Abstract To use logging areas with no empty spacing left and trace back the logs to the past, a logging system is provided. Information to be logged includes data and management information managing the data. The logging system comprises memory having a management area and a data area, and a writing element for writing not only management information into the management area with a fixed length but also data into at least one of the data area and the management area. The writing element comprises a member for writing the management information about the data to be written in the data area into the management area with the fixed length and a member for sequentially writing the data into the data area with variable lengths according to the management information. The writing element further comprises a member for determining whether or not the data are less than in size a fixed-length area of the management area, a member for writing the data into the management area when the data are less than in size the fixed-length area, and a member for writing not only the data into the data area but also an address for the data written into the management area, the address being adopted as the management information, when the data are not less than in size the fixed-length area.
A logging system for a transmission system wherein the logging system records, as a log, information to be logged concerning communicated information, the information to be logged including data and management information managing the data, the logging system comprising: memory means having therein a management area and a data area for logging the information to be logged; and writing means for writing not only the management information into the management area with a fixed length but also the data into at least one of the data area and the management area, wherein the writing means comprises means for writing the management information about the data to be written in the data area into the management area with the fixed length and means for sequentially and cyclically writing the data into the data area with variable lengths according to the management information.
Claim 2
Dependent Claim
141 words
A logging system for a transmission system wherein the logging system records, as a log, information to be logged concerning communicated information, the information to be logged including data and management information managing the data, the logging system comprising: memory means having therein a management area and a data area for logging the information to be logged; and writing means for writing not only the management information into the management area with a fixed length but also the data into at least one of the data area and the management area, wherein the writing means comprises means for writing the management information about the data to be written in the data area into the management area with the fixed length and means for sequentially and cyclically writing the data into the data area with variable lengths according to the management information.
Claim 3
Dependent Claim
96 words
The logging system of claim 1 , wherein the writing means comprises means for determining whether or not the data are less than in size a fixed-length area of the management area, means for writing the data into the management area when the data are less than in size the fixed-length area, and means for writing not only the data into the data area but also an address for the data written into the management area, the address being adopted as the management information, when the data are not less than in size the fixed-length area.
Claim 4
Dependent Claim
101 words
The logging system of claim 1 , wherein the communicated information is information about alarm occurrence and recovery from failures, and the writing means comprises means for comparing the data written last time and the information about alarm occurrence and recovery from failures to be written this time in the second time of logging and its succeeding times of logging, and means for writing the information about alarm occurrence and recovery from failures only when the comparing means shows that the information about alarm occurrence and recovery from failures to be written this time differs from the data written last time.
Claim 5
Dependent Claim
56 words
The logging system of claim 3 , wherein the information writing means for writing the information about alarm occurrence and recovery from failures consists of means for writing only a different piece of information residing between the data written last time and the information about alarm occurrence and recovery from failures to be written this time.