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4-3
D-620003-0-20 Rev J
CONFIDENTIAL
Expansion Hub Front Panel
4.1.1
RJ-45 Connectors
The eight RJ-45 connectors on the Expansion Hub are for the Cat-5/5E/6 ScTP cables
used to transmit and receive signals to and from RAUs. Use shielded RJ-45 connec-
tors on the Cat-5/5E/6 cable.
NOTE:
For system performance, it is important to use only Cat-5/5E/6 ScTP
(screened twisted pair) cable with shielded RJ-45 connectors.
Cat-5/5E/6 cable also delivers DC electrical power to the RAUs. The Expansion
Hub’s DC voltage output is 36V DC nominal. A current limiting circuit protects the
Expansion Hub if any port draws excessive power.
4.1.2
Optical Fiber Uplink/Downlink Connectors
The optical fiber uplink/downlink port transmits and receives optical signals between
the Expansion Hub and the Main Hub using industry-standard SMF or MMF cable.
The fiber port has two female SC/APC connectors:
• Optical Fiber Uplink Connector
This connector (labeled
UPLINK
) is used to transmit (output) uplink optical signals
to the Main Hub.
• Optical Fiber Downlink Connector
This connector (labeled
DOWNLINK
) is used to receive (input) downlink optical sig-
nals from the Main Hub.
CAUTION:
To avoid damaging the Expansion Hub’s fiber connector
ports, use only SC/APC fiber cable connectors. Additionally, use only
SC/APC fiber connectors throughout the fiber network, including fiber
distribution panels. This is critical for ensuring system performance.
4.1.3
LED Indicators
The unit’s front panel LEDs indicate fault conditions and commanded or fault lockouts.
The LEDs do not indicate warnings or whether the system test has been performed.
Only use the LEDs to provide basic information or as a backup when you are not using
AdminManager.
Upon power up, the Expansion Hub goes through a five-second test to check the LED
lamps. During this time, the LEDs blink through the states shown in Table 4-2, letting
you visually verify that the LED lamps and the firmware are functioning properly.
NOTE:
Refer to Section 9 for troubleshooting using the LEDs.
