RADWIN
2000
C
Plus
User
Manual
Release
3.5.70
11
‐
3
Cascaded
Sites
using
Shifted
Phase
Transmission
Chapter
11
Cascaded
Sites
using
Shifted
Phase
Transmission
The
solution
offered
here
is
not
a
“universal
cure”.
The
following
conditions
are
necessary,
but
in
any
specific
case
may
not
be
sufficient:
•
The
GSU
sites
(marked
1,
and
3
above)
are
sufficiently
far
apart
as
to
ensure
that
there
is
no
mutual
interference
between
communicating
sites
(1
‐
2
and
2
‐
3
above)
•
There
should
be
no
interference
between
non
‐
communicating
sites
(1
and
3
above).
To
see
how
it
works,
we
use
.
The
GSU
towers
are
numbered
and
marked
for
cascading,
1
‐
2
and
2
‐
3.
There
should
not
be
a
link
between
1
and
3.
The
GSU
can
synchronize
the
TDD
timing
of
several
sites
enabling
the
cascading
of
consecutive
links
without
mutual
interference.
To
use
cascading,
the
TDD
timing
of
the
even
‐
ordered
links
(GSU
2
above)
must
be
“shifted”
(Shifted
Phase)
and
odd
‐
ordered
links
(GSU
1
and
GSU
3
above)
must
be
“unshifted”
(Normal
Phase).
The
phase
shift
is
half
of
the
Radio
Frame
Duration
(RFD)
from
the
chosen
RFP.
The
scheme
is
shown
in
Since
the
GSU
is
always
HSS
master
(HSM),
at
each
GSU
location,
the
GSU
can
“force”
the
synchronization
of
its
collocated
radios.
By
half
RFD
shifting,
alternate
collocated
sites
can
talk
to
each
other.
Figure
11
‐
3:
Phase
shifted
transmission
‐
phase
shift
is
1/2
the
RFD
Choice
of
normal
or
shifted
phase
is
configurable
per
GSU
using
the
RADWIN
Manager.
GSU
Redundancy
The
GSU
is
designed
to
support
redundancy,
improving
the
robustness
of
a
GSU
based
topology.
In
redundancy
mode,
two
GSUs
are
installed
at
the
same
HSS
site.
One
of
them
self
‐
configures
to
generate
HSS
sync
signals.
We
will
call
it
the
Primary
unit.
The
other
one,
the
Secondary
unit
remains
dormant
merely
polling
the
first
GSU.
If
the
Primary
GSU
fails,
then
the
Secondary
GSU
becomes
active
immediately.
If
the
Primary
unit
becomes
active
again,
it
remains
dormant,
reversing
the
original
roles.
The
choice
of
the
Primary
GSU
is
random
and
of
no
significance.
Summary of Contents for 2000 C PLUS
Page 1: ...USER MANUAL RADWIN 2000 C PLUS POINT TO POINT BROADBAND WIRELESS Release 3 5 70...
Page 17: ...Part 1 Basic Installation Release 3 5 70...
Page 139: ...Part 2 Site Synchronization Release 3 5 70...
Page 166: ...Part 3 Advanced Installation Topics Release 3 5 70...
Page 167: ...RADWIN 2000 C Plus User Manual Release 3 5 70 12 1 Chapter 12 Reserved...
Page 188: ...RADWIN 2000 C Plus User Manual Release 3 5 70 17 1 Chapter 17 Reserved...
Page 189: ...Part 4 Field Installation Topics Release 3 5 70...
Page 219: ...Part 5 Product Reference Release 3 5 70...
Page 296: ......
