TV
White
Space
Installation
Guide
Release
1.0
C
‐
2
Diversity
A
technique
by
which
the
reliability
of
a
radio
link
is
increased
using
multiple
transmitting
and
receiving
antennas,
transmitting
the
same
signal
on
all
antennas.
Downlink
Data
traffic
from
an
HBS
to
an
HSU,
or
Data
traffic
from
an
RT
‐
A
to
an
RT
‐
B
DUO
Dual
Band
base
station
EIRP
Equivalent
(or
Effective)
Isotropically
Radiated
Power:
The
power
that
an
antenna
must
emit
to
produce
the
peak
power
density
in
the
direction
of
maximum
antenna
gain.
In
our
cases,
this
is
usually:
System
Tx
Power
+
Antenna
Gain
‐
Cable
Loss.
FAA
Federal
Aviation
Administration.
A
U.S.
federal
office
that
manages
aviation
regulations
throughout
the
United
States.
Fixed
(HSU)
A
“fixed”
HSU
remains
in
one
location,
as
contrasted
with
a
nomadic
or
mobile
HSU,
which
does
not
remain
in
one
location.
GHSS
GPS
Hub
Site
Synchronization
GRE
Generic
Routing
Encapsulation.
A
communication
protocol
used
to
establish
a
direct,
point
‐
to
‐
point
connection
between
network
nodes.
GRE
lets
two
peers
share
data
they
wouldn’t
be
able
to
share
over
the
public
network
itself.
GRE
Tunnel
A
virtual
point
‐
to
‐
point
connection
between
two
networks,
using
the
GRE
protocol
to
carry
this
out.
HBS
High
capacity
Base
Station.
Same
as
a
BS
HMU
High
capacity
Mobility
(subscriber)
Unit.
Similar
to
an
HSU,
but
can
be
mobile.
HSC
Hub
Sync
Client:
When
using
Hub
Site
Synchronization,
one
unit
is
a
master
(generates
the
sync
pulses),
and
the
other
units
are
clients.
HSM
Hub
Sync
Master:
When
using
Hub
Site
Synchronization,
one
unit
is
a
master
(generates
the
sync
pulses),
and
the
other
units
are
clients.
HSU
High
capacity
Subscriber
Unit.
Same
as
an
SU
IGMP
Internet
Group
Management
Protocol
ISU
Integrated
Synchronization
Unit:
a
network
device
that
provides
a
synchronization
signal
to
underground
HBSs.
ITHO
Intra
‐
train
handover
mechanism
LFF
Large
Form
‐
Factor
Table
C
‐
1:
Terminology
(Sheet
2
of
4)
Term
Description
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