Westermo RedFox Series Management Manual page 1085

ˆ Single ECN with redundant ETBNs: This topology is shown in
topology provides redundancy in the communication between ETB and ECN.
One of the ETBNs (ETBN1 and ETBN2) will be the active (master) router,
while the other is in backup state, being ready to take over if the "master"
fails. In WeOS products, VRRP is used to manage the router redundancy (see
section 43.1.3.5). All ETBNs in the consist will be configured with the same
UUID (here "2323").
ˆ Multiple ECNs with one ETBN: This topology is shown in
possible to have more than one consist network attached to a single ETBN.
ˆ Multiple ECNs with redundant ETBNs: This topology is shown in
and aims to illustrate that it is possible to have more than one consist net-
work per ETBN and still achieve redundancy. All ETBNs in the consist will be
configured with the same UUID (here "4545").
ˆ Multiple ECNs with separate ETBNs: This topology is shown in
is possible to have more than one network of the types shown in (a)-(d) in
the same consist. All ETBNs in the consist will be configured with the same
UUID (here "5656").
Below some additional aspects of TTDP is listed, which should be considered
when designing and configuring your consists:
ˆ Consist UUID: For each consist, you need to allocate a consist UUID. IEC
61375-2-5[14] refers to RFC4122[25] for the method to allocate UUID for
your consist. When you have allocated a UUID for a consist, you need to
configure that UUID into every ETBN in that consist (see
ˆ Consist Reference Direction: When designing your consist you need to de-
fine the consist reference direction (section 5.4.4.6.1 of [13]) for the consist.
– The consist reference direction is decided by the system builder. It is
not explicitly part of the TTDP configuration, but it is implicitly config-
ured via the ETBN dir1 and dir2 settings. Thus, a management system
can implicitly learn the orientation of a consist by reading out the direc-
tion of any ETBN located in that consist and compare that with the ETB
reference direction calculated by TTDP.
– All ETBNs in the consist must set their dir1 setting as the aggregate
pointing in the consist's decided reference direction (see section 8.2.3
of IEC 61375-2-5 standard[14]). In
ery ETBN points in the consist reference direction decided by the train
builder. Note in particular that when there are multiple ETBNs per con-
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Westermo OS Management Guide
fig. 43.3 you can see that Dir1 of ev-
Version 4.24.1-0
fig. 43.3b). This
fig. 43.3c). It is
fig. 43.3d)
fig. 43.3e). It
section 43.1.3.4).
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