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Chapter 2: Virtual Chassis Stacking
The XEM2-4QS Line Card also supports QSFPICU and QSFP3CU
direct connect cables. As with the XEM2-12XT Line Card, you can
build stack trunks using XEM2-4QS Line Cards with either direct
connect cables or fiber optic transceivers, but not both. Figure 25
is an example of an unsupported trunk on XEM2-4QS Line Cards
because it uses both direct connect and fiber optic cables.
Chassis 1
Wiring closet 1
QSFPCU direct
connect cable
Chassis 2
QSFPSR4 or
QSFPLR4 fiber
optic
transceivers
and cables
Chassis 3
Wiring closet 2
Figure 25. Unsupported Trunk with Both Direct Connect and Fiber Optic
Cables on XEM2-4QS Line Cards
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