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ISDN adapter card

In order to be able to carry out data transmissions via ISDN with a personal computer( PC) or a workstation, the terminal equipment must be extended in terms of hardware. This extension can take the form of an internal ISDN adapter card, an external adapter or a PCMCIA card.

For internal adapter cards, a general distinction is made between passive and active cards. Passive cards require some of the PC's computing power for control, since they do not have their own processor. Active cards are equipped with appropriate central processing units( CPU) and memories that perform communication control, compression and data backup. A basic feature of the adapter card is, of course, the bus structure used in the end device, which is concept-specific. For personal computers it is a PCI bus, ISA bus or EISA bus.

All manufacturers of ISDN adapter cards support the S0 interface, some also the primary multiplex interface, which can be used for LAN connections. In terms of service and software support, adapter cards include data compression and backup, base channel bundling, modem and COM port emulation, fax group 3 support, and support for multiple D-channel protocols and V.100 and V.120 bit rate adaptation.

The main tasks of the ISDN adapter cards include the implementation of the communication protocols in the D-channel and in the B-channels. Voice transmission takes place via the a/b interface and computer telephony integration( CTI) via the so-called X interface.

Informations:
Englisch: ISDN adapter card
Updated at: 06.11.2006
#Words: 235
Links: indium (In), order, data, vertical interconnect access (PCB) (via), integrated services digital network (ISDN)
Translations: DE
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