Instruction Manual

10 745-814-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 eld 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