MD8000
Rev. H
MD8000 Series Transport System Summary
2.23
Hitless Switching With Dual SWCNT Boards
Figure 2-20 illustrates the dual SWCNT board operation. The originating Channel Service
board (VTX) transfers the identical IP frames with mutually different destination addresses to
both SWCNT boards through separate routes. The L2SW of each SWCNT board transfers the
IP frames to a separate Trunk board to enable the use of physically separate network circuits.
Figure 2-20: Hitless Switching - Dual SWCNT Board Operation
Figure 2-21 illustrates a little further in detail the behavior of the Channel Service boards.
Under the dual SWCNT board configuration, as shown in Figure 2-21, two identical Stream-
packet streams (except their destination address) can be routed through the completely
independent circuits between the peer Channel Service boards.
Figure 2-21: Operation Of Channel Service Board
Network
VTX
Encoder
LINE1 TX
LINE2 TX
Trunk
board
MD8000
L1 P#6
MD8000
L1 P#1
L1 P#2
L1 P#3
L2 P#1
L2 P#2
VRX
FIFO
#1
FIFO
#2
Decoder
SWCNT
Trunk
board
SWCNT
L1 P#7
L2 P#7
L2 P#6
LINE1 TX
LINE2 TX
L1 P#5
L1 P#4
L2 P#5
L2 P#3
L2 P#4
Trunk
board
SWCNT
Trunk
board
SWCNT
Summary of Contents for MD8000 Series
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