Comtech EF Data CDD-562L - Manual (Page 63)

CDD-562L/564 Demodulator with IP Module Revision 2
IP Module Ethernet Interface MN/CDD564L.IOM
4–7
4.4 Typical IP Module Operational Setups
The CDD-56X has several modes of operation. The typical setup examples that follow serve as a
means to determine the best mode of operation for the appropriate network topology and Ethernet
traffic environment.
4.4.1 IP Module Working Modes
Typical CDM-IP modems support two Working Modes: Managed Switch Mode (formerly
easyConnect
™) and Router Mode; however, the demodulator only supports Router Mode, so
the CDM-IP modem that is transmitting to demodulator must be in Router Mode. Non-IP
traffic is not supported in Router Mode.
Router Mode supports three HDLC Addressing Modes: Point-to-Point, Small Network, and Large
Network. Separate HDLC Modes allow the user to minimize the HDLC overhead transmitted
over the satellite based on the size of their network.
In Router/Point-to-Point Mode, no HDLC address is transmitted, Router/Small Network transmits
1 byte, and Router/Large Network transmits 2 bytes as part of HDLC header for each packet.
In the sections that follow, the functionality of these modes is described in further detail, in order
to optimize the Comtech EF Data IP modems in the network, based upon Network Topology and
Ethernet Traffic requirements.
1. The demodulator only supports Router Mode, so the CDM-IP modem that is
transmitting to demodulator must be in Router Mode.
2. The HDLC Address Mode of the Comtech EF Data IP modems must be
identical to pass traffic between the TX modems and the demodulator.
3. Changing the HDLC Address Mode of the demodulator requires the IP
Module to be rebooted. Before the user can select a different mode, the
demodulator will notify the user that changing the mode will require a reboot.
Working Mode
HDLC Address Mode
Network Topology Ethernet Traffic
Router Mode
Point-to-Point Point-to-Point only
Both sites on different LAN subnet
IP v4 only
Router Mode
Small Network Point-to-Point or Point-to-Multipoint (up to 254 sites)
All sites on different LAN subnet
IP v4 only
Router Mode
Large Network Point-to-Point or Point-to-Multipoint (up to 32766 sites)
All sites on different LAN subnet
IP v4 only
Feature Support - The demodulator also has several standard and optional features to further
optimize security, performance and efficiency.