PRELIMINARY
Ethernet Functions
4 Ethernet Functions
The packet radio is targeting multiple applications and network environments
with the embedded Ethernet capabilities. For information about the supported
Ethernet services, see Section 4.3 on page 13.
In addition to the Ethernet functions described in the following sections, the
following related functions are also available:
•
Synchronous Ethernet
, see
Section 5.2 on page
31.
• Ethernet Performance Counters
, see
Section 7.5.3 on page
43.
4.1
Ethernet in Microwave Networks
Compared to other transmission technologies, a microwave link can be
characterized as a limited bandwidth connection. This implies that microwave
equipment must be designed to enable maximum packet payload throughput
in the available bandwidth over the radio interface. The following features
improve the link efficiency:
Quality of Service
For connections with limited bandwidth it is important to prioritize high priority
packets when a connection is congested.
Adaptive Modulation
Adaptive modulation seeks continuously to use the modulation alternatives that
will maximize throughput under different conditions.
Low Residual BER
Microwave links operate with large fade margins and forward error correction
resulting in low residual BER level, typically 10
-12
.
Header Compression
The maximum bit rate of incoming traffic on the LAN interface can be
significantly higher than the maximum bit rate over the radio link. To maximize
the throughput on the radio link, parts of the Ethernet frame is removed and the
remaining headers are compressed before it is sent over the radio link.
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1/22102-HRA 901 17/9 Uen PU1 | 2016-07-04
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