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| Semiconductor integrated circuit device |
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| Emitter-coupled logic circuit |
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| Apparatus and method for reducing power consumption in a computer system |
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Equalization system for modems in a polled arrangement
| Details |
Inventors: Stuart, Richard L.;
Assignee: Rixon, Inc. (Silver Spring, MD)
Primary Examiner: Safourek; Benedict V.
Assistant Examiner:
Attorney, Agent or Firm: Saidman, Sterne, Kessler & Goldstein
In a system in which a central modem individually polls a number of remotely located modems for data, an adaptive equalizer in the central modem is initially trained to minimize communication link interference from a remote modem and develops a set of equalizer coefficients based on the initial training which is transmitted to the remote modem and stored there for future use while the central modem goes on to do the same with other remote modems. When a remote modem is polled, the stored equalizer coefficients are used to set the adaptive equalizer of the remote modem so the adaptive equalizer of the central modem does not have to be retrained for each individual remote modem. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG.
1, a data processor 1 is connected to a plurality of remote modems 3a, 3b, 3c .
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.
3n via a central modem 5.
Each of the remote modems 3a-3n has associated with it a data station 7a, 7b, 7c .
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7n, which for example can be a data entry terminal, video display unit, remote data acquisition device, etc.
Each data station 7a-7n is characterized by having the capability of generating and/or receiving digital data.
Since this digital data cannot be transmitted directly over a data transmission channel, such as a telephone line, each remote modem 3a-3n acts to convert these digital signals to a form which can be transmitted over each remote modem's associated data transmission channel 9a, 9b, 9c .
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9n.
For example, frequency modulation, phase modulation or amplitude modulation schemes which are well-known can be used to impress the data over a band limited telephone line.
The signals transmitted from the remote modems over their respective transmission channels are applied to a polling device 11 which is connected to central modem 5.
The polling device periodically looks at each of the data transmission channels 9a-9n to see if a transmitted signal is present.
If data is present the polling device will lock onto the channel and allow data from the transmitting remote modem to be applied to central modem 5.
When data transmission is complete, the polling device will recommence its polling of the data transmission channels until another data present signal is detected.
If it is desired to send a signal from the central modem to a particular remote modem, the polling device is given the address of the desired remote modem and selects the appropriate data transmission channel.
Control of the polling device's operation can be by means of a logic sequencing unit or processor incorporated as part of the polling device, or can be done externally under the control of a data processor.
As will be recognized, in a polled modem arrangement where the data sources or terminals 7a-7n are connected over data transmission channels 9a-9n which may be part of a dial-up telephone network, the quality of each of the data transmission channels can vary from channel to channel
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CPUs 
