DCP Series Telcon Message Manual - Public Support Login - Unisys

Event 2 COMMUNICATIONS LINE PROTOCOL ERROR DETECTED
OVERRUN
Description: The Common Network Management Service (CNMS) X.25 interface
module in PDNSVS received a recoverable line-error notification. The reason is
because an overrun chain status occurred during input. This event includes the LINE
name.
R8: CNMS recoverable line-error reason code
R10: PDNGRP STE index
Attributes affected: Supplementary text message, Line event. The X.25 PSCS
program product generates this CENLOG.
Procedure: PDNSVS
RESPONSE TIMER EXPIRATION (UNISCOPE)
Description: This status bit is set if the response timer expires. The response timer
is started as soon as the data transfer is initiated, and is terminated without error
when the line module becomes synchronized with the line. If this timer expires, it
indicates that the data transfer never got started and that the terminals are either
malfunctioning or not connected to the UNISCOPE line. R8 contains the value 0800 or
0801 (bit 11 will be set). This CENLOG is generated by UNILPH. For more
information on UNILPH CENLOG entry descriptions, refer to Section 1 of this manual.
Action: If these errors occur for many terminals on the same line, check and repair
the line hardware and its electrical environment (including cables, modems, DCMs,
and multiplexers).
If these errors occur for only one terminal, or only for terminals connected to the
same cluster controller, check and repair the terminal or cluster.
If none of the above actions correct the problem, you must increase the response
timer value to accommodate any onsite timing differences that may be occurring.
This is done using the LCLASS RSPTIMER parameter at system generation time.
If these errors occur often enough to cause undue overhead to the system, you can
issue an NMS DOWN command for the line, poll group, or terminal as applicable.
When the malfunctioning hardware has been taken offline, issue an NMS UP
command to restore a normal operating environment.
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