ADC 19717-A 2.2RF Signal Connections, 2.3Optical Connection, 2.4Controller Area Network Interface Connection, 2.5Service Interface Connection, 2.6Powering

ADCP-75-169 • Issue 1 • June 2004

2.2RF Signal Connections

The RF signal connections between the HU and the EBTS are supported through either two (non-diversity unit) or three (diversity unit) N-type female connectors. On non-diversity units, one connector is used for the forward path RF signal. The other connector is used for the reverse path RF signal. On diversity units, a third connector is used for the diversity path RF signal. In installations where multiple EBTS’s will be connected to a single HU, it will usually be necessary to install a Primary Interface Panel and an Expansion Panel (accessory items) to support the interface between the HU and the EBTS. The HU should be as close as possible to the EBTS to minimize cable losses.

2.3Optical Connection

Optical connections between the HU and the RU (STM) are supported through either two (non- diversity unit) or three (diversity unit) SC-type optical connector ports. On non-diversity units, one port is used for connecting the forward path optical signal and the other port is used for connecting the primary reverse path optical signal. On diversity units, a third optical port is used for connecting the diversity reverse path optical signal.

2.4Controller Area Network Interface Connection

Controller Area Network (CAN) interface connections between multiple HU’s are supported by a pair of RJ-45 jacks. One of the jacks is designated as the network IN port and the other jack is designated as the network OUT port. The CAN interface allows up to 24 HU’s to be connected together (in daisy-chain fashion) and controlled through a single EMS computer.

2.5Service Interface Connection

The service interface connection between the HU and the EMS computer is supported by a single DB-9 female connector. The service connector provides an RS-232 DTE interface. When multiple HU’s are networked together, the supporting EMS computer may be connected to the service connector of any one of the networked HU’s.

2.6Powering

The HU is powered by ± 21 to ± 60 VDC power (nominal ± 24 or ± 48 VDC). The power is fed to the HU through a screw-down type terminal strip located on the rear side of the unit. Power to the HU must be supplied through a fuse panel such as the PowerWorx 20-position GMT fuse panel (available separately). The power circuit for each HU must be protected with a 3 Amp GMT fuse. An On/Off switch is provided on the HU front panel.

2.7User Interface

The HU user interface consists of the various connectors, switches, terminals, and LEDs that are provided on the HU front and rear panels. The HU user interface points are indicated in Figure 2 and described in Table 1.

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© 2004, ADC Telecommunications, Inc.