Comtech EF Data CDM-IP 300L - Manual (Page 34)

CDM-IP 300L IP-Centric Satellite Modem Rev. 1
CD/CDMIP300L.IOM
6
10 B
ase
T
L
A
N
10.
10.2
.0 /
16
1
0 Ba
seT
L
A
N
1
0.1
0.1.
0 /1
6
Satellite
Satellite dish
25
6
kb
ps
TX
Hub CDM-IP 1
(efi0) 10.10.1.1/16
Satellite dish
25
6 k
bp
s
Remote CDM-IP 2
(efi0) 10.10.2.1/16
PC
IP 10.10.1.100/16
PC
IP 10.10.2.100/16
TX
RX RX
Figure 1. easyConnect  Diagram
This diagram shows a 256 kbps Point-to-Point duplex link in easyConnect  Mode. Note
that both sides of the link are on the same IP subnet - 10.10.0.0/16. There are no routes or
HDLC addresses to configure. When the system is powered-up, all packets from each
subnet (local and remote) will be sent over the satellite interface. Each CDM-IP learns
which devices are attached to their local Ethernet interfaces and will only send packets
over the satellite that are not destined for the locally attached devices.
Router Mode – This mode allows up to 256 static routes to be configured and can
operate in Point-to-Point, Small Network and Large Network Mode. Small and Large
Network Modes allow for multiple CDM-IP modem communication links. A Small
Network is defined as up to 254 separate HDLC addresses and Large is from 255 to
32766 separate HDLC addresses. The reason for the separate HDLC Modes is to allow
the user to minimize the HDLC overhead transmitted over the satellite based upon the
size of their network. In Point-to-Point, no HDLC address is transmitted; Small Network
transmits 1 byte and Large Network transmits 2 bytes as part of HDLC header for each
packet. Non-IP traffic is not supported in Router Mode.