Specifications

Reference Guide 6-53
WAN Card PARS Screen
A four node configuration operating in PARS mode is illustrated in Figure 6-43. 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.
6.4.8 Line Protection - Link Failure
When 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.
Figure 6-44. PARS Normal Operation Mode (two nodes)
Figure 6-44 shows details of PARS mode for two nodes. Primary WANs are cross-connected
to secondary. User cards appear to be terminated normally on the primary WAN. They are
actually split between RX of the primary and TX of the secondary, as shown. Note that the
physical connections between nodes are shown from the secondary WAN of one node to the
primary WAN of the adjacent node.
RX
W1-1
TX
TX
W1-2
RX
RX
W2-1
TX
TX
W2-2
RX
HSU, FXS, E&M or SRU Ports
123
HSU, FXS, E&M or SRU Ports
123
TS1TS1