Mocomtech CRS-300 - Manual (Page 90)

CRS-300 1:10 Redundancy Switch Revision 16
Cables and Connections MN/CRS300.IOM
4–30
NO TE
1. Where the traffic data type is Ethernet, the User can only use one of four
Ethernet ports, in Ethernet Bridge Mode, on the CDM-625 rear panel.
2. The CRS-316 can be used for single-port Ethernet Bridge Mode
or
EIA-530,
but not both at the same time . The CRS-316 does not handle Sub-Mux
operation (where the CDM-625 may use both Ethernet Bridge Mode and
EIA-530 simultaneously ). Sub-Mux operation is explained in the next
section, Sect. 4.5.3.8.2 Ethernet Data Connection – Wired-around Method
(Sub-Mux).
3. The CRS-336 can be used 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 may use both Ethernet Bridge Mode and EIA-530
simultaneously ). Sub-Mux operation is explained in the next section, Sect.
4.5.3.8.2 Ethernet Data Connection – Wired-around Method (Sub-Mux).
4.5.3.8.2 Ethernet Data Connection – Wired-around Method (Sub-Mux)
IM PORTAN T
While this redundancy approach is
not recommended, it can be
used after study of 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). 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.
For more information about Sub-Mux, refer to Chapter 15. IP SUB-MUX in the CDM-625
Advanced Satellite Modem Installation and Operation manual
.
Where the CDM-625 Sub-Mux mode will be used, the wired-around Ethernet connection is used
with the CDM-625 modem and CRS-300. With Ethernet Bridge Mode configured for the wired-
around method, this gives full redundancy capability to both selected data types in Sub-Mux
mode. However, care must be taken to ensure there are no Ethernet network loops or connection
problems – this method should only be used if the CDM-625 will be using the Sub-Mux. In
general, the wired-around approach can be used in a hub-to-remotes configuration.
Figure 4-13 depicts the cabling example for a 1:N Redundant system with Traffic modems 3 and 9
configured for IP Sub-Mux. When IP Sub-Mux is utilized with any other traffic data type, observe
the following:
• First, connect and secure the Control/Data Cable CA/WR0066 (for control/data
purposes) between the Redundant CDM-625 and the RMI (see Sect. 4.5.3.1).
• Next, connect and secure the desired serial traffic data cables as described in Sects. 4.4.3.2
through 4.5.3.5.
• Then, for each CDM-625 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 to one
port of a user-provided 10/100/1000 Layer 2 Ethernet Switch.