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ADCP-75-132 • Issue 2C • August 2006
Page 34
© 2006, ADC Telecommunications, Inc.
4.7 Coaxial Cable Connections
The RF interface between DHU and the BTS is supported through a pair of type N female
connectors mounted on the DHU front panel. One connector provides the coaxial cable
connection for the forward path (downlink) signal. The other connector provides the coaxial
cable connection for the reverse path (uplink) signal. Coaxial cables link the DHU to the BTS
through an interface device such as the HPCP or the RIU. Use the following procedure to
install the forward and reverse path coaxial cables and connect them to the DHU:
1. Obtain the required lengths of high performance, flexible, low loss 50-ohm coaxial
communications cable (RG 400 or equivalent) for all coaxial connections.
2. Route the forward path and reverse path coaxial cables (if not already routed) between
the DHU and the specified interface device (per system design) and cut to the required
length. Allow sufficient slack for dressing and organizing cables at the DHU.
3. Terminate each cable with a type N male connector following the connector supplier’s
recommendations.
4. Connect the forward path cable to the RF IN connector on the DHU front panel as
shown in Figure 18.
5. Connect the reverse path cable to the RF OUT connector on the DHU front panel.
17273-A
TYPE-N MALE CONNECTOR
RF IN CONNECTOR
(FORWARD PATH)
RF OUT CONNECTOR
(REVERSE PATH)
Figure 18. Forward and Reverse Path Coaxial Cable Connections
6. Dress and secure cables at the DHU per standard industry practice.
7. Adjust the RF signal levels and complete the remaining the forward and reverse path
coaxial cable connections as specified by the following:
Local Interface Using High Power Conditioning Panel: Refer to the High Power
Conditioning Panel User Manual (ADCP-75-175) for adjustment and connection procedure.
Remote Interface Using Remote Interface Unit: Refer to the Remote Interface Unit
User Manual (ADCP-75-178) for adjustment and connection procedure.
Local or Remote interface using ancillary interface device: Refer to Section 5.2,
Turn-Up System and Verify Operation, for adjustment and connection procedure.