Patent US5398249A successfully refreshed from Google Patents.
US5398249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for providing simultaneous multiple circuit-switched type communications on an ISDN basic rate interface
Assignee: Industrial Technology Research Institute
•
Filing: 1992-05-14
•
Granted: 1995-03-14
•
Expires: 2012-05-14
Abstract
Abstract A system is disclosed which permits simultaneous multiple switched type communications on a basic access integrated services digital network (ISDN) without changing the standard frame format for transmission on the S/T interface. Simultaneous communication by up to 2N terminal equipments is achieved by defining a multiframe of N subframes, and separately allocating each of the 2N time slots of the B-channels within the N subframes to up to 2N terminal equipments for simultaneous communication over a single S interface bus.
Inventors
- 👤 Chi-Chang Chen
- 👤 Bor-Shen Wu
- 👤 Jen-Yung Lin
- 👤 Min-Chang Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:51
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04J; H04J3/00; H04J3/16; H04J3/1605; H04J3/1623; H04J3/1647; H04Q2213/00; H04Q2213/13096; H04Q2213/13174; H04Q2213/13176; H04Q2213/13202; H04Q2213/13209; H04Q2213/13215; H04Q2213/13216; H04Q2213/13292; H04Q2213/13299; H04Q2213/13367
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
217 words
A method of communicating on an integrated services digital network (ISDN) basic access system between terminal equipments, a network termination unit connected to the terminal equipments, and a digital subscriber line, said system supporting synchronous bi-directional digital transmission of bits organized into sequential frames, each frame comprising two sequential subframes, each subframe comprising two B-channel octets of bits and a plurality of D-channel bits, said method comprising: (a) generating in a first multiframe clock generating means at a network termination unit a first multiframe clock signal every N subframes, for identifying at said network termination unit multiframes comprising N sequential subframes, where N is an integer equal to or greater than two; (b) generating in a second multiframe clock generating means at a terminal equipment a second multiframe clock signal every N subframes, synchronized in relation to said first multiframe clock, for identifying, at a terminal equipment, multiframes comprising N sequential subframes; and (c) in response to said first clock signal, at said network termination unit and using slot interchange means exchanging particular B-channel octets of said N subframes comprised in each multiframe for transmission to and from up to 2N terminal equipments, said B-channel octets of said N subframes comprised in each multiframe being individually allocatable to particular ones of said up to 2N terminal equipments.
Claim 2
Independent Claim
217 words
A method of communicating on an integrated services digital network (ISDN) basic access system between terminal equipments, a network termination unit connected to the terminal equipments, and a digital subscriber line, said system supporting synchronous bi-directional digital transmission of bits organized into sequential frames, each frame comprising two sequential subframes, each subframe comprising two B-channel octets of bits and a plurality of D-channel bits, said method comprising: (a) generating in a first multiframe clock generating means at a network termination unit a first multiframe clock signal every N subframes, for identifying at said network termination unit multiframes comprising N sequential subframes, where N is an integer equal to or greater than two; (b) generating in a second multiframe clock generating means at a terminal equipment a second multiframe clock signal every N subframes, synchronized in relation to said first multiframe clock, for identifying, at a terminal equipment, multiframes comprising N sequential subframes; and (c) in response to said first clock signal, at said network termination unit and using slot interchange means exchanging particular B-channel octets of said N subframes comprised in each multiframe for transmission to and from up to 2N terminal equipments, said B-channel octets of said N subframes comprised in each multiframe being individually allocatable to particular ones of said up to 2N terminal equipments.
Claim 3
Dependent Claim
91 words
The method of claim 1 wherein step (b) comprises: (b1) in response to at least one impulse of said first multiframe clock signal, transmitting a synchronization signal, indicative of the timing of said at least one impulse, from a synchronization signal generating means to said second multiframe clock generating means on said D-channel; and (b2) in response to said synchronization signal transmitted to said second multiframe clock generating means, utilizing said second multiframe clock generating means for adjusting said second multiframe clock signal in relation to said first multiframe clock signal.
Claim 4
Dependent Claim
54 words
The method of claim 1 wherein step (c) comprises: (c1) determining the number of said 2N B-channel octets of each multiframe to allocate for transmitting to and for receiving information from each of up to 2N terminal equipments; and (c2) selectively exchanging B-channel octets from said network termination unit and said digital subscriber line.
Claim 5
Independent Claim
93 words
A method of communicating on an integrated services digital network (ISDN) comprising the steps of transmitting, in both directions between a plurality of terminal equipments and a network interface, a stream of data bits organized into multiframes, each multiframe comprising N subframes, where N is equal to or greater than two, each subframe comprising two B-channel octets, and separately allocating each B-channel octet contained in the multiframes to particular ones of said terminal equipments so that up to 2N units of terminal equipment can transmit and receive data in said data bit stream.
Claim 6
Independent Claim
93 words
A method of communicating on an integrated services digital network (ISDN) comprising the steps of transmitting, in both directions between a plurality of terminal equipments and a network interface, a stream of data bits organized into multiframes, each multiframe comprising N subframes, where N is equal to or greater than two, each subframe comprising two B-channel octets, and separately allocating each B-channel octet contained in the multiframes to particular ones of said terminal equipments so that up to 2N units of terminal equipment can transmit and receive data in said data bit stream.
Claim 7
Dependent Claim
48 words
The method of claim 4 further comprising: generating a first multiframe clock signal for identifying the boundaries of multiframes within said bit stream at a network interface; and generating a second multiframe clock signal for identifying the boundaries of multiframes within said bit stream at said terminal equipments.
Claim 8
Dependent Claim
50 words
The method of claim 5 further comprising: generating a clock synchronization signal depending on said first multiframe clock signal and transmitting said clock synchronization signal within said bit stream from said network interface to said terminal equipments and adjusting said second multiframe clock signal depending on said clock synchronization signal.
Claim 9
Dependent Claim
47 words
The method of claim 4 further comprising the steps of exchanging particular ones of said 2N B-channel octets comprised in each multiframe for transmission of data in said particular ones of said 2N B channels octets to and from corresponding ones of up to 2N terminal equipments.
Claim 10
Dependent Claim
150 words
A network termination unit, connected to a digital subscriber line and, via an S-bus, to terminal equipments, for use in an integrated services digital network supporting transmission of digital signals organized into frames, each frame comprising two subframes, each subframe having two B-channel time slots and a signaling D-channel time slot, said network termination unit comprising: first multiframe clock generating means for generating first multiframe clock pulses every N subframes, where N is an integer equal to or greater than two, for identifying multiframes comprising N sequential subframes, each multiframe having 2N B channel time slots; and slot management means, responsive to said first multiframe clock pulses, for determining the number of said 2N B-channel time slots needed by each of up to 2N terminal equipments in each multiframe and assigning particular ones of said 2N B-channel time slots to each of said up to 2N terminal equipments as needed.
Claim 11
Dependent Claim
150 words
A network termination unit, connected to a digital subscriber line and, via an S-bus, to terminal equipments, for use in an integrated services digital network supporting transmission of digital signals organized into frames, each frame comprising two subframes, each subframe having two B-channel time slots and a signaling D-channel time slot, said network termination unit comprising: first multiframe clock generating means for generating first multiframe clock pulses every N subframes, where N is an integer equal to or greater than two, for identifying multiframes comprising N sequential subframes, each multiframe having 2N B channel time slots; and slot management means, responsive to said first multiframe clock pulses, for determining the number of said 2N B-channel time slots needed by each of up to 2N terminal equipments in each multiframe and assigning particular ones of said 2N B-channel time slots to each of said up to 2N terminal equipments as needed.
Claim 12
Dependent Claim
43 words
The network termination unit of claim 8 further comprising: time slot exchange means connected to said S-bus and said digital subscriber line and responsive to said slot management means, for selectively exchanging B-channel time slots from said S-bus and said digital subscriber line.
Claim 13
Dependent Claim
70 words
The network termination unit of claim 8 further comprising clock synchronization means, responsive to at least one impulse of said first multiframe clock pulses, for generating a clock synchronization signal indicative of the timing of said at least one impulse, and for transmitting to said terminal equipments said clock synchronization signal for synchronizing remote second multiframe clocks, located at said terminal equipments, in relation to said first multiframe clock pulses.
Claim 14
Dependent Claim
23 words
The network termination unit of claim 10, wherein said clock synchronization means transmits said clock synchronization signal in said signalling D-channel time slot.
Claim 15
Dependent Claim
25 words
The network termination unit of claim 11, wherein said clock synchronization means transmits a signal which violates a Link Access Procedure format on the D-channel.
Claim 16
Dependent Claim
19 words
The network termination unit of claim 12 wherein said clock synchronization signal comprises up to six octets of bits.
Claim 17
Dependent Claim
30 words
The network termination unit of claim 12 wherein said clock synchronization signal comprises an error detecting code determined with a polynomial other than x 16 +x 12 +x 5 +1.
Claim 18
Dependent Claim
21 words
The network termination unit of claim 12 wherein said signal comprises octets with more than six logical 1 bits in sequence.
Claim 19
Dependent Claim
175 words
A terminal equipment, connected via a bi-directional S-bus to a network termination unit having a remote clock, for use in an integrated services digital network (ISDN) supporting transmission of a sequence of digital signals organized into frames, each frame comprising two subframes, each subframe comprising two B-channel time slots and a signaling D-channel time slot, said terminal equipment comprising: multiframe clock generating means for generating multiframe clock pulses, synchronized in relation to said remote clock of said network termination unit, every N subframes, where N is an integer equal to or greater than two, for identifying multiframes comprising N subframes and containing 2N B-channel time slots; and means, responsive to said multiframe clock pulses, for receiving and transmitting information on particular ones of said 2N B-channel time slots in a multiframe by extracting information from only specific B-channel time slots assigned by slot management means to said terminal equipment for receiving information and by inserting information only onto specific B-channel time slots assigned by said slot management means to said terminal equipment for transmitting information.
Claim 20
Dependent Claim
175 words
A terminal equipment, connected via a bi-directional S-bus to a network termination unit having a remote clock, for use in an integrated services digital network (ISDN) supporting transmission of a sequence of digital signals organized into frames, each frame comprising two subframes, each subframe comprising two B-channel time slots and a signaling D-channel time slot, said terminal equipment comprising: multiframe clock generating means for generating multiframe clock pulses, synchronized in relation to said remote clock of said network termination unit, every N subframes, where N is an integer equal to or greater than two, for identifying multiframes comprising N subframes and containing 2N B-channel time slots; and means, responsive to said multiframe clock pulses, for receiving and transmitting information on particular ones of said 2N B-channel time slots in a multiframe by extracting information from only specific B-channel time slots assigned by slot management means to said terminal equipment for receiving information and by inserting information only onto specific B-channel time slots assigned by said slot management means to said terminal equipment for transmitting information.
Claim 21
Dependent Claim
35 words
The terminal equipment of claim 16 further comprising timing adjustment means, responsive to a clock synchronization signal of said network termination unit, for synchronizing said multiframe clock pulses in relation to said clock synchronization signal.
Claim 22
Dependent Claim
18 words
The terminal equipment of claim 16 wherein said slot management means is located at said network termination unit.
Claim 23
Dependent Claim
202 words
An integrated services digital network (ISDN) basic access system having a network termination unit connected to a plurality of terminal equipments via a bi-directional bus and supporting bi-directional transmission of a sequence of digital bits organized into sequential frames, each frame comprising two subframes, each subframe comprising two B-channel octets of bits and D-channel bits, said system comprising: first multiframe clock generating means for generating first multiframe clock pulses every N subframes, where N is an integer equal to or greater than two; second multiframe clock generating means for generating second multiframe clock pulses, synchronized in relation to said first multiframe clock pulses, every N subframes; slot management means located at said network termination unit for determining the number of B-channel octets of each group of N subframes between first multiframe clock pulses needed by each of up to 2N terminal equipments and for assigning particular ones of said B-channel octets to said up to 2N terminal equipments; and means, located at each terminal equipment and responsive to said second multiframe clock pulses, for selectively transmitting and receiving information to and from said network termination unit on assigned B-channel time slots of each group of 2N subframes between second multiframe clock pulses.
Claim 24
Dependent Claim
202 words
An integrated services digital network (ISDN) basic access system having a network termination unit connected to a plurality of terminal equipments via a bi-directional bus and supporting bi-directional transmission of a sequence of digital bits organized into sequential frames, each frame comprising two subframes, each subframe comprising two B-channel octets of bits and D-channel bits, said system comprising: first multiframe clock generating means for generating first multiframe clock pulses every N subframes, where N is an integer equal to or greater than two; second multiframe clock generating means for generating second multiframe clock pulses, synchronized in relation to said first multiframe clock pulses, every N subframes; slot management means located at said network termination unit for determining the number of B-channel octets of each group of N subframes between first multiframe clock pulses needed by each of up to 2N terminal equipments and for assigning particular ones of said B-channel octets to said up to 2N terminal equipments; and means, located at each terminal equipment and responsive to said second multiframe clock pulses, for selectively transmitting and receiving information to and from said network termination unit on assigned B-channel time slots of each group of 2N subframes between second multiframe clock pulses.
References Cited (Backward Citations)
US4797904A
Cited
US4771418A
Cited
US4729123A
Cited
US4799217A
Cited
US4935923A
Cited
US5117425A
Cited
US4953180A
Cited
US4970723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-13 | 1998-09-12 | 1999-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-13 | 2002-09-12 | 2003-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-13 | 2006-09-12 | 2007-03-14 | $7700.00 | Window Closed / Lapsed |