Decoding method for T1 line format for ccitt 32K bit per second adpcm clear channel transmission and 64 KBPS clear channel transmission

Patent · Tue May 24 00:00:00 EDT 1988

OSTI ID:6948649

Blondeau, Jr, E E; Czarnecki, S J

In a data transmission system having first and second digital switching systems connected via T1 line transmission facilities for bidirectional data transmissions, a decoding method for T1 line zero bit suppression is described comprising the steps of: receiving an encoded T1 line frame including bundled channels; testing indicator bits of the received T1 line frame to determine whether any channel of the T1 line frame has been altered for the transmission; first transferring the received T1 line frame as received, performed in response to the indicated bits showing that no alteration have been made to the received T1 line frame; decoding mapping bits of the received T1 line frame to determine which channels of the bundle of the received T1 line frame have been altered for the encoded transmission; replacing the contents of each of the altered channel of the bundle with zeroes; iterating the steps of decoding and replacing for each of the bundles of the received T1 line frame; and second transferring the received T1 line frame with the altered channels being replaced with zeroes.

• Assignee: GTE Communication Systems Corp., Phoenix, AZ
• Patent Number(s): US 4747112
• OSTI ID: 6948649
• Resource Relation: Patent File Date: Filed date 2 Sep 1986
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
42 ENGINEERING
DATA TRANSMISSION SYSTEMS
DESIGN
DATA TRANSMISSION
DIGITAL SYSTEMS
EFFICIENCY
OPERATION
SWITCHING CIRCUITS
COMMUNICATIONS
ELECTRONIC CIRCUITS
990220* - Computers
Computerized Models
& Computer Programs- (1987-1989)
420800 - Engineering- Electronic Circuits & Devices- (-1989)