Operation Manual

Introduction
2
Definitions
The following abbreviations, industry standard lingo and acronyms are used in this document.
BGW Base station Gateway, see
"Base Station Gateway (BGW)" on page 4
BIU
Base station interface. Also known as the DIU. It is the electrical interface between the Master
Frame Unit (MFU) and the operator radio base station or another source for the radio signals,
such as a off-air repeater. See "Base Station Interface Unit (BIU)" on page 8
BTS See RBS.
DAS
A distributed antenna system. Several antennas connected together in a c
oaxial network so that
several antennas can be fed a signal from a central location.
DL See “Downlink”
Downlink The signals that are transmitted from a base station towards a t
erminal (phone).
Fiber
In this document it refers to the telecommunication fibers used to transmit modulated light as
pulses or analog variations on a glass fiber. The Bird Fiber-DAS system should use single-mode
fiber always.
Fiber-DAS
A general name for distribution systems using radio frequency on fiber (RF on Fiber) technology.
DAS means “Distributed Antenna System” which refers to the practice of building “spreading
nets” with coaxial cables, splitters and antennas to cover larger structures.
FOI Fiber-optic interface. See "Fiber Optic Interface (FOI) unit" on page 15
FOR Fiber-optic remote interface, part of the Remote Unit connecting to the fiber.
GSM Global System for Mobile Communications
ICU Interconnect Unit, RF splitter/combiner unit, see "Interconnect Unit (ICU)" on page 13
iDEN Integrated Digital Enhanced Network
LTE Long Term Evolution
MFU
Master Frame Unit. The MFU contains the modules that make up the head end of the system.
The MFU is the radio base stations interface with the Fiber-DAS system. The MFU is where the
downlink signals from the base stations are converted into laser light and sent over the fiber-
optics to the Remote Unit (RU) and the uplink signals from the RU are converted to radio
frequency signals and transmitted to the radio base station (RBS, BTS).
PIM
Passive Intermodulation (PIM) is the generation of interfering signals caused by nonlinearities in
the mechanical components of a wireless system. Two signals mix together (amplitude
modulation) to produce sum and difference signals and products within the same band, causing
interference.
QMA Quick connect/disconnect type of RF Connector. Replacement for SMA RF Connectors. See SMA
RBS
Radio Base Station. The infrastructure unit normally connected to the antennas in the radio
access network (RAN) and sometimes called just Base Station or Base Transceiver Station (BTS).
RGW Remote Gateway Unit, see "Remote Gateway (RGW)" on page 6
RU
Remote Unit. This is the unit closest to the antenna that converts the downlink signal from the
fiber to radio frequencies and distributes it over the antenna system. In the reverse, the uplink
radio frequencies are converted to modulated laser light and transmitted back to the MFU.
SC-APC
The type of connector used for all Bird optical equipment. It is recommended that all connectors
between the MFU and the RU are of this type. SC-AP can also be accepted in patch panels. All
connectors MUST BE ANGLED to avoid signal reflections that are detrimental to the signal
quality. Fibers need to be of single-mode type.