EP0220808A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multiplexer for digital signals
Assignee: AT&T Inc
•
Filing: 1986-08-18
•
Granted: —
•
Expires: 2006-08-18
Abstract
Abstract A plurality of digital signals of one or more digital transmission bit rates e.g., DS1, DS1C, DS2, DS3 are combined into a single transmission signal (IS) by employing a unique common channel frame format via 201 and one step multiplexing process via 202. The channel frame format includes a plurality of data bit positions and a plurality of overhead bit positions. The number of data bit positions used is dependent on the particular incoming signal. Similarly, the number of frames generated during a specific common framing interval is dependent on the digital transmission bit rate of the particular signal. Specifically, the number of channel frames generated during the common channel frame interval is dependent on a number of equivalent so-called lowest transmission bit rate signals, i.e., DS1 signals, included in the particular signal being formatted. The overhead bits are distributed in the channel frame format. Digital words Fig. 2 words 1-84 from the channel frames are inserted into predetermined groups of data word positions in a repetitive frame of a single transmission signal (IS). The number of data words in a group is also dependent on the number of equivalent lowest transmission bit rate signals, i.e., DS1 signals, in the particular signal in the particular signal being combined.
Inventors
- 👤 Eric Humphrey Angell
- 👤 Thomas Joseph Aprille
- 👤 Rong-Chin Fang
- 👤 Byeong Gi Lee
- 👤 Jan-Dieter Spalink
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 16:47
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38; H; H04; H04J; H04J3/00; H04J3/16; H04J3/1605; H04J3/1623; H04J3/1641
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
145 words
Apparatus for combining a plurality of digital signals of one or more digital transmission bit rates into a transmission signal, CHARACTERIZED BY means for supplying a predetermined number of digital words from each of said plurality of digital signals being combined during a predetremined frame interval of said transmission signal; and means for inserting said number of supplied digital words for each particular digital being combined into a corresponding number of data word positions of a repetitive frame of said transmission signal during said predetermined transmission signal frame interval, the number of said digital words supplied and the number of data word positions in said transmission signal frame for each particular digital signal being dependent on a predetermined relationship of the digital transmission bit rate of the particular signal being combined and a transmission bit rate of one of a predetermined set of digital signals.
Claim 2
Dependent Claim
145 words
Apparatus for combining a plurality of digital signals of one or more digital transmission bit rates into a transmission signal, CHARACTERIZED BY means for supplying a predetermined number of digital words from each of said plurality of digital signals being combined during a predetremined frame interval of said transmission signal; and means for inserting said number of supplied digital words for each particular digital being combined into a corresponding number of data word positions of a repetitive frame of said transmission signal during said predetermined transmission signal frame interval, the number of said digital words supplied and the number of data word positions in said transmission signal frame for each particular digital signal being dependent on a predetermined relationship of the digital transmission bit rate of the particular signal being combined and a transmission bit rate of one of a predetermined set of digital signals.
Claim 3
Dependent Claim
46 words
The invention as defined in claim 1 CHARACTERIZED IN THAT said inserting means inserts said number of digital words for each particular digital signal being combined into a group of data word positions in said transmission signal frame associated with the particular digital signal being combined.
Claim 4
Dependent Claim
80 words
The invention as defined in claim 2 CHARACTERIZED IN THAT said predetermined set of digital signals includes a digital signal having a first predetermined transmission bit rate and wherein said number of words inserted by said inserting means in the group of data word positions for a particular digital signal during said predetermined transmission signal frame interval is directly dependent on the number of equivalent ones of said first transmission bit rate signal in said particular digital signal being combined.
Claim 5
Dependent Claim
35 words
The invention as defined in claim 3 CHARACTERIZED IN THAT said supplying means supplies said digital words to said inserting means in a prescribed sequence dependent on the particular ones of the signals being combined.
Claim 6
Dependent Claim
36 words
The invention as defined in claim 4 CHARACTERIZED IN THAT said first transmission bit rate signal is the one of the digital signals in said predetermined set of digital signals having the lowest transmission bit rate.
Claim 7
Dependent Claim
29 words
The invention as defined in claim 5 CHARACTERIZRED IN THAT said predetermined set of digital signals includes at least a DS1 signal, DS1C signal, DS2 signal and DS3 signal.
Claim 8
Dependent Claim
53 words
The invention as defined in claim 6 CHARACTERIZED IN THAT the number of said digital words inserted in a group for each DS1 signal being combined is one, for each DS1C signal being combined is two, for each DS2 signal being combined is four and for each DS3 signal being combined is twenty-eight.
Claim 9
Dependent Claim
97 words
The invention as defined in claim 3 CHARACTERIZED IN THAT said transmission signal repetitive frame includes a predetermined number of data word positions and a predetermined number of other word positions, said predetermined number of data word positions in said transmission signal frame is a predetermined number of equivalent ones of said first transmission bit rate signal and wherein said inserting means includes means for inserting digital words supplied thereto into said transmission signal frame data word positions up to a number equal to said predetermined number of equivalent ones of said first transmission bit rate signal.
Claim 10
Dependent Claim
57 words
The invention as defined in claim 8 CHARACTERIZED IN THAT said first transmission bit rate signal is the one of the digital signals in said predetermined set of digital signals having the lowest transmission bit rate and said predetermined number of equivalent ones of said lowest transmission bit rate signal in said transmission signal frame is eighty-four.
Claim 11
Dependent Claim
38 words
The invention as defined in claim 5 CHARACTERIZED IN THAT said inserting means includes means for controllably interchanging data word positions of said supplied digital words for insertion into the data word positions of said transmission signal frame.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.