Browse Prior Art Database

Communications Statistical Network Analysis Program

IP.com Disclosure Number: IPCOM000051647D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 5 page(s) / 141K

Publishing Venue

IBM

Related People

Calva, JR: AUTHOR [+4]

Abstract

The Communications Statistical Network Analysis Program (CSNAP) is a program that controls the logging, retrieval, formatting, and output of statistical data for a computer system communications network. CSNAP is a general-purpose error analysis program where operational performance is viewed in terms of error percent (error data/all data) X 100. Only communications data, free of device or subsystem dependencies, is analyzed. The CSNAP program is an improvement over other state-of-the-art offerings, DEMF (Display Exception Monitoring Facility) or FERS (Facility Error Analysis Recognition System), that give a count of errors only and, also, include unique device dependencies.

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Communications Statistical Network Analysis Program

The Communications Statistical Network Analysis Program (CSNAP) is a program that controls the logging, retrieval, formatting, and output of statistical data for a computer system communications network. CSNAP is a general- purpose error analysis program where operational performance is viewed in terms of error percent (error data/all data) X 100. Only communications data, free of device or subsystem dependencies, is analyzed. The CSNAP program is an improvement over other state-of-the-art offerings, DEMF (Display Exception Monitoring Facility) or FERS (Facility Error Analysis Recognition System), that give a count of errors only and, also, include unique device dependencies.

CSNAP error ratios include the counts of successfully transmitted and received data that produces meaningful performance values. The exclusion of device solves the problem in consistency of function and presentation without loss of real effectiveness. The CSNAP program does the following: Identifies network problems by comparing the present performance of a line with performance at a selected time in the past where the performance was known to be good. This can also be done for each remote communications station directly attached to a line. Identifies the time of day failures occur. Verifies fixes when network components are repaired. Presents the data in either a statistical format or graphic format.

These functions are provided to reduce the time of both the CE (Customer Engineer) and customer in identifying TP (teleprocessing) failures and doing Network Problem Determination (NPD). The function of the program is essentially to build a data base of statistical data that will be used to track line and controller performance. The Statistical Data Record (SDR) on a computer system consists of statistical counters, as in Fig. 5. The CSNAP reports give a system's view of link operations. These statistics are not specific to any terminal dependency or other non-communications characteristic.

CSNAP is broken into three major sections: recording history file statistics recording short-term statistics, and displaying the statistical data.

History File Statistics:

Daily statistics are gathered automatically every day at a time set by the customer. The customer has to enter this value once, and the system will "remember" the time. The data goes into a CSNAP log that is separate from the system error log (Fig. 1). The CSNAP log saves data for 14 consecutive days. Additionally, weekly counts are kept using daily counter values every seventh day. These counts are kept for 53 weeks before being overlaid. Lifetime counter values are kept by storing current SDR contents which contain a total of all SDR counter values from the time the communications were installed. The system prevents loss of data in case of downtime or shutdown before the scheduled log time. At Initial Microprogram Load (IMPL) time, the system will test i...