Zhone 891630, Справочное руководство системы

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Reference Guide IMACS System Release 5.1.9 7-43
WAN Card PARS Screen
A four node configuration operating in PARS mode is illustrated in Figure 7-28. In this
configuration one user port per node is used for the purpose of illustration. In node one the
transmit of all 24 time slots of W1-1 are cross-connected to the receive of all 24 time slots of
W1-2. The receive of 23 time slots of W1-1 are cross-connected to the transmit of 23 time slots
of W1-2. The HSU transmit is connected to the receive of one of the W1-1 time slot and its
receive is connected to the transmit of the corresponding time slot of W1-2. Similar
connections are made in the rest of the nodes.
Figure 7-28. PARS Normal Operation Mode using four IAD Nodes
7.5.8 Line Protection - Link Failure
When WAN links fail, the ring will break. The integrated access device will stop delivering
traffic to the broken links and will reroute the traffic through the ring and loop them before the
broken lines.
Node 1
Node 3
Node 4
Node 2
HSU
W1-1
W1-2
HSU
W1-1
W1-2
HSU
W1-1
W1-2
HSU
W1-1
W1-2
Cross-Connect
Cross-Connect
Cross-Connect
Cross-Connect