Eicon Networks ISDN NT1 Specifiche Scaricare il pdf (Pagina 21)

This would appear to present no problem for the ISDN which is digital and can therefore

carry the data passed into the modem (which is digital as well).

The next step in evolving this configuration is to use an internal modem in the PC.

Logically this is no different from the previous scenario.

We could replace the internal modem with an internal ISDN adapter and a driver which

appears to the application software to be a modem. In reality, this driver combines the

functions of both the modem and the CODEC. This driver is known as a soft modem.

A soft modem requires a lot of processing power, since it has to operate in real time. The

PC is therefore likely to appear a bit sluggish while the connection is active. The

advantage of this solution is that it can be used with an inexpensive passive ISDN adapter.

The final step in evolving this scenario is to use an ISDN adapter with has a DSP (Digital

Signal Processor). This takes the very heavy processing load due to the soft modem away

from the PC. ISDN adapters with a DSP a generally more expensive than passive

adapters.

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Eicon Networks ISDN NT1 Specifiche Pagina 21