Cisco Systems Connect an Isdn Line, Connecting a Cisco 811 or 813 Router to an Isdn U Line

7Connect an ISDN Line

Follow these steps to connect an ISDN U line to use the data service unit (DSU) features of the router.

Caution Always connect the red cable to the red ISDN U port on the router. Do not connect either cable to the yellow Ethernet port. Accidently connecting these cables to the wrong port can damage your router.

Figure 3 Connecting a Cisco 811 or 813 Router to an ISDN U Line

TO HUB
TO PC	ETHERNET 10
		BASE T
	1
	2	3

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Cisco 813 router

Model Cisco 813 CONSOLE ISDN S/T

NOR RVS

DSU ON OFF

ISDN U		+5, -	-71
	PHONE	24,		VDC
ISDN U	1
		2

ISDN wall jack

Step 1 Connect the red cable with the RJ-11 connector to the red ISDN U port.

Step 2 Connect the other end of the cable to the ISDN wall jack with an RJ-11 connector.

Step 3 Verify that the DSU button is set to the ON position.

Step 4 Check the DSU LED on the front panel after router power-up. If the DSU LED is not on, try pressing the NOR/RVS button.

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