Product specifications

CRS-180 70/140 MHz IF 1:1 Redundancy Switch MN/CRS180.IOM
Cables and Connections Revision 11
5–12
5.2.2.2 Modem-to-User IP (10/100 Ethernet) Interface Examples
5.2.2.2.1 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)
• Appendix N. IP SUB-MUX in CDM-625A Advanced Satellite Modem Installation
and Operation Manual (CEFD P/N MN-CDM625A)
Subsystem Multiplex – referred to by CEFD as Sub-Mux – is a secondary framing structure that
combines one to four ports of IP (10/100 Ethernet) traffic (see Figure 5-12) with any currently
available combination of framing and interface type (see Figure 5-4 through Figure 5-11) –
excluding IP itself. 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.
5.2.2.2.2 Managed Switch Mode (with/without Optional IP Packet
Processor)
Figure 5-12 shows the block diagram for the CDM-625/A 1:1 modem configuration using the IP
(10/100 Ethernet) Interface in Managed Switch (Ethernet Bridge) Mode. Figure 5-13 shows the
cabling example for this setup.
This configuration requires no cabling kit – you must use user-provided Ethernet cables and
Layer 2 switches for direct connection to the modem via one to four RJ-45 ports. This cabling
example shows use of all four Ethernet ports.
1) When in Managed Switch Mode with the Packet Processor either not installed or
installed but disabled
, all Ethernet ports on the Offline modem will be disabled.
The exception is if one of the ports has been set to be the Dedicated Management
Port.
See the CDM-625A or CDM625 Advanced Satellite Modem Installation and
Operation Manual (CEFD P/N MN-CDM625A or MN-CDM625) for instructions on
configuring one of the four 10/100 Ethernet ports as the Dedicated
Management Port for remote Ethernet M&C (Dedicated Management Port is
available only without the optional IP Packet Processor).
2) When in Managed Switch Mode with the optional IP Packet Processor installed
and enabled, only Port 1 of the Offline modem is enabled, while Ports 2, 3, and 4
on the Offline modem are disabled.
3) TO AVOID ETHERNET NETWORKING LOOPS – When in Managed Switch Mode and
using more than one Ethernet port, the ports must not be connected to the same
Layer 2 Switch unless they are isolated from one another. The ports can be isolated
by connecting each port to a separate Layer 2 Switch (see Figure 5-13) or by
configuring separate VLAN’s for each port on a single Layer 2 Switch.