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7
Connect an ISDN Line
Follow these steps to connect an ISDN U line to use the data service unit (DSU) features of the router.
Always connect the red cable to the red ISDN U port on the router. Do not connect either cable to the yellow
Caution
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 HU B
TO PC
M o d el C
ET HE RN
ET 10 BA
is co 8 1 3
SE T
CO NS OL
E
IS DN S/
NO R
T
RV S
1
2
3
ON
4
OF F
Cisco 813 router
Connect the red cable with the RJ-11 connector to the red ISDN U port.
Step 1
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.
6
IS DN U
+5 , -2 4,
DS U
-7 1 VD C
PH ON E
IS DN U
1
2
ISDN wall jack
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