the same features and functions as the central unit
as well as, have the same wiring and capacity
requirements. Remote units will be connected to the
central unit via direct interface using a 1.544 Mb/s
T1 span line. The requirements defined for the
central unit will also apply to the remote units.
Software requirements or features will be structured
in accordance with each particular system being
designed. Delete any features not required for any
particular system.
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Provide equipment consisting of stored program, processor controlled
Electronic Private Automatic Branch Exchange (EPABX) Telephone Switching
System utilizing pulse code modulation (PCM) architecture.
2.3.1
Switching Network
Switch shall be a stored program, processor controlled PCM system utilizing
solid state construction. Switching network shall be of modular type
construction to allow additions to the network or system without
interruptions or downtime to the system.
2.3.2
Processor[s]
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NOTE: Designer should decide on the number of
processors required based on USER's requirement.
Where extremely reliable communications are required
with little downtime, dual processor is recommended.
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Switching network and other associated functions of the system shall be
under the control of [dual] [a single] central processor[s] utilizing
stored program control. Stored system control program shall automatically
reprogram and restart the system in the event of power failure. Programs
which control functions of the user system shall utilize language which is
oriented toward a person-machine interface.
2.3.2.1
Control Programs
Control programs such as trunk routing, digit sending and receiving, and
assigning trunk quantities shall be locally or field programmable by means
of an interface with a terminal. Programs shall be flexible to the extend
that line assignment and class of service type changes can be made in the
field by way of this terminal interface.
2.3.2.2
Maintenance Diagnostic Program
Provide system with maintenance diagnostic program for complete system
tests. Program shall be in continuous operation and structured so that any
fault that is detected is immediately printed out on a maintenance terminal
or indicated on a cathode ray tube (CRT). Diagnostic tests that contain
no-fault conditions shall be printed out during specified times of day or
upon demand. Program shall be integrated into the processor control system
so that when faults are registered an automatic transfer of equipment will
take place within the system to remedy a fault condition. Automatic
transfer of equipment to remedy a fault condition is required only for
equipment that would affect a common control portion of the switching
SECTION 16720N
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