2 single ip mode vs. dual ip mode overview, Fig. 2-1, single ip mode, Fig. 2-2, dual ip mode – Alpha Technologies AlphaNet DSM Series DOCSIS User Manual

Page 10: Single ip mode vs. dual ip mode overview, Fig. 2-1, single ip mode fig. 2-2, dual ip mode, Section 2.2

745-814-B0-001, Rev. A

2.0

System Overview, continued

2.2 Single IP Mode vs. Dual IP Mode Overview

One CM IP address only

accessible on the private (LAN)

network with access to both CM

and transponder data.

MIB Tables

Transponder

Cable Modem

XP-DSM

CPE IP address, transponder

data only; accessible on the

public (CPE) network.

MIB Tables

Transponder (CPE)

Cable Modem

XP-DSM

CM IP address, CM and

transponder data; accessible on

the private (LAN) network.

Fig. 2-1, Single IP Mode

The XP-DSM can operate in either Single (default) or Dual IP Mode. To switch the

transponder from Single to Dual IP Mode the “Block CPE” function must be disabled in the

Discrete Menu of the Alpha MIB (see

Section 6.2

Single IP Mode
In Single IP Mode 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

transponder is not accessible from the public

(Customer Premises Equipment) network.

Consequently, the Network Management

System (NMS) that monitors the power supplies

must have access to the same private modem

network.

Single IP Mode Considerations:

• Communication with the transponder is limited to the private LAN network, and is

very secure.

• Where the IP address pool is limited, there is no need to issue the transponder a

CPE IP address.

• Access to the transponder is limited to the private LAN network making data

management less versatile, especially for field personnel.

Dual IP Mode
In Dual IP Mode the transponder acts like

a CPE device to the cable modem, and

registers a second IP address on the public

CPE network. This allows the power supply

data to be accessed and managed from

anywhere within the public (CPE) network.
Dual IP Mode Considerations:

• The transponder is accessible on

the public (CPE) network. This

makes data management more

versatile.

• Because the transponder is a CPE on the public network, access is less secure.
• The CPE requires its own IP address, which may be in short supply.

NOTE:

The transponder settings determine whether the system operates in Dual or Single IP Mode. The cable

modem always interacts with the transponder both as a CPE and as an extension of its own IP address.

Fig. 2-2, Dual IP Mode