GB1499738A - Direct connection digital data transmission apparatus - Google Patents
Direct connection digital data transmission apparatusInfo
- Publication number
- GB1499738A GB1499738A GB2009175A GB2009175A GB1499738A GB 1499738 A GB1499738 A GB 1499738A GB 2009175 A GB2009175 A GB 2009175A GB 2009175 A GB2009175 A GB 2009175A GB 1499738 A GB1499738 A GB 1499738A
- Authority
- GB
- United Kingdom
- Prior art keywords
- data transmission
- data
- conductors
- code signal
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Dc Digital Transmission (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
1499738 Data transmission COMPUTER TRANSMISSION CORP 13 May 1975 20091/75 Heading H4P Apparatus for connecting digital equipment to a D.C. data transmission 100P having at least one pair of conductors comprises a constant current generator connectible to each of said conductors; means for connecting a source of digital data to control the direction of current flow from said generator to said conductors; means for generating a code signal of alternate marks and spaces indicative of one control function; means for generating a plurality of code signals of predetermined lengths of spaces indicative of a plurality of other control functions; and means for introducing said code signals into said connecting means. The arrangement is such that the apparatus generates and transmits control information which is segregated from data, and accomplishes the necessary control functions without the need for data storage devices. Thus, signalling and the establishment of connections, are accomplished using the first mentioned code signal, whilst the second mentioned code signal constituted by trains of spaces represents other control information. The apparatus may include a noise rejection circuit which responds only to the pulse length and does not affect the amplitude of any valid pulses, and it may also include test facilities.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2009175A GB1499738A (en) | 1975-05-13 | 1975-05-13 | Direct connection digital data transmission apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2009175A GB1499738A (en) | 1975-05-13 | 1975-05-13 | Direct connection digital data transmission apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1499738A true GB1499738A (en) | 1978-02-01 |
Family
ID=10140228
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2009175A Expired GB1499738A (en) | 1975-05-13 | 1975-05-13 | Direct connection digital data transmission apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1499738A (en) |
-
1975
- 1975-05-13 GB GB2009175A patent/GB1499738A/en not_active Expired
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |