GB1484780A - Data communication system having a plurality of terminals - Google Patents
Data communication system having a plurality of terminalsInfo
- Publication number
- GB1484780A GB1484780A GB133175A GB133175A GB1484780A GB 1484780 A GB1484780 A GB 1484780A GB 133175 A GB133175 A GB 133175A GB 133175 A GB133175 A GB 133175A GB 1484780 A GB1484780 A GB 1484780A
- Authority
- GB
- United Kingdom
- Prior art keywords
- data
- buffer
- address
- block
- central station
- 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
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/423—Loop networks with centralised control, e.g. polling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/24—Time-division multiplex systems in which the allocation is indicated by an address the different channels being transmitted sequentially
- H04J3/245—Time-division multiplex systems in which the allocation is indicated by an address the different channels being transmitted sequentially in which the allocation protocols between more than two stations share the same transmission medium
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Small-Scale Networks (AREA)
Abstract
1484780 Data transmission; common channel systems BURROUGHS CORP 13 Jan 1975 [4 Feb 1974] 1331/75 Heading H4P [Also in Division G4] In a data communication system, a plurality of terminals are connected (e.g. in a loop) to a central station which generates message blocks each including a terminal address, the address in one block being randomly selected and being incremented to form the addresses in precessive blocks. As disclosed, each block also includes two frames for synchronizing and conditioning the addressed terminal for data transfer, and a data interval. On recognizing its address, a terminal loads the data interval in the block from a buffer within itself to send to a buffer at the central station, or loads its buffer from the data interval with data from the central station. The loop may be a cable TV line. As a mcdification, only active terminals need be addressed, these being determined by a periodically-performed sampling poll or by picking up an indication during a regular poll.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US43931374A | 1974-02-04 | 1974-02-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1484780A true GB1484780A (en) | 1977-09-08 |
Family
ID=23744186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB133175A Expired GB1484780A (en) | 1974-02-04 | 1975-01-13 | Data communication system having a plurality of terminals |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1484780A (en) |
-
1975
- 1975-01-13 GB GB133175A patent/GB1484780A/en not_active Expired
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940113 |