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User's Manual

ManualsBrandsADC Telecommunications ManualsElectronicsDigivance® LRCS 1900 MHz, 20-Watt LPA
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ADCP-75-158 • Issue 1 • July 2003 • Section 2: Description
Page 2-5
© 2003, ADC Telecommunications, Inc.
The host forward path attenuator adjusts the level of the input RF signal to the HU. Using the
forward path attenuator, an input signal with a nominal composite signal level of –9 dBm to –40
dBm can be adjusted to produce maximum power output. Additional external attenuation is
required if the input signal level is greater than –9 dBm.
The host reverse path attenuator adjusts the level of the output RF signal and will add from
–1 dB of gain (attenuator set to 31 dB) to +30 dB of gain (attenuator set to 0 dB) to the RF
output signal at the HU.
2.6 Propagation Delay
The HU forward and reverse path propagation delays may be adjusted in 0.1 µsec increments
within a range of 0 to 63 µs. The propagation delay is software controlled and may be adjusted
through the NOC/NEM interface or the EMS software GUI.
2.7 Optical Connection
Optical connections between the HU and the RU (STM) are supported through two SC-type
optical connector ports. 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.
2.8 Controller Area Network Interface Connection
Controller Area Network (CAN) interface connections between multiple HUs 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 HUs to be connected
together (in daisy-chain fashion) and controlled through a single Digivance EMS computer.
2.9 Service Interface Connection
The service interface connection between the HU and the Digivance EMS computer is
supported by a single DB-9 female connector. The service connector provides an RS-232 DTE
interface. When multiple HUs are networked together, the supporting EMS computer may be
connected to the service connector of any one of the networked HUs.
2.10 Powering
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 20 position PowerWorx Fuse Panel
(accessory item). 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.