Comtech EF Data CRS-300 - Manual (Page 102)

CRS-300 1:10 Redundancy Switch MN/CRS300.IOM
Cables and Connections Revision 19
4–28
3) You may use the CRS-336 for single-port Ethernet Bridge Mode or HSSI, but not
both at the same time. The CRS-336 does not handle Sub-Mux operation (where
the CDM-625/A may use Ethernet Bridge Mode and EIA-530 simultaneously).
Sub-Mux operation is explained in the next section, Sect. 4.4.3.8.2 Ethernet Data
Connection – Wired-around Method (Sub-Mux).
4.4.3.8.2 Ethernet Data Connection – Wired-around Method (Sub-Mux)
While this redundancy approach is not recommended, you may use it once you
study the LAN and WAN sides of the IP networks.
Sub-Mux is a secondary framing structure which combines one to four ports of 10/100 Ethernet
(IP) traffic with any currently available combination of framing and interface type (i.e. HSSI, EIA-
422, ASI or G.703, but excluding IP itself). You must select a specific ratio in order to reference
the composite data rate (to the modulator and from the demodulator) to the primary, non-IP
data interface rate.
• Chapter 15. IP SUB-MUX in the CDM-625 Advanced Satellite Modem Installation
and Operation Manual (CEFD P/N MN-CDM625)
• Appendix N. IP SUB-MUX in the CDM-625A Advanced Satellite Modem
Installation and Operation Manual (CEFD P/N MN-CDM625A).
You must use the wired-around Ethernet connection with the CDM-625/A modem and Switch
when you use CDM-625/A Sub-Mux mode. When you configure Ethernet Bridge Mode for the
wired-around method, this gives full redundancy capability to both selected data types in Sub-
Mux mode. However, you must take care to ensure there are no Ethernet network loops or
connection problems – you should use this method only if the CDM-625/A will be using the Sub-
Mux. In general, you may use the wired-around approach in a hub-to-remotes configuration.
Figure 4-12 depicts the cabling example for a 1:N Redundant system with Traffic modems 3 and
9 configured for IP Sub-Mux. Do these steps when you use IP Sub-Mux with any other traffic
data type:
First, connect and secure the Control/Data Cable CA/WR0066 (for control/data purposes)
between the Redundant CDM-625/A and the Switch RMI (see Sect. 4.4.3.1).
Next, connect and secure the desired serial traffic data cables as described in Sects. 4.4.3.2
through 4.4.3.5.
Then, for each CDM-625/A using Sub-Mux, connect a user-provided CAT5 Ethernet data cable
from any one of the four 10/100 Ethernet Bridge Mode ports on the CDM-625/A to one port of a
user-provided 10/100/1000 Layer 2 Ethernet Switch.