3Com 10014299 manual DCC Overview, Terms in DCC Configuration

51 CONFIGURING DCC

This chapter covers the following topics:

■DCC Overview

■Configuring DCC

■Displaying and Debugging DCC

■DCC Configuration Examples

■Troubleshooting DCC

DCC Overview

Terms in DCC

Configuration

Dial Control Center (DCC) is the routing technique adopted when the routers interconnect via a PSTN (Public Switched Telephone Network) or ISDN (Integrated Services Digital Network). In DCC, the routers are interconnected through PSTN. The connections are established through dialing when data transmissions are required. A DCC dialing is required to set up a link for transmitting information. When the link becomes idle, the link established by DCC will be automatically disconnected.

Under certain circumstances, routers establish connections for communications to satisfy specific requirements. Therefore, the data transmission are time-independent, burst and in small size. DCC provides a flexible, economical, and efficient solution for such applications. In practice, DCC guarantees the priority of communications through designated backup lines. In the case that a primary line for normal communications become unavailable for any reasons, DCC uses the designated backup channels to carry out the communications to assure the required services are timely completed.

Frame Relay network through a leased line. To reduce the cost, you can adopt frame relay over ISDN to access the frame relay network through ISDN line. Meanwhile, ISDN network can act as the backup of frame relay network.

The following terms are commonly used in DCC configurations:

■Physical interface: The physical interface that actually exists, like the serial, BRI, asynchronous, and AM interfaces.

■Dialer interface: Logical interface set for configuring DCC parameters. A physical interface can inherit the DCC configuration after it is bound to the dialer interface.

■Dial interface: A general term describing an interface for dialup connection. It can be a dialer interface, a physical interface bound to the dialer interface, or a physical interface directly configured with DCC parameters.