ADTRAN TSU IQ+, 1204002L2 user manual DBU Application 2 PRI, PRI DBU Card at Host Site

Chapter 4. Applications

DBU Application 2 (PRI)

The following application shows the critical configuration for a case where the Host Site of the frame relay circuit is set up to restore service (see Figure 4-7). This setup uses a PRI ISDN module and service so that multiple calls can be placed simultaneously. The criteria for placing a call are based on Host Site port failure or individual PVC failure. The individual PVC failure should account for remote sites port outages and frame relay service troubles.

						TSU IQ+	SITE B
						NET	Router
			16	100		DTE	LAN
					BRI
			17	101		DBU
	SITE A	TSU IQ+
	Router	NET	Frame Relay
LAN		DTE	20	201		TSU IQ+
							SITE C
		DBU
						NET
							Router
		PRI			BRI	DTE	LAN
		ISDN or				DBU
		POTS Network
					Figure 4-7. PRI DBU Card at Host Site

Table 4-3, Table 4-4, and Table 4-5 on page 4-15 show example setups for PRI DBU options at the Host Site. These tables are based on the example application shown in Figure 4-7.

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