Modems software hsp

Last modified on Skip to: content search login. Knowledge Base Toggle local menu Menus About the team. Knowledge Base Search. Log in. There are many variations on the design of WMs, and I'm not familiar with all of them. Personally, I'm still skeptical enough about WMs that I'd tend to avoid WMs that are not Lucent-based, but the LT product has me convinced that Ed's statement above is correct - and, that the Lucent-based product is "well designed".

Note though that many companies make WMs based upon the Lucent chipset, and they probably aren't all the same in terms of quality and design. There are differences in the designs of WMs. The modem is little more than a cheap chip and software, and should be avoided! The better design has a powerful DSP chip effectively a CPU on the modem, and the host processor has a significantly lower load.

Yes, some detractors insult the WM name by implying it is not a real modem. A "real" modem has a controller and interfaces to a PC or other device that outputs asynchronous serial data - through a COM port on a PC. The modem hardware then does all sorts of processing to this data, to convert it to the analog phone line output representing synchronous serial frames of data conforming to the protocols in use. A WM doesn't actually use a COM port, but since all modem application software is designed to use a COM port, the WM driver emulates a physical port so that communications software applications will work.

In a "well-designed" WM, the extra load on the CPU to do the processing a "real modem" performs is substantially offset by eliminating CPU load involved in the transfer of data over the COM port to a "real modem". The modulator modifies some characteristic of the carrier which is the action of modulating , so that a signal is obtained, which includes the information of the modulator.

Thus the demodulator can recover the original modulating signal, removing the carrier. The characteristics that can be modified from the carrier signal are:. A combination of more complex modulations or modulations such as quadrature amplitude modulation is also possible. They consist of an expansion card on which the different components that make up the modem. They exist for various types of connector:. The main advantage of these modems lies in their greater integration with the computer, since they do not take up space on the table and receive electricity directly from the computer itself.

On the contrary, they are somewhat more complex to install and information about their status can only be obtained by software. Similar to the previous ones, but external to the computer or PDA. The advantage of these modems lies in their easy. On the contrary, and obviously, they take up more space than inmates. Device of a certain level of intelligence. The most current consist of a microprocessor and a memory.

Memory : Used to store the phone numbers that the modem can dial automatically when requested by the user. Automatic number dialing : This function allows the user to dial a telephone number using the workstation or PC keypad, instead of using the telephone keypad.

Automatic answer : Provides the station with the possibility of answering a call without any user intervention. Automatic call : Allows the user to leave messages to be sent at a specific time and date, to a specific place. Callback : When the modem answers a call, it checks the identity of the sender on a previously established list of authorizations.

If the sender is authorized, the modem cuts off the call and then automatically calls the user to the telephone number indicated in the list. Automatic repetition of a number : Redial the number that was last called, without requiring the user to redial the number. Autologon : automatically enter the password to access other signals necessary to identify a user with a remote computer.

It is usually done through one of the traditional serial ports or COM RS , so the UART of the computer is used , which should be able to provide sufficient communication speed. The UART must be or higher so that the performance of a modem of 28, bps or more is adequate.

These modems need a plug for your transformer.