Toshiba Satellite 1130-Z29 Modem Driver
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Toshiba Satellite 1130-Z29 Modem Driver
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Discuss Abstract A cable television system and method in which each subscriber's converter is located outside the subscriber's premises in an external control unit "ECU" which also includes several other sub-scribers' converters. In addition to television sig-nals, the cable network transmits control and data signals in both directions between the ECU and the head end of the system and between the ECU Toshiba Satellite 1130-Z29 Modem each subscriber.
Each subscriber supplies a portion of the power required by the associated ECU. Multiple television channels can be supplied to each sub-scriber via a single drop cable connecting the sub-scriber to the ECU.
Background of the Invention This invention relates to cable television systems, and more particularly to cable television systems in which the converter for converting Toshiba Satellite 1130-Z29 Modem of the television signal on the cable network to the television signal Toshiba Satellite 1130-Z29 Modem is applied to the subscriber's television receiver is located outside the subscriber's premises.
There is increasing interest in cable tele-vision systems in which the converter for converting the portion of the cable television signal which the subscriber desires to receive to a signal suitable far application to the subscriber's television set is located outside the subscriber's premises, for example, on or adjacent to a neighboring utility or telephone pole. This is of interest because it re-duces the risk of unauthorized tampering with the converter, accidental or intentional misappropria-tion of or damage to the converter, and the like.
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On the other hand, locating the converter outside the Toshiba Satellite 1130-Z29 Modem premises increases the com-plexity and cost of the system because apparatus must then be included in the system to enable the subscriber to remotely control the converter. It is therefore an object of this inven-tion to improve, simplify and reduce the cost of cable television systems with off-premises converters.
Summary of the Invention This and other objects of the invention are Toshiba Satellite 1130-Z29 Modem in accordance with the principles of the invention by providing a cable television system and method in which the off-premises conve-r-ters of several adjacent subscribers are at least partially controlled by common signal processing circuitry associated with those converters.
The common signal processing circuitry and all the asso-ciated converters are preferably located in a common facility, for example, Toshiba Satellite 1130-Z29 Modem housing mounted on or adja-cent to a utility pole neighboring the premises of the associated subscribers. This apparatus is referred to herein as an external control unit or "ECU". The signals derived from this tap are distributed appro-priately to the components of the ECU.
A drop cable extends from the ECU to each subscriber's premises. Inside the subscriber's premises the drop cable is connected to a subscriber processing unit or "SPU" which is typically located adjacent to the subscriber's television receiver.
The SPU applies the television signal on the drop cable to the tele-vision receiver and also applies subscriber-originated control signals to the drop cable for Toshiba Satellite 1130-Z29 Modem back to the ECU. Other devices located in the sub-scriber's premises, such as burglar, fire and other alarm or monitoring equipment capable of applying control signals to the drop cable for transmission back to the ECU, can also be connected to the drop cable.
The ECU processes the control signals originated by all of the associated subscribers to satisfy, if appropriate, the service requests indi-cated by those control signals. In particular, the common signal processing circuitry in the ECU is used as extensively as possible to process the subscriber-originated control Toshiba Satellite 1130-Z29 Modem to minimize the amount of separate ECU circuitry which must be provided for each subscriber.
The Toshiba Satellite 1130-Z29 Modem is also capable of receiving and responding to control signals from the so-called "head end" of the cable network. For example, these control signals may include channel authorization data identifying which channels on the cable network a particular subscriber is authorized to receive and view. These head-end-originated control signals are preferably transmitted via the cable network, and the common signal processing circuitry in each ECU is again used as Toshiba Satellite 1130-Z29 Modem as possible to process these signals.
Because each ECU typically serves several subscribers, all of those subscribers can be serviced from the head end by control signals ad-dressed to the ECU rather than to each subscriber individually. This greatly facilitates control of the system from the head end.
Further features of the invention, its nature and various advantages will be more apparent from the accompanying drawing and the following detailed description of the invention. Brief Description of the Drawing Figure 1 is a block diagram of a cable television system constructed in accordance with the lnventlon. Figure 3 is a block diagram of the analog unit in the apparatus of Figure 1. Figure 4 is a schematic Toshiba Satellite 1130-Z29 Modem diagram of the communication unit in the apparatus of Figure 1.
Figures 5a-5i, which are connected togeth-er as shown in Figure 5j, are collectively a schematic block diagram of the digital unit in the apparatus of Figure Toshiba Satellite 1130-Z29 Modem.
CAC - Cable television system - Google Patents
Figures 5k-5s are collectively a schematic diagram Toshiba Satellite 1130-Z29 Modem the gate array shown in Figure 5c. Figures 5a-5s are sometimes collectively referred to as Figure 5. Figure 6 is a schematic diagram of the common power unit in the apparatus of Figure 1. Figure 7 is a schematic block diagram of the "SPU" in the apparatus of Figure 1.
Figure 8 is a block diagram of the central control computer "CCC" and modem of the headend in the apparatus of Figure 1. Figures 9a-b Toshiba Satellite 1130-Z29 Modem flow charts illustrating the flow of a program controlling the operation of the so-called Drop Processor of the ECU. Figures lOa-b are diagrams of basic message formats used in an embodiment of the invention for data communication in the forward direction from the CCC to an ECU.
Figure 11 is a diagram of a basic message format used in an embodiment of the invention for data communication in the reverse direction from an ECU to the CCC.
Figure 19 is a diagram of a basic message format used in another embodiment of the invention for data communication in the forward direction from the CCC to an ECU.