Abstract
The Small Office Network Data System (SONDS) is a part of the Total Network Data System (TNDS) designed specifically to meet the network data requirements for the small step-by-step offices of the Bell System. Its ability to accurately relate to the load and service characteristics seen in these small, mostly rural offices has ensured its success. It maintains low cost by measuring and recording a single observation per day for each traffic measurement. This is the daily peak hour load per group. A moving average of the mean and variance of peak hour measurements is interpreted by using a modified-Gumbel extreme value distribution function. This has been demonstrated to fit well within the actual distributions of daily peak hour loads. It is used to construct traffic capacity tables that better reflect customers service experience in these offices than do existing methods. It uses field-tested parameter assumptions of the underlying distribution from which peak values are sampled to estimate equivalent time-consistent busy hour loads relative to the observed peak hour loads. This allows service to be compared among SONDS and non-SONDS step-by-step offices. SONDS uses on-site data collection units, a single central computer for all Bell System offices, and provides local printing of output reports. Data are collected each night and daily, weekly, and monthly output reports are distributed over the switched network.
Published Version
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