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DATA COMMUNICATIONS CONFIGURATIONS 9-7

_ ______________________________________________________________________________________

SWITCHED

DIGITAL

NETWORK

PICTURETEL

ACCUNET

MPDM*

ACCUNET

MPDM*

SYSTEM 75/

SYSTEM 85/

GENERIC 1/

GENERIC 2

DS1

ACCUNET

MPDM*

ACCUNET

MPDM*

SYSTEM 75/

SYSTEM 85/

GENERIC 1/

GENERIC 2

*Also called MPDM/M1*.

Figure 9-4. A Possible Teleconferencing Conﬁguration

Image Processing

CAD/CAE and medical imaging applications may require the transmittal of an image cross-country. These

applications can use either public, switched (ACCUNET Switched Digital Service or Software-Deﬁned

Digital Network) or private, nonswitched (ACCUNET T1.5 or ACCUNET Spectrum) facilities for image

transmission from site to site. Figure 9-5 shows a typical conﬁguration.

FAX Transmittal

Group 3 facsimile is used for stand-alone and person-to-person communication; while Group 4 — whose

applications include electronic mail, optical character recognition, and document transmittal and storage —

is better suited for computer-controlled network communication. Group 3 FAX is typically sent over the

public voice network and provides analog transmission at speed up to 9.6 kbps; while Group 4 demands

64-kbps ISDN-PRI facilities. The ACCUNET Switched Digital Service or the Software-Deﬁned Digital

Network can provide Group 4 FAX transmittals through their SW64 service. The ACCUNET Packet Service

can be used for these transmittals if a packet assembler/disassembler in inserted in the communications

stream immediately before and after the transmissions are processed through the network. Private,

nonswitched ACCUNET T1.5 or ACCUNET Spectrum facilities can also be used.

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Att DEFINITY 7200 series Bedienungsanleitung Seite 197