOM
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Carrier-in-
®
Plus 1:1 Cable CA-0000276
Plus, 1:1, (2X) DB-9M, 1'
®