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The term digital commutation is directly related with the communication (or connection) networks.
Formerly, any communication established through a switch station occupied a physical path separate from the rest, by means
of a matrix of cross points, mechanically implemented (spatial commutation).
Thanks to the development of the digital technology, the electromechanical networks have been replaced by ELECTRONIC
CIRCUITS, based on the digital (or temporal) commutation.
The CODITEL equipment is based on a digital or temporal commutator enabling the study of emission in any order on the
channels of an outlet multiplex. The samples that are shown in a certain order, on channels of an inlet multiplex.
CODITEL is a digital circuit commutation equipment for
didactic purposes from the company EDIBON,S.A..Its
structure is like a
. Basically,
.
The equipment consist of the following parts: interfaces
(connection with the outer world), internals, digital connection
network and control system:
Consists of
, made in different ways:
The multifrequency circuits are hybrid integrated circuits
carrying out all the basic functions of a line circuit.
The decadic circuits, where all their structure is mounted
discrete components.
The four line circuits are compatible with commercial user
apparatus, and they are physically arranged in two identical
boards, each board containing two circuits of each type.
The equipment has ,
(decadic) and the other are
, assigned to a specific line.
The equipment has a that supplies the appropriate
temporization for the whole system and a
The connection network is a ,
made with . Its architecture is like the one with a
The control is carried out by a program stored in the computer
(PC), and it is executed under the DOS operating system.
For communication with the computer, the equipment has a
board that serves as interface with the control, called
.
The communication between the computer (PC) internal bus
and the commutator is made by means of a board (or printed
circuit board), installed on an expansion SLOT of the computer
(PC). The board has , and a
temporal commutator structure with two
MIC ways, one inlet way and one outlet way it
follows the recommendation of the CCITT and of
Telephony
four user line circuits two lines for tone
terminals (multifrequency) and two lines for pulse
terminals (decadic)
four number receiver two of them are
pulse receivers tone receivers
(DTMF)
time base
digital tone
generator.
:
temporal commutation matrix
memories
sequential writing and asynchronic reading commutator.
telephonic system interface (T.S.I.)
EIGHT posts of eight bits bus
communicating the computer with the T.S.I. Masukan ke Produk RekananKenalkan ke teman Anda