3-10
Cisco uBR924 Router Hardware Installation Guide
OL-0338-01 (3/2000)
Chapter 3
Installing the Cisco uBR924 Router
Connecting Power
Figure 3-4
Backup Telephone Line Connector
Step 3
Connect the other end of the cable to the telephone wall jack.
Warning
This equipment contains a ring signal generator (ringer), which is a source of hazardous
voltage. Do not touch the RJ-11 (phone) port wires (conductors), the conductors of a
cable connected to the RJ-11 port, or the associated circuit board when the ringer is
active. The ringer is activated by an incoming call.
When the Cisco uBR924 router has a backup connection to the PSTN and the router loses power while
VoIP calls are in progress, the subscriber can establish a voice connection by dialing out over the public
switched telephone network (PSTN).
The backup POTS connection enables only one of the two VoIP lines connected to the
Cisco uBR924 router to function during a power outage. Calls in progress prior to the power outage are
disconnected. If power is re-established while a cutover call is in progress, that connection remains in
place until the call is terminated. When the call is terminated, the router automatically reboots.
Note
Calls using the backup POTS connection are made over the PSTN, not the VoIP network.
Any special features of the VoIP network are not available until power is restored and
network connections are re-established.
Connecting Power
To connect AC-input power to the Cisco uBR924 router:
Step 1
Locate the power receptacle at the rear of the cable access router. (Refer to “Verifying Power
Requirements” section on page 3-4 to verify that this power source is adequate for the router.)
Step 2
Plug the 7-pin end of the AC power supply cord into the power connector at the rear of the router.
(See Figure 3-5.)
Cable TV In
Power
Reset
Console
Line
Phone
v1+v2 v2
X
Ethernet 0
X
X
X
1
2
3
4
5V
3A
8V
0.65A
40V
7mA
Cisco uBR924
To RJ-11 phone wall jack
18513
