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3  

Connect Your Small Cell

Follow these instructions to connect your USC 3331 for use:

Step 1

Connect one end of the network cable to the small cell Ethernet port and the 
other end to your broadband router or cable modem.

Step 2

Connect the power adapter to the power port and to an AC power source.

Step 3

Flip the power switch up to turn the unit ON.

Step 4

Wait ten minutes for your small cell to be ready to use. 

The status LED stops flashing green and becomes solid green when your 
small cell is ready to use.

Figure 1

Cisco USC 3331 Connections

1

2

3

4

5

381908

1

Status LED

4

Power port

2

Reset button

5

10/100 Base-T Ethernet port

3

Power switch

4  

Verify Your Small Cell Operation

The LED display is located on the side of your small cell. Note the color and activity 
of the LEDs and refer to this table to diagnose any problems: 

Table 1

USC 3331 Status LED Indications 

LED Indication

Small Cell State / Action

Off

No power—Ensure power supply is connected and turned on

Fast Green

Initialization or provisioning—Wait for action to complete

Green

In service, no calls or data sessions—Ready to support calls

Slow Green

In service with active calls or data sessions

Red blink 1 time 
in 4 seconds 

No connection to local broadband router—Verify connection 
between broadband router and small cell, and verify that the 
broadband router is operational

Red blink 2 times 
in 4 seconds 

No Internet connection—Verify that the broadband router is 
connected to the Internet and is providing service

Red blink 3 times 
in 4 seconds 

Interference with other systems—Try placing your small cell in 
a different place. If this problem persists, contact customer 
support

Red blink 4 times 
in 4 seconds 

Overheating—Verify that the small cell is located where there is 
proper air flow

Red

Initial boot—Wait up to 20 minutes; if still red, perform a reset

Cannot create secure connection—Contact customer support

Internal fault—Contact customer support

RF issue, cannot select an RF profile—Verify whether another 
small cell is located in close proximity and if so, relocate unit

Provisioning failure—Contact customer support

5  

Safety Instructions

Translated versions of the following safety warnings are provided in 

Cisco USC  3331 

Regulatory Compliance and Safety Information

, located on Cisco.com.

Warning

IMPORTANT SAFETY INSTRUCTIONS

This warning symbol means danger. You are in a situation that could 
cause bodily injury. Before you work on any equipment, be aware of the 
hazards involved with electrical circuitry and be familiar with standard 
practices for preventing accidents. Use the statement number provided 
at the end of each warning to locate its translation in the translated 
safety warnings that accompanied this device. 

Statement 1071

SAVE THESE INSTRUCTIONS

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