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US4075432A
Expired / Lapsed
US
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Telephone concentrator
Assignee: LANNIONNAISE D ELECTRONIQUE SLE CITEREL S A Ste
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Filing: 1976-11-11
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Granted: 1978-02-21
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Expires: 1996-11-11
Abstract
Abstract A concentrator for use in a PCM telephone network. The concentrator has conventional units such as line equipments, a space concentration network and a coder/decoder-PCM sampler and additionally includes a time cross-connection network and two different types of junctors, one type being a complete junctor and the other type (a simplified type) conducting only during the conversation part of a call. The concentrator therefore arranges firstly for a normal junctor to set a call up, then subsequently releases it, substituting it by a simplified junctor. This substitution causes a complementary modification of the time connection in the time connection network to keep the same connection channel with the exchange.
Inventors
- 👤 Yves Renaudin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:23
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
168 words
In a line concentrator for use in a telecommunications system to connect analog subscriber lines to a PCM exchange and including a successive connection of a plurality of subscriber line equipments, at least one spaceswitched concentration network, junctors, and coder/decoders for analog/digital and digital/analog conversion, the improvements characterized by: said junctors comprising at least two different types including a "simplified" type capable of transmitting conversation but incapable of setting up a call and a "complete" type which is also capable of setting up a call, the concentrator including control means for selecting a complete junctor during the setting up of a call through the concentrator and for switching said call through a simplified junctor once the call is established, the coder/decoders being followed in the successive connection by a time-switched connection network for changing the multiplex time channel of said call in response to the change of junctors so that the same multiplex time channel is used throughout a call both before and after switching of the junctor.
Claim 2
Dependent Claim
168 words
In a line concentrator for use in a telecommunications system to connect analog subscriber lines to a PCM exchange and including a successive connection of a plurality of subscriber line equipments, at least one spaceswitched concentration network, junctors, and coder/decoders for analog/digital and digital/analog conversion, the improvements characterized by: said junctors comprising at least two different types including a "simplified" type capable of transmitting conversation but incapable of setting up a call and a "complete" type which is also capable of setting up a call, the concentrator including control means for selecting a complete junctor during the setting up of a call through the concentrator and for switching said call through a simplified junctor once the call is established, the coder/decoders being followed in the successive connection by a time-switched connection network for changing the multiplex time channel of said call in response to the change of junctors so that the same multiplex time channel is used throughout a call both before and after switching of the junctor.
Claim 3
Dependent Claim
15 words
A concentrator according to claim 1, wherein the time-switched connection network is a concentration network.
Claim 4
Dependent Claim
18 words
A concentrator according to claim 1, wherein the time-switched connection network serves at least two space-switched concentration networks.
Claim 5
Dependent Claim
63 words
A concentrator according to claim 1, wherein the simplified junctors are arranged to feed the subscriber line equipments with "reversed" polarity line current whereas the complete junctors enabling a call to be put through have means for feeding the subscribers' sets with a current, for reversing the polarity of the current and for injecting the ringing current and the trunk call charge signals.
Claim 6
Dependent Claim
27 words
A concentrator according to claim 2, wherein the complete junctors include line current feed means, line feed reversing means, ringing current supply means and tone feeding means.
Claim 7
Dependent Claim
17 words
A concentrator according to claim 5, wherein the tone feeding means comprises a supply of pay tone.
References Cited (Backward Citations)
US3676855A
Cited
US3825690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |