FEASIBILITY MODEL DEVELOPMENT DROP AND INSERT EQUIPMENT FOR MULTIPLEX.
Abstract
The principal aim of the work described herein was the development and construction of a practicable single channel Drop and Insert Multiplex System having a twelvechannel selection capability in the 'B' group from 60KC to 108KC. Secondary aims were analytical verification of design feasibility as applied to 'A' group frequencies from 12KC to 60KC and investigation of state-of-the-art miniaturization techniques in circuitry and packaging. A singlestep modulation and demodulation plan was used with band stop - band pass filters operating at group channel frequencies. Identical phase and amplitude equalizers were installed in the drop circuitry and in the insert path. Outof-band signalling facilities were included. Engineering feasibility model consisted of a relay rack mounted, externally powered, full duplex common equipment unit (voice frequency and signalling circuitry) with 12 sets of plug-in band stop - band pass filter and carrier oscillator subassemblies. Final system tests indicated some improvement is desirable in pass band ripple, particularly in the higher frequency channels. Crosstalk, carrier suppression, distortion and other transmission characteristics were satisfactory. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1965
- Accession Number
- AD0624100
Entities
People
- Foster W. Frazee
- Joseph F. Doyle