Comtech EF Data CDM-570 - Manual (Page 438)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Appendix G MN/CDM570L.IOM
G–2
G.3 IP Module Working Modes
Two IP Module Working Modes are available: Managed Switch Mode (formerly
easyConnect
TM ), and Router Mode. Examples for each are provided later in this section.
Operation for each working mode differs based on the installed module’s hardware version
(V1/MPP-50 or V2/MPP-70) and its firmware version.
G.3.1 Working Modes – HDLC Encapsulation
HDLC Encapsulation is available only in IP Module V1/MPP-50 Firmware Ver.
1.6.# and earlier, and IP Module V2/MPP-70 Firmware Ver. 2.1.# and earlier.
This section describes the functionality of these separate HDLC Modes, which serve to minimize
the HDLC overhead transmitted over the satellite based upon the size of their network. Three
HDLC Addressing Modes are available:
• Point-to-Point • Small Network • Large Network
In order to optimize Comtech EF Data IP modems in the network (based upon Network Topology
and Ethernet Traffic requirements), note the following:
• In Router/Point-to-Point Mode, no HDLC address is transmitted.
• Router/Small Network Mode transmits 1 byte.
• Router/Large Network Mode transmits 2 bytes as part of the HDLC header for each
packet; non-IP traffic is not supported in Router Mode.
The Working Mode and HDLC Address Mode of the Comtech EF Data IP
modems must be identical to pass traffic between modems.
Changing the Working Mode or HDLC Address Mode of the IP modem requires
the IP Module to be rebooted. Before selecting a different mode, the IP Module
issues a notice that the mode change will require a reboot.
Working Mode
HDLC Address Mode
Network Topology Ethernet Traffic
Managed Switch Mode
Point-to-Point Point-to-Point only
Both sites on same LAN subnet
IP v4 and/or non-IP
Router Mode
Point-to-Point
Point-to-Point only
Both sites on different LAN subnet
IP v4 only
Router Mode
Point-to-Point or Point-to-MultiPoint
(up to 254 sites)
IP v4 only
Small Network All sites on different LAN subnet
Router Mode
Point-to-Point or Point-to-MultiPoint
(up to 32766 sites)
IP v4 only