Cisco 8831NR Administration Manual page 109

Features, Templates, Services, and User Setup
In Linked Mode, the primary base station supports either one wireless or one wired microphone. The secondary
unit supports only one wired microphone. You cannot mix microphone kits: if you plan to connect a microphone
to both sound bases, they must both be wired microphones.
The Cisco Unified IP Conference Phone 8831 supports wired and wireless microphones. The Cisco Unified
IP Conference Phone 8831NR supports only wired microphones.
The voice, dial tone, ringer, and base LED features synchronize between the two devices when linked together.
You can link two sound bases while a call is active.
When Linked Mode is active, the linked mode icon displays in the idle and the call screens.
The following table summarizes the best practice to follow when deploying your conference phones in Linked
Mode. If the devices are linked in this manner, the system software automatically detects which device is to
be used as the primary and which is the secondary one.
Table 31: Linked Mode Setup Best Practice
Component
Display Control Unit (DCU)
Network cable
Wall power
Optional Wired Microphone
Optional Wireless Microphone
Note If a DCU is connected to the secondary device, it will display a prompt indicating that it is a dummy DCU,
but will otherwise not function.
Caution When using a Sound Base in Linked Mode, the primary base unit must be connected using the
CP-PWR-CUBE-3 external power supply.
If two devices are linked after both are registered, the user can select which is the primary device.
A secondary device receives upgrades to firmware seamlessly from the primary device.
Link Conference Phones
Use a daisy cable to connect two sound base units in Linked mode. This procedure describes the best practice
for connecting the two units.
Procedure
Step 1
Connect the DCU to the conference phone to be used as the primary unit.
Step 2 Connect the network cable to the conference phone to be used as the primary unit.
Step 3
Connect the power cable to the primary device and plug into a wall plug.
Connect to Primary
Yes
Yes
Yes
Yes
Yes
Cisco Unified IP Conference Phone 8831 and 8831NR Administration Guide
Link Conference Phones
Connect to Secondary
No
No
No
Yes
No
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