Ask Bjørn Hansen wrote:
The "A" in ADSL has minimal or no impact.
The static offset caused by the "A" in ADSL is very small, and it is
quite likely that upstream packets, that experience more delay on the
final hop, are delayed less than downstream packets further in the
carrier and/or ISP network (because that is loaded more in the
downstream direction).
However, the "A" in link usage has quite some influence. When you are
up- or downloading large files and saturate the link, the delay in one
direction will really jump up. Normal delay of an ADSL link is only a
few ms in each direction (e.g. 7ms roundtrip for a standard ping
packet), but this will easily increase to 50-100 ms in one direction
when a TCP connection is pushing data.
To avoid this, traffic shaping can be used. This especially helps for
avoiding saturation of the uplink.
Rob
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