P-971M User’s Guide

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Chapter 4 SNMP Event Log

SYNC Timing Synchronization failure, Acquired FEC framing - Failed to 

acquire MPEG2 Sync (Critical)

Your P-971M attempted to lock on to the downstream channel and was able to acquire 
forward error correction (FEC) framing, but then failed to lock on to the MPEG2 
synchronization signal. 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol 

timing (Critical)

Your P-971M could not lock on to the downstream channel’s quadrature amplitude 
modulation/quadrature phase shift keying (QAM)/(QPSK) signal.

SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame 

within time-out period (Critical)

Your P-971M was able to acquire the media access control (MAC) framing initially, but 
subsequently failed to receive the MAC SYNC frame within the specified timeout period. 
Note that this is not an ethernet MAC frame type.

SW Upgrade Failed Before Download - Server not Present (Error)

You P-971M has made 16 unsuccessful attempts to download a new ZyXEL software image 
from the TFTP server (CMTS or other TFTP server). After 16 attempts your cable modem 
aborts the upgrade procedure. This error message might also occur if your cable modem has 
received a fatal TFTP server error.

SW upgrade Failed after download - Incompatible SW file (Error)

An upgrade of your P-971M software failed because the downloaded image file was either the 
wrong image, type, or was corrupted during file transfer.

UCD invalid or channel unusable (Critical)

The cable modem received an Upstream Channel Descriptor (UCD) message from the

CMTS, but it contains invalid information or specifies an upstream channel that is unusable. 

A transmit opportunity was missed because the MAP arrived too late 

(Information)

Your P-971M missed a transmit opportunity because the Bandwidth Allocation MAP (one slot 
of the Time Division Multiplexing) signal arrived too late for your P-971M to use it. 

DHCP FAILED - Discover sent, no offer received (Critical)

Your P-971M sent a DHCP discovery broadcast message to the cable operator’s CMTS, but 
no DHCP server or DHCP relay agent replied with a DHCP offer response message.