Section 8.1.8, Section 8.1.9 – Westermo RedFox Series User Manual
Page 174
Westermo OS Management Guide
Version 4.17.0-0
Note
Outbound traffic shaping in frames per second mode is available for Ethernet
ports on all WeOS products, with exceptions for ports on some RedFox and
RedFox Industrial Rack models. The Ethernet ports listed to have restrictions
for ingress rate limiting (see
) also lack support for the frames
per second mode.
Furthermore, outbound traffic shaping in frames per second mode is not
available available for DSL ports (ADSL/VDSL or SHDSL) ports.
8.1.8
MDI/MDIX crossover
By default a switch is able to sense which pin to use for reception and which
to use for transmission (auto MDI/MDIX crossover), thus no external crossover
cable is necessary. In addition, a port can be configured statically in MDI (Media
Dependent Interface) or MDIX (crossover) mode.
8.1.9
Fastlink - Fast link-up/link-down on fixed 10/100 Ethernet
copper ports
Default port settings in WeOS are aimed at being conformant and compatible with
as many devices as possible. Therefore the ports are setup to auto-negotiate
speed, duplex and automatically agree with the link partner on which end should
cross RX and TX when a straight cable is used. Naturally this takes a bit of time,
despite all current products today do this in dedicated PHY circuitry.
To speed things up considerably, a feature called ”Fastlink” can be activated on
fixed 10/100 Mbit/s Ethernet copper ports
. This feature basically disables any
IEEE back-offs and timeouts in place to protect against glitches and temporary
link loss that otherwise prevent the port from going UP or DOWN. Westermo has
put a great deal of effort into making sure that, when enabling Fastlink, glitches
and link loss still do not occur.
Enable Fastlink by configuring the port(s) with the following two settings:
❼ Fixed speed/duplex mode, preferably 100 Mbit full-duplex. That is, auto-
negotiation of speed/duplex mode is disabled. See
for infor-
mation on port speed/duplex.
2
Fastlink does not apply to Gigabit Ethernet ports, or to any SFP ports.
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