ZyXEL Communications P-971M 2.1.2 Connectivity State, 2.1.1 Acquire Downstream Channel

P-971M User’s Guide

Figure 5 Connection Status Screen

2.1.1 Acquire Downstream Channel

The P-971M must lock on to a cable operator’s offered channel to operate successfully. After downloading the configuration file and checking its contents, your cable modem will attempt to lock on to the offered channel. If successful, your cable modem has Locked on to the channel; otherwise it is In Progress.

2.1.2 Connectivity State

The connectivity state is the current status of the connection between the cable modem and your cable operator. During the initial negotiation with your cable operator’s CMTS, the P- 971M must establish a clear upstream and downstream channel, which it accomplishes in a series of well defined steps. If the configuration file download, installation, DHCP, timer settings, and communication channel negotiation succeeded, your cable modem is OK and Operational; otherwise it is In Progress and one of the seven messages described in the paragraphs below.

You will see Not Synchronized if the P-971M did not detect synchronization for QAM signal timing, synchronization for FEC framing, synchronization for MPEG packets, or recognize synchronization of downstream channel MAC address.

You will see Upstream Parameters Acquired if the P-971M is waiting for an upstream channel message from your cable operator’s CMTS.

You will see Ranging Complete if the P-971M has successfully adjusted local channel parameters (downstream power/frequency, upstream power/frequency, channel ID) and all values are within specified ranges.

25 Chapter 2 Connection Screen.