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Incoming Peg Count (DMS)
Maintenance Busy Count (2E, 3E)
Detector Group Usage (SxS, 5XB, XBT, 1XB)
In ESS and DMS offices, traffic data is collected by the central processor of
the switch. In electomechanical offices such as crossbar, a Traffic Usage
Recorder is used to scan trunks and other components about every 100 seconds,
counting how many are in use. This data when compiled is sent to the EADAS
system, which is located in the Operating Company's Network Data Collection
Centers and runs on a minicomputer. 4ESS and 4Xbar toll offices do not use
EADAS, but their own system called the Peripheral Bus Computer for traffic
data analysis. After receiving the traffic data from up to 80 switching
offices, EADAS performs two basic functions: It processes some data in near
real time (shortly after it is received) to provide hourly and half hourly
reports and a short term database for network administrators. It also collects
and summarizes data that it will pass on to the other TNDS systems via data
links or magnetic tape.
Three other systems receive directly from EADAS. These systems are ICAN,
TDAS, and EADAS/NM. ICAN stands for Individual Circuit Analysis plan and is
used to study individual circuits in central office equipment that have been
specified by network administrators.
TDAS is the Traffic Data Administration System, which formats traffic data
for use by the remaining downstream systems. ICAN and EADAS/NM are the only
two systems with data links to EADAS that don't have their data formatted by
TDAS before reception. TDAS is run on a mainframe in the NDCC and can be
thought of as a distribution facility for the traffic data. EADAS/NM is used
to watch switching systems and trunk groups designated by network managers,
and reports existing or anticipated congestion on a display board at the
Network Management Centers, where the system is located. Problems can be
analyzed with this system and dealt with within a short period of time after
they occur.
Central Office Reporting Systems
--------------------------------
There are five TNDS engineering and administrative systems that provide
operating company personnel with reports about CO switching equipment. These
are the LBS, 5XBCOER, SPCSCOER, ICAN, and SONDS. LBS, the Load Balance System,
helps assure that the customer traffic load is uniformly distributed over each
switching system. It minimizes congestion on the concentrators, which allow
subscribers to share the equipment in the switch. The LBS analyzes traffic
data coming to it from TDAS to determine the traffic load on each line group
that the system serves. LBS generates reports used by the NMC to determine
line groups that can have new incoming subscriber lines assigned to them. LBS
also does a load balance indexes for the entire operating company, indicating
how effectively each CO has avoided congestion.
Crossbar #5 Central Office Equipment Reports (5XBCOER) and Stored Program
Control Systems COER used for 1, 2, and 3 ESS offices, analyze traffic data to
indicate the overall service provided by the switching system and to tell how
much of its capacity is being used. This info helps determine if new equipment
is needed.
ICAN, which was described briefly above, detects switching system
equipment faults by identifying abnormal load patterns on individual circuits.
A series of reports printed at the Network Administration Center helps network
administrators analyze individual circuit usage and verify circuit grouping.
ICAN is located at the BOC main computer center along with 5XBCOER.
The fifth CO equipment reporting system is called the Small Office Network
Data System, or SONDS. SONDS performs a full range of data manipulation
functions, and is used to provide economically the full TNDS features for step
by step offices. Step offices send data directly to this system, and it is not
formatted by EADAS or TDAS, as it doesn't go through these systems. Weekly,
monthly, exception and on demand reports are automatically distributed by
SONDS to the NAC personnel.
Trunk Network Reporting Systems
-------------------------------
These systems are parts of the TNDS used by the Circuit Administration
Center to support trunk servicing and forecasting. The Trunk Servicing System
helps trunk administrators develop short term plans to make the best use of
the trunks that are already in use. It receives and processes data received
from TDAS and computes offered load. Offered load is the amount of traffic a
trunk group would have carried had the number of circuits been large enough to
handle the load without trunk blocking (giving the caller a re-order or all
circuits busy recording). TSS produces weekly reports showing underutilization
of trunks and below grade of service trunk groups which do not have enough
trunks in them. The CAC uses these reports to add or disconnect trunks
according to what traffic requirements exist.
The Traffic Routing and Forecasting System, replacing the Trunk
Forecasting System, forecasts message trunk requirements for the next five
years. Major conversions and similar network changes are all taken into
consideration when determining the future traffic needs. TRFS receives data
from EADAS, TDAS, and TSS and is located at the Operating Company computer
center.
Since TDAS and some of the downstream TNDS systems need much of the same
information, that information is maintained in a system called Common Update.
In this manner, some data does not have to be duplicated in each individual
system. Some of the information includes the configuration of switching