Nokia MetroHopper User Manual page 128

degraded Minute containing an error ratio exceeding 1 x 10
minute; DM
duplex spacing Difference between transmitting and receiving frequencies.
errored block;
Block of bits containing one or more bit errors.
EB
errored second;
Second containing one or more digital transmission errors, excluding any
ES unavailable time.
FC RRI
Radio indoor unit for Nokia MetroHopper and Nokia FlexiHopper.
FC RRI supports one outdoor unit through a Flexbus connection and provides one
2 Mbit/s connection to the BTS. FC RRI is integrated into Nokia MetroSite BTS.
FIU 19 Radio indoor unit for Nokia MetroHopper and Nokia FlexiHopper.
Depending on configuration, FIU 19 supports up to four outdoor units through
Flexbus connections. FIU 19 can be installed in any standard 19-inch rack or TM4
slim rack
Flexbus Bidirectional coaxial cable that carries up to 16 x 2 Mbit/s signals and power
between transmission units, for example, between radio outdoor unit and indoor
unit.
forward error
Technique allowing the receiver to correct errors occurring on a transmission
correction; FEC
channel without requiring retransmission of the data.
front-to-back For a directional antenna, ratio of field strength in front of the antenna to field
strength behind the antenna (180 degrees ±40 degrees). The ratio is measured at
ratio; F/B ratio
a fixed distance from the radiator and expressed in dB.
functional entity;
Part of a network element, for example, MetroHopper outdoor unit or 4 x 2M
FE
plug-in unit.
The functional entities are numbered so that the network element is always FE 0
and numbers 1through254 are reserved for the actual FEs. A functional entity can
contain several supervision blocks (SB).
FXC RRI
Radio indoor unit for Nokia MetroHopper and Nokia FlexiHopper, which has
cross-connection capability at 8 kbit/s level.
FXC RRI supports two outdoor units through Flexbus connections. FXC RRI can
be installed in Nokia MetroHub or Nokia MetroSite BTS.
gain
Amplification. Gain of an antenna is expressed dBi, decibels over a theoretic,
isotropic, uniformingly radiating antenna.
indoor unit
Part of the microwave radio which is installed indoors and usually contains the
baseband parts.
DN99593058 © Nokia Networks Oy
Issue 2-1 en
−6
but not exceeding 1 x 10
Terms
−3
.
7 (10)