Nokia MetroHopper User Manual page 127

Tx Transmitter
U
Unit of height, 44.45 mm
Terms
19-inch rack
Rack which is 19 inches wide and conforms to the IEC 297 specification.
adjacent channel Interference caused by a transmitter operating on an adjacent radio channel.
interference; ACI
ACI tolerance is expressed in dB as a carrier to interference ratio.
AGC tracking
Ability of the AGC (Automatic Gain Control) circuit to follow fast changes in the
level of the received signal.
alignment unit
Set of mounting brackets of the antenna which is used to attach the antenna to the
mast and to align it towards the opposite station.
An outdoor unit can also be attached to the alignment unit.
bit error ratio;
Ratio of the number of bit errors to the total number of bits transmitted in a given
BER time interval.
branching
Station which distributes one or more transmission channels to other transmission
station paths.
burst
Synchronisation of the TDD bursts of several radios. The synchronisation is
synchronisation achieved by connecting several master radios with the synchronisation bus and
selecting one of them to act as the synchronising master unit.
chaining station Station which transmits into two directions as a part of a transmission chain.
Data can be added/dropped to the signals going in either direction. A chaining
station where no add/drop occurs is called a repeater station.
co-channel
Interference between two signals of the same type on the same radio channel.
interference; CCI
CCI tolerance is expressed in dB as a carrier to interference ratio.
commissioning
Process of bringing software or hardware into use for the first time.
cross-
Connection between input port(s) and output port(s) in a network element.
connection; CC
There are different types of cross-connections.
cross-
Information base which defines the cross-connections of a network element.
connection bank
NE contains two or more banks, one of which is always active.
6 (10) © Nokia Networks Oy
Glossary
DN99593058
Issue 2-1 en