Browse Prior Art Database

Telecommunications Error Logging Control Method

IP.com Disclosure Number: IPCOM000103608D
Original Publication Date: 1993-Jan-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 5 page(s) / 206K

Publishing Venue

IBM

Related People

Eijan, UG: AUTHOR [+4]

Abstract

Described is a programmable error-logging control method for telecommunications mechanisms based on the frequency of errors. The method controls error-checking functions so as to avoid system interruption by masking the errors until the error frequency rate is high enough to stop the telecommunications system.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 43% of the total text.

Telecommunications Error Logging Control Method

       Described is a programmable error-logging control method
for telecommunications mechanisms based on the frequency of errors.
The method controls error-checking functions so as to avoid system
interruption by masking the errors until the error frequency rate is
high enough to stop the telecommunications system.

      In prior art, errors, typically caused by noise or other
interferences, would signal error-detecting high-speed
telecommunication mechanisms which, in turn, which would slow down
the transmitting operations.  Often the errors were not significant
enough to have the system indicate a malfunction and to interrupt the
operation.  The concept described herein provides a means of
circumventing the interference errors by providing three basic
functions:
     1) Reporting the number of errors over a user-defined time
interval
     2) Accurately counting the low occurrence of errors
     3) Polling the potentially high occurrence of errors

      A configuration control block (CCB) is used by the user of a
network primary rate adapter for configuration of the adapter.  The
CCB is initiated to provide a statistical interval that defines the
length of the time period over which errors are logged.  Fig. 1 shows
a block diagram of the CCB words 5, 6 and 11.  In the preferred
embodiment the telecommunication system used consists of a trunk line
or T1 line.

      At end of the interval, the number of each type of error is
logged in a table, referred to as the T1 control block.  Tabulated
data is returned to the user for analysis of T1 errors.  The T1 line
statistic call address provides a mechanism for passing the T1
control block (T1CB) information back to the user.  After the T1CB,
for the defined interval, has been created, its address is placed in
a register and control is passed to the routine pointed to by the T1
statistics call address (SCA).  This routine is used by the user for
error status information, as desired.

      There are two separate circuit cards involved in the T1
communications error-logging function: a network primary rate adapter
card and a subsystem controller card.  The user is defined as the
code running on the subsystem controller card.  This code interfaces
with the network primary rate adapter card by way of a set of
routines referred to as the communication hardware interface control
(CHIC) code.  The CHIC receives the block of T1 errors in an
occurrence table.  The CHIC will then pass back this information in
the T1CB which contains the occurrence table information plus a
sequence number and device number.

      The network primary rate adapter contains two digital signal
processors (DSPs): DSP1 for transmit; and DSP2 for receive.  DSP2
processes the receive data and will be notified of an error by means
of an interrupt signal (INT0) signal and an error status register
(ESR).  T1 error statistics are ta...