Accession Number:

AD0813528

Title:

WIDEBAND TIME DIVISION SWITCHING TECHNIQUES STUDY.

Descriptive Note:

Final rept. 1 Feb-30 Oct 64,

Corporate Author:

NORTH ELECTRIC CO GALION OH

Personal Author(s):

• Nennerfelt, C.
• Aro, E.
• Ots, A.

Report Date:

1967-03-01

Pagination or Media Count:

356.0

Abstract:

The purpose of this study was to define the problems which are encountered when the channel bandwidth of time division switching systems is extended from 4kHz to 50 kHz, with the limitation that no other modulation techniques, besides sampling, were to be used on the signal. From a theoretical study, several models of the system were selected, and these models were constructed in the laboratory for verification. It was found that the best system approach was to use multiple sampling in a narrowband channel frame to implement the wideband system. This technique was satisfactorily verified in the laboratory. A further conclusion of the study was that the hardware limitations, particularly with regard to the sampling contact performance make a time division multiplexing wideband system uneconomical. A mixed system of both narrowband and wideband channels, could however, be economically feasible. It is recommended, that a hardware development be undertaken to improve the performance capability of the sampling contact.

Descriptors:

• *SWITCHING CIRCUITS
• *ELECTRONIC SWITCHES
• *SAMPLERS
• MULTIPLEXING
• MULTIPLEXING
• STATISTICAL PROCESSES
• BROADBAND
• SAMPLING
• NARROWBAND
• TIME SHARING
• LOW PASS FILTERS
• EQUATIONS
• PHASE SHIFT CIRCUITS
• INTEGRATED CIRCUITS
• DISTORTION
• ATTENUATION
• DATA STORAGE SYSTEMS
• CAPACITORS
• TRANSISTORS
• DIFFERENTIAL EQUATIONS
• INFORMATION THEORY
• RADIO TRANSMISSION

Subject Categories:

• Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE