 Method and communication network for offering announcements |
| OF THE PREFERRED EMBODIMENTS The communication network and method according to the present ... |
|
| Path discovery method for return link communications between a mobile platform and a base station |
| The present invention relates to a system and method for enabling a mobile platform communicating ... |
|
| Management of certificates for public key infrastructure |
| Thus the present invention seeks to circumvent or overcome the above mentioned problems of ... |
|
| Switch system for switching extension numbers |
| It is therefore an object of the present invention to provide a method and system for changing or ... |
|
| Incoming call tracking with interactive data collection |
| We claim: 1. In a public switched telephone network comprising a plurality of subscriber telephone ... |
|
| System and method for managing a telecommunications network by determining service impact |
| The present invention is directed to a method and apparatus for analyzing service impacts on ... |
|
| Method and system for providing regional information |
| The present invention is intended to extensively utilize the map information retrieval display ... |
|
| Model-based coding/decoding method and system |
| In the light of the foregoing problems associated with the prior art, it is a first object of the ... |
|
| Distributed signaling message routing in a scalable wireless communication system |
| In order to overcome the described shortcomings of prior wireless communication systems, among ... |
|
|
Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with programmable current limiting
| Details |
Inventors: Dupuis, Timothy J.; Tuttle, George Tyson; Scott, Jeffrey W.; Sooch, Navdeep S.; Welland, David R.;
Assignee: Silicon Laboratories Inc. (Austin, TX)
Primary Examiner: Le; Amanda T.
Assistant Examiner:
Attorney, Agent or Firm: O'Keefe, Egan & Peterman, LLP
A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines. Briefly described, the DAA provides a programmable means for the DC termination for a variety of international phone standards. The invention may also be utilized with means for transmitting and receiving a signal across a capacitive isolation barrier. More particularly, a DC holding circuit is provided in which a programmable DC current limiting mode is available. In the current limiting mode, power may be dissipated in devices external to a DAA integrated circuit. Moreover, much of the power may be dissipated in external passive devices, such as resistors. |
|
DETAILED DESCRIPTION We claim: 1.
A communication system, comprising: phone line side circuitry capable of being coupled to phone lines; powered side circuitry capable of being coupled to the phone line side circuitry through an isolation barrier; and a DC holding circuit within the phone line side circuitry, the DC holding circuit being programmable in response to data transmitted across the isolation barrier to operate the DC holding circuit in a plurality of modes, the DC holding circuit operable in at least a first mode to meet a first phone line interface standard and a second mode to meet a second phone line interface standard, the second phone line interface standard having a DC current limit requirement.
2.
The communication system of claim 1, the DC holding circuit comprising a phone line side integrated circuit and at least one external device, the external device dissipating more power in the second mode than in the first mode.
3.
The communication system of claim 2 wherein a substantial portion of the power dissipated by the DC holding circuit in the second mode is dissipated external to the phone line side integrated circuit.
4.
The communication system of claim 3, wherein 50% or more of the power dissipated by the DC holding circuit is dissipated external to the phone line side integrated circuit.
5.
The communication system of claim 4, wherein 50% or more of the power dissipated by the DC holding circuit is dissipated in one or more passive external devices.
6.
The communication system of claim 5, wherein the one or more passive external devices are one or more resistors.
7.
The communication system of claim 1, further comprising the isolation barrier coupled between the phone line side circuitry and the powered side circuitry, the isolation barrier being a capacitive barrier.
8.
The communication system of claim 1, wherein the phone line side circuitry and the powered side circuitry are configured to communicate across the isolation barrier through digital signals.
9.
The communication system of claim 8, further comprising the isolation barrier coupled between the phone line side circuitry and the powered side circuitry, the isolation barrier comprising one or more capacitors
|
| Related patents |
|
|
Startup protocol for high throughput communications system
Briefly, and in general terms, the invention relates to methods of enabling the transmission and reception of signals through unshielded twisted pairs of wires within a ...
|
|
|
Method for determining the quality of mobile radiotelephone units in a mobile radiotelephone network
What is claimed is: 1. A method for determining the quality achieved by different components in a mobile radio network, comprising: determining a quality parameter which ...
|
|
|
Communication system
The present invention advances the art by providing a communication system that integrates multiple layers of wireless systems including a free-space laser device to ...
|
|
|
Packet switching with common time reference over links with dynamically varying delays
The invention describes a method for transmitting and forwarding packets over a packet switching network where the delay between two switches increases, decreases, or ...
|
|
|
Apparatus and method of in-service audio/video synchronization testing
An object of the invention is an in-service apparatus and method of non-intrusively measuring audio/video synchronization of a television broadcast across an analog, ...
|
|
|
Hi-fidelity line card
In accordance with an illustrative embodiment of the present invention, a high-fidelity voice/audio communication system is provided. According to an aspect of the ...
|
|
|
Set-top box with out-of band modem and cable modem
What is claimed is: 1. An apparatus for combining upstream and downstream signals in a television set-top box, comprising: a cable interface interfacing to a cable ...
|
|
|
Determining the presence of IP multicast routers
In recognition of the above-described difficulties, the present disclosure, in one embodiment, describes a method for determining the presence of the multicast routers ...
|
|
|
Application and communication platform for connectivity based services
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular circuits, circuit components, ...
|
|
|
Call-based provisioning of mobile equipment location information
Methods, systems, and arrangements enable a mobile equipment (ME) to provide notification when a preselected number is called. In accordance with certain embodiment(s), ...
|
|
|
Cell Phones 
