GE MDS Mercury 3650, Справочное руководство

Страница: 79 / 211

70 Mercury Reference Manual 05-4446A01, Rev. E
• Single Frequency Channel —The RF frequency that the inte-
grated radio will operate on when in single frequency
(non-hopping) mode. [
0 to 6 for 3.5-MHz, 0 to 13 for 1.75-MHz; 0 ].
• Frame Duration —Defines the over-the-air media access con-
trol framing. Note that this parameter is read-only when Fre-
quency Mode is set to Hopping w/Hand-offs . [ 5, 8, 10, or 20 msec;
20 msec ]
• Hop Pattern —Selects a pre-defined series of channels that is
followed when hopping. Note that this parameter is read-only
when
Frequency Mode is set to Hopping w/Hand-offs .
• Hop Pattern Offset —Inserts an offset into the hop pattern that
is synchronized with the GPS. For example, if the offset is 0,
the start of the pattern is aligned with the GPS timing. If the
offset is 3, then the fourth hop of the pattern is aligned with
the GPS timing. All of the APs that are part of a network
should use the same pattern and each one should have its own
offset.
In the diagram below, one Remote is configured for static
hopping and will only associate with AP1 because they are
both using Offset 0. The hand-off configured Remote, using
its AP Locations file, may connect to AP1, AP2, or AP3. The
Remote does this by determining the Offset for each AP, then
configuring its radio.
• Current AP (Remote only)—Shows the name of the AP that
the Remote is trying to associate with. Note that this param-
eter is read-only when
Frequency Mode is set to Hopping
w/Hand-offs
.
• TDD Sync Mode (AP only)—Indicates if the Access Point’s trans-
missions should synchronize with the GPS timing. Configure
this parameter to
GPS Required when the AP is configured for
Static Hopping
. TDD Sync Mode (Time-Division Duplex) is use-
ful in eliminating same-network interference for multiple-AP
installations. When enabled, all AP transmissions are synchro-
nized using GPS timing information. The result is that no AP
AP 1
Pattern A
Offset 0 AP 2
Pattern A
Offset 1 AP 3
Pattern A
Offset 2
RM
Static Hopping
Offset 0
RM
Hopping w/
Hand-offs