74
Mercury Reference Manual
05-4446A01, Rev. E
•
Max Modulation
—Sets the highest modulation speed the trans-
ceiver will use.
[
BPSK, QPSK-1/2, QPSK-3/4, 16QAM-1/2, 16QAM-3/4, 64QAM-2/3;
QAM16-3/4
]
•
Cyclic Prefix
(AP only)—Amount of additional information
added to the over-the-air packets to mitigate the effects of chan-
nel multipath. [
1/4, 1/8, 1/16,1/32; 1/16
]
•
Channel Type
(AP only)—This parameter, available on Access
Point units, must be set appropriately according to the signal
conditions of a network. For installations with strong signals,
low interference, and minimal fading, set the Channel Type
parameter to
Static
. This setting is generally appropriate for
Access Points whose Remotes are in fixed locations. It supports
a large offered payload with high packet rates.
For installations with significant interference and fading or
nomadic/mobile Remotes, set the Channel Type parameter to
Dynamic
. [
Static, Dynamic; Static
]
•
ARQ
(AP only)—Enables the Automatic Repeat Request func-
tion.
[
enable, disable; enabled
]
•
ARQ Window Size
(AP only)—The maximum number of blocks to
send before receiving an acknowledgement. [
1—1024; 512
]
•
ARQ Block Size
(AP only)—ARQ is applied to payload data in
blocks of this size. [
4—2040; 256
]
•
ARQ Block Lifetime
(AP only)—ARQ blocks are valid for this
length of time. [
0—655; 655
]
•
ARQ Transmitter Delay
(AP only)—The length of time the trans-
mitter waits before repeating an unacknowledged packet.
[
1—655; 35
]
•
ARQ Receiver Delay
(AP only)—The length of time the receiver
waits before repeating an unacknowledged packet. [
1—655; 35
]
•
Downlink Percentage
(AP only)—The percentage of link time
given to downstream traffic. It should be set to
50%
when
Adap-
tive Split
is set to
enabled
. [
10-90%; 50%
]
•
Adaptive Split
(AP only)—The adaptive split feature provides
improved link utilitization and throughput for burst payload
traffic. The Mercury is a TDD system and normally allocates
50% of its capacity to the downlink and 50% to the uplink.
When adaptive split is enabled, the Media Access Controller
(MAC) in the Access Point monitors the traffic flow continu-
ously in the downlink and uplink directions. The MAC automat-
ically modifies the downlink split in response to the traffic load.
When more traffic is flowing upstream, the downlink split
changes to allocate additional capacity to the uplink. When
more traffic is flowing downstream, the downlink gets addi-
tional capacity. If TDD synchronization is used to synchronize
Access Points and minimize inter-Access Point interference,
Adaptive Split should be disabled. [
enabled, disabled; enabled
]
Summary of Contents for Mercury 3650
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