Alpha Technologies DSM3 for XM2 - Technical Manual - Manual (Page 87)

87 745-814-B8-001, Rev. C (03/2014)
13.0 Dual IP Mode (Addendum)
13.1 Overview
The DSM3 Series can operate in either Single (default) or Dual IP Mode. In Single IP mode, data from
both the cable modem and power supply are accessed and managed through the modem’s IP address on
the secure private modem network. In Dual IP mode, the Communications Module acts like a CPE device
to the cable modem and registers a second IP address on the public CPE network.
The following table lists some of the common characteristics of the DSM3 Single IP and Dual IP
configurations:
Single IP Dual IP
Network All data from both the cable modem and power
supply are accessed and managed through
the modem’s IP address on the secure private
modem network.
The Communications Module acts like a CPE device to
the cable modem and registers a second IP address on
the public CPE network.
Data Access The Network Management System requires
access to the same private modem network.
Dual IP mode allows the power supply data to be
accessed and managed from anywhere within the
public (CPE) network.
Security Communication with the Communications
Module is limited to the private LAN network,
and is very secure.
Since the Communications Module is a CPE on the
public network, access may be less secure.
IP Addresses Where the IP address pool is limited, there is
no need to issue the Communications Module
a CPE IP address. Only one (1) IP Address is
required for the cable modem of the DSM3.
The CPE requires its own IP address, which may be
in short supply. A total of two (2) IP addresses are
required, one for the cable modem and one for the
Communications Module.
Data Management Access to the Communications Module is
limited to the private LAN network making data
management less versatile, especially for field
personnel.
The Communications Module is accessible on the
public (CPE) network. This makes data management
more versatile for field personnel.
Table 13-1, Single IP Mode versus Dual IP Mode
One CM IP address only accessible on the private (LAN)
network with access to both CM and Communications
Module data.
Cable Modem Communications Module
MIB Tables
DSM
Fig. 13-1, Simplified Block Diagram Single IP Mode
Cable Modem
Communications Module
(CPE)
MIB Tables
DSM
One CM IP address, CM and Communications Module
data; accessible on the private (LAN) network.
One CPE IP address, Communications Module data only;
accessible on the public (CPE) network.
Fig 13-2, Simplified Block Diagram Dual IP Mode