Datasheet

AD8158
Rev. B | Page 27 of 36
APPLICATIONS INFORMATION
The main application of the AD8158 is to support redundancy
on both the backplane side and the line interface side of a
serial link. Each port consists of four lanes to support standards
such as XAUI. Figure 43 illustrates redundancy in an XAUI
backplane system. Each line card is connected to two switch
fabrics (primary and redundant). The device can be configured
to support either 1 + 1 or 1:1 redundancy. Also, the AD8158 can
enable module redundancy, as shown in Figure 44, and can be
used as a four-, eight- or 12-lane signal conditioning device to
enable high speed serial communication over long copper links.
FABRIC CARDS
LINE CARDS
BACKPLANE
AD8158
PHYSICAL
INTERFACE
MACs
FRAMERS
FABRIC INTERFACE
TRAFFIC MANAGERS
NETWORK PROCESSOR
FABRIC INTERFACE
TRAFFIC MANAGERS
NETWORK PROCESSOR
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REDUNDANT
SWITCH
FABRIC
PRIMARY
SWITCH
FABRIC
PHYSICAL
INTERFACE
MACs
FRAMERS
Figure 43. Using the AD8158 for Switch Redundancy
LINE CARD
MACs
FRAMERS
FABRIC INTERFACE
TRAFFIC MANAGERS
NETWORK PROCESSOR
PRIMARY
MODULE
REDUNDANT
MODULE
AD8158
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Figure 44. Using the AD8158 for Module Redundancy
EQ PE
EQ
ASIC 1
ASIC 2
PE
PE EQ
PE EQ
OUT 1
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
Z
0
LOSSY CHANNELLOSSY CHANNEL
OUT 4
IN 5
IN 8
IN 1
IN 4
OUT 5
OUT 8
06646-147
Figure 45. Using the AD8158 for Signal Conditioning