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For UMTS data traffic, the in-order sequence delivery between the Radio Base
Station/nodeB and the Radio Network Controller (RNC) can cause bursts of
hundreds of milliseconds.
LAN port buffers are designed to be very small in order to keep delay variation
as small as possible, whereas WAN port buffers are larger, to enable handling
of congestion at the WAN port. This can be achieved by ensuring that the
WAN port link speed is lower than the LAN port link speed (including overhead
and so on).
4.2
Native Ethernet
This section describes Native Ethernet in MIN-LINK PT 2010.
The Ethernet traffic is sent over a single hop or through a network. Native
Ethernet traffic is sent over a dedicated physical link instead of being transported
over PDH or SDH. Native Ethernet enables more efficient use of bandwidth and
maximizes Ethernet throughput since no PDH overhead is added.
Overhead Comparison
The overhead for Native Ethernet is only 0.5% for 1,000 byte frames, in
comparison to 6.0% for Ethernet over PDH.
Table 2
Interface types
Frame size
Throughput
1/221 02-CSH 109 172/1-V1 Uen E | 2012-11-07
Native Ethernet WAN Port Properties
Native Ethernet WAN port
properties
Ethernet Traffic Handling in MINI-LINK PT 2010
Description
Packet Link radio interface
An Ethernet over Packet Link WAN
port supports frames with a size up to
9,216 byte (Jumbo Frames)
The Packet Terminal supports
Ethernet transport over the radio hop.
The following maximum bit rate over
the radio hop is supported by the
Packet Terminal:
406 Mbps in a 56 MHz channel
The effective Ethernet payload
throughput is less than the maximum
bit rate due to a framing overhead.
For 2,048 byte frames, 99.5% of the
bit rate capacity is used for Ethernet
payload (link efficiency).
7
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