100
DataMover ESS User’s Guide
SIMREX MAN.ESS-01, Rev. F
SIMREX Corporation
Data Latency—TCP versus UDP Mode
The latency of data passing through a network will depend on user data
message length, the overall level of traffic on the network, and the
quality of the radio path.
Under ideal conditions—low traffic and good RF signal path—the
latency for units operating in the TCP mode, will typically be around 5
ms in each direction. However, when UDP multicast traffic is trans-
ported, the outbound packet latency (from AP to remote) is dependent
on the beacon period.
UDP multicast packet latency can be minimized by setting the
Beacon
Period
to
Fast
(52 ms). Changing beacon rate to
Fast
will result in an
average latency of 31 ms, assuming outbound packets wait for a beacon
transmission 50% of the time (26ms) plus the normal packet latency
(5 ms).
Data Compression
Enabling this option uses an LZO compression algorithm for
over-the-air data. Varying levels of data reduction are achieved
depending on the nature of the data. Text files are typically the most
compressible, whereas binary files are the least compressible. On
average, a 30% increase in throughput can be achieved with compres-
sion enabled.
Compression is used on data packets of 100 bytes or more, including
Ethernet, IP, and TCP/UDP headers.
Packets-per-Second (PPS)
The ESS radio has a limit of 70 PPS. Consider this restriction when
planning your network, especially when smaller packets are expected to
make up the majority of the traffic as is the case with VoIP (Voice over
IP).
3.9
MAINTENANCE
In the normal course of operating a wireless network, you will want to
take advantage of product improvements, and to read and archive the
configuration of your individual transceivers using the
Maintenance
Menu
. This section provides detail information on how to take advan-
tage of these services.
The maintenance tasks are:
•
Reprogramming
— Managing and selecting the unit’s operating
system firmware resources.
(
See “Reprogramming Menu”
on
Page 101
)
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