Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 247 of 669
Port 0 APS MEP
This is the Port 0 APS PDU handling MEP. Assign an integer value of
1
-
x
. The Port 0 APS MEP and
Port 1 APS MEP cannot be the same. Note that the number refers to the MEP instance number and
not the MEP ID (which may or may not be the same).
Port 1 APS MEP
The Port 1 APS PDU handling MEP. As only one APS MEP is associated with interconnected sub-
ring without virtual channel, it is configured as "
0
" for such ring instances. "
0
" in this field indicates
that no Port 1 APS MEP is associated with this instance. Assign an integer value of
1
-
32
. The Port 0
APS MEP and Port 1 APS MEP cannot be the same. Note that the number refers to the MEP
instance number and not the MEP ID (which may or may not be the same).
Port 0 SF MEP
This is the Port 0 Signal Fail reporting MEP. Assign an integer value of
1
-
32
. Port 0 SF MEP and
Port 1 SF MEP cannot be the same. Note that the number refers to the MEP instance number and
not the MEP ID (which may or may not be the same).
Port 1 SF MEP
This is the Port 1 Signal Fail reporting MEP. As only one SF MEP is associated with interconnected
sub-ring without virtual channel, it is configured as "0" for such ring instances. A "
0
" in this field
indicates that no Port 1 SF MEP is associated with this instance. Assign an integer value of
1
-
32
.
Port 0 SF MEP and Port 1 SF MEP cannot be the same. Note that the number refers to the MEP
instance number and not the MEP ID (which may or may not be the same).
Ring Type
Select the type of Protection ring. It can be either
Major
ring or
Sub
-ring.
Major
ring: the Ethernet ring that is connected on two ports to an interconnection node.
Sub
-ring: an Ethernet ring which is connected to one or more other Ethernet rings or networks
through the use of a pair of interconnection nodes. On their own, the sub-ring links do not form a
closed loop. A closed connection of traffic may be formed by the sub-ring links and one or more links
that are controlled by other Ethernet ring or network, between interconnection nodes.
Interconnected Node
Interconnected Node indicates that the ring instance is interconnected. Click on the checkbox to
configure this.
"
Yes
" indicates it is an interconnected node for this instance.
"
No
" indicates that the configured instance is not interconnected.
Virtual Channel
Sub-rings can either have virtual channel or not on the interconnected node. This is configured using
this "Virtual Channel" checkbox.
"
Yes
" indicates it is a sub-ring with virtual channel.
"
No
" indicates, sub-ring doesn't have virtual channel.
(Sub-ring with or without R-APS virtual channel.)
Sub-ring with R-APS virtual channel
: In this option, a virtual channel to tunnel R-APS messages
from one interconnection node to the other interconnection node is established.
Sub-ring without R-APS virtual channel
: In this option, the R-APS channel is terminated at the
interconnection nodes and its R-APS messages are not tunneled between the interconnection nodes.
The Ring Interconnection options are shown in Rec. ITU-T G.8032/Y.1344 (03/2010).
R-APS messages are transmitted with the request/state and status information defined by the R-APS
request process. The R-APS messages are transported via an R-APS specific VLAN. If the R-APS
information to be transmitted has been changed, a burst of three R-APS messages is transmitted as
quickly as possible, to ensure the fastest protection switching possible. For messages other than an
‘event’ message, the R-APS message continues to be transmitted, after the first three messages are
