Att DEFINITY 7200 series Manual de usuario descargar pdf (Pagina 192)

9-2 DATA COMMUNICATIONS CONFIGURATIONS

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DSC AND PSC CONNECTIONS

The dedicated switched connection (DSC) is a feature that provides a dedicated path using circuit-switched

facilities on the System 85 (R2V4) and Generic 2 communications system; the permanent switched

connection (PSC) offers a similar capability on the System 75 and Generic 1.1 communications systems.

DSC and PSC are implemented through communications system administration. No extra hardware is

required.

DSCs and PSCs provide a clear channel through the communication system to connect two ports when

dialed number signaling is not provided on the incoming port. The channel runs at rates up to 64 kbps. A

variety of ports types may be connected through the dedicated communications-system path. They include:

• Analog line and trunk ports

• DCP ports (digital-line ports on the System 75 [R1V2 and later] and Generic 1 communications system

and GPP ports on the System 85 [R2V4] and Generic 2 communications system)

• EIA ports

Note: For EIA connections on the System 85 (R2V4), the bearer capability must be set to 2 on the trunk

group used for the connection. Set the bearer capability through PROC 103, ﬁeld 15.

• DS0 channels of DS1 ports

Figure 9-1 depicts some typical DSC and PSC conﬁgurations. Other conﬁgurations are possible.

Note that:

• 24th-channel signaling and B8ZS line coding are required for certain dedicated (PSC and DSC) data

connections through the communications system.

• When a dedicated connection must be implemented between a System 75 or Generic 1 endpoint, and a

System 85 or Generic 2 endpoint, the connection should be implemented as a PSC on the System 75 or

Generic 1 communications system. Because PSCs can be established across communications systems,

no DSC is necessary on the System 85 or Generic 2 communications system when the PSC is deﬁned

on the System 75 or Generic 1.

• On the System 75 and Generic 1 communications system, PSCs can be deﬁned at either of two

administration screens: the Permanent Switched Connection screen or the Interface Link screen. PSCs

established through the Interface Link screen are more properly called software connections, rather than

PSCs.

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Att DEFINITY 7200 series Manual de usuario Pagina 192