Instruction Manual

12 745-814-B0-001, Rev. A

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2.0 System Overview, continued

2.5 XP-DSM Start-up and Reboot Routine

The above diagram, read left to right, indicates the order of operations as the transponder comes

online. There are certain conditions that must exist for each step to occur, resulting in successful data

monitoring and management. The numbers below correspond to the numbered arrows above.

When the XP-DSM is installed and powered-up, it nds the DOCSIS frequency being used by the

Cable Modem Termination System (CMTS), and establishes communication.

The CMTS communicates with the DHCP server to get an IP address for the XP-DSM’s cable

modem. The DHCP server must be provisioned with the XP-DSM’s cable modem RF MAC

address for it to recognize the modem as a valid device (Section 3.1). This means the cable

modem’s RF MAC address must be assigned a specic DOCSIS Conguration File, stored in the

TFTP root directory of the TFTP server (Section 3.2).

Once the modem is given an IP address, it is synchronized with the network through the Time of

Day (TOD) Server.

As the modem comes online, the XP-DSM downloads the DOCSIS Conguration le from the

THCP Server, which sets modem options (see Section 3.2).

The XP-DSM transponder’s options are set according to the DSM Setup File (if used). In Dual IP

Mode, the XP-DSM transponder is given its own IP address as a CPE to the modem (see Section

2.2).

Time

Cable Modem

DSM Transponder

DHCP Server Web Browser

MIB Browser

Network Management System

CMTS

Network Devices

TOD Server

TFTP Server

Local Laptop

1 2 3

TCP/IP NetworkHFC Network