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equipment and the trunk network and specifications on traffic registers for
central offices. Numbers recorded by each register are treated consistently by
each system that uses the Common Update data base. There is an update base for
trunking, referred to as CU/TK, and an update on equipment known as CU/EQ. The
trunking part of the Operating Company's data base is coordinated by the Trunk
Records Management System.
Since the TNDS systems are so important to the proper operation of the
network, the CSAR (Centralized System For Analysis and Reporting) is used to
monitor the entire TNDS performance. The NDCC, the NAC, and the CAC are
provided with measurements of the accuracy, timeliness, and completeness of
the data flow through TNDS from beginning to end. It doesn't analyze data from
EADAS/NM, SONDS, or TRFS.
BOC Operations Centers
----------------------
NAC-Network Administration Center. Responsible for optimum loading, and
utilization of installed COE. Performs daily surveillance of COs and trunk
groups to ensure service objectives are being met. The NAC Reviews profiles of
office load relating to anticipated growth. They work with NSEC to initiate
work orders to increase equipment in use. The systems they use are EADAS,
SPCSCOER, CSAR, and SONDS.
NMC-Network Management Centers. The NMC keeps the network operating
efficiently when unusual traffic patterns or equipment failures would
otherwise result in congestion. The NMC analyzes network performance and
prepares contingency plans for peak days, telethons, and major switch
failures. They monitor a near real time network performance data to identify
abnormal situations. The system they use is EADAS/NM.
CAC-Circuit Administration Center. The CAC ensures that in service trunks
meet current as well as anticipated customer demands at acceptable levels of
service. For planned servicing, the CAC compares current traffic loads with
forecasted loads for the upcoming busy season. If the loads are consistent,
the CAC issues the orders to provide the forecasted trunks. When
inconsistencies occur, they examine the variation, develop modified forecasts,
and issue orders based on the new forecast. They review weekly traffic data to
identify trunk groups that need additions and issue the necessary trunk
orders. The systems they use are TSS, TRFS, and CSAR.
NSEC-Network Switching Engineering Center. They plan and design the
network along with the CAC. NSEC develops a forecast of loads for traffic
sensitive switching equipment, sets office capacities, and determines relief
size and timing.
For long range planning, the following offices are utilized.
TNPC-Traffic Network Planning Center. The TNPC determines the most
economic growth and replacement strategies. They handle future network
considerations over a 20 year period for tandem systems, operator services
networks, interconnecting trunks, and switching terminations to accommodate
the trunks.
WCPC-Wire Center Planning Center. This office does the same as the TNPC,
but their jurisdiction includes local switches, the subscriber network, and
interoffice facilities. They have the numbers, types, and locations of
switches and homing arrangements. They also keep track of alternate routes,
tandem centers, etc. Both the TNPC and WCPC provide the CAC and NSEC with
office and network evolution plans for 20 years.
District based maintenance and administration operations are handled by
the NAC, RCMAC, and the SCC. These can cover 240 square miles of serving area.
Network Operations Centers
--------------------------
The highest level of network operations is the Network Operations Center,
located in the AT&T Long Lines HQ in Bedminster, NJ. The main computers used
by the NOC are in Netcong, about 25 miles away, along with some backups. The
NOC are responsible for interregional coordination between the 12 RNOCs, 27
NMCs, and 2 RNMCs in Canada; for monitoring the top portion of toll switches
(all class 1 Regional Centers, 2 Canadian, about 70 class 2 Sectional Centers,
200 Primary centers, some class 4 Toll centers); for monitoring of the
international gateways, and the CCIS network for these switching systems. The
STP signalling links connect STPs to each other, to switches, and to a
centralized database called an NCP (Network Control Point) of which access is
given to switches directly via CCIS.
The Data Transfer Point, which is a data switch that furnishes the NOC with a
flow of monitoring information for all key toll switches, also gives them
information about CCIS STPs and the IOCCs that they monitor.
The operating system supporting the NOC is the NOCS (the S being System),
which is configured with the DTP, a wall display processor, graphics
processors, receive only printers, and CRT terminals for the technicians. The
NOC also uses EADAS/NM through the DTP. Both the NOCS and the DTP run Unix
operating systems.
The second highest level of these operations centers are the RNOCs, or
Regional Network Operations Centers. The 12 RNOCs monitor the CCIS network and
coordinate the 2-3 NMC's activities for its region. The RNOCs use the EADAS/NM
system and something called NORGEN, Network Operations Report Generator, that