Central office is an
important part of a digital switching system. A central office which is also
known as exchange is a large complex system with many subsystems. Each
subsystem carry unique characteristics and functionality. Telephone services is
an important service to mankind nowadays and since digital switching system is
an integral part of telephone services, utmost care has to be taken for the
fine analysis of such systems. In a digital switching system, central office is
linked to main distribution frame, trunk distribution frame, power plant,
carrier facilities, digital X-connect and special services. Main distribution
frame is a location where all lines and other related links are cross connected
to a central office switch. This location is labour extensive and all the lines
from subscribers terminates here. Trunk distribution frame is a location where
all trunks and other related links are cross connected to central office. Main
distribution frame is referred as line side of the switch and trunk
distribution frame as trunk side of the switch. Power converters, battery
systems and emergency power sources are included in the power plant. Carrier
facilities component provide carrier facilities between central office and
other parts of the network. Digital X-connect which is a small switching system
for trunks provides automatic assignments and cross-connection of trunks to digital
switching systems. Special service provides extra services like data services
and wireless services.
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