User's Manual

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The Modem Initialization Process – p. 28
Chapter 3. The Modem Initialization
Process
To understand the configuration process, it is useful to understand the
detailed steps the modem goes through during its initialization.
When the modem is first powered up, it must go through a fixed sequence of
steps before it can exchange data with the network. To be successful, this
requires the modem and the WMTS to be configured with various
parameters.
These parameters should be defined in a Network RF Plan and a Network IP
plan set up by your System Engineer. The three Network Servers (TOD,
DHCP, and TFTP) must be installed and operational. The WMTS must be
configured with the correct software and an IP address.
The modem’s RF parameters must also be correctly configured with the
proper software and its RF parameters must be set correctly. When all of
this is done, the modem is ready to initialize itself when placed at the
customer’s premise.
Finally, after initialization, the modem’s E1/T1 port must be “bound” (configured
to connect) to the correct E1/T1 port on the WMTS. This step may be done last
or pre-configured before the modem is at the customer’s premise.
The following sections provide an overview of the modem initialization process.
3.1 Modem Initialization Sequence
All modems proceed through the following sequence of steps, each of which
is described in more detail below. The completion of these steps establishes
connectivity at the DOCSIS and IP layers. Connectivity for additional layers,
e.g., E1/T1, may then be established for the V311 and V312 modems. The
steps are:
• Power-On Self Test
• Downstream Synchronization
• Obtain Upstream Parameters
• Ranging
• Establish IP Connectivity
• Establish Time of Day
• Transfer Operational Parameters
• Registration
• Baseline Privacy Initialization
3.1.1 Power-On Self Test
The modem performs a self-check to ensure that its hardware is working
properly.