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Chapter 2: Virtual Chassis Stacking
The AT-XEM2-4QS Line Card also supports direct connect cables,
called AT-QSFPICU and AT-QSFP3CU cables. As with the AT-
XEM2-12XT Line Card, you can build stack trunks using AT-
XEM2-4QS Line Cards with either direct connect cables or fiber
optic transceivers, but not both. Figure 18 is an example of an
invalid trunk on AT-XEM2-4QS Line Cards because it uses both
direct connect and fiber optic cables.
Chassis 1
Wiring closet 1
AT-QSFPCU
direct connect
cable
Chassis 2
AT-QSFPSR4 or
AT-QSFPLR4
fiber optic
transceivers
and cables
Chassis 3
Wiring closet 2
Figure 18. Invalid Trunk Using Both Direct Connect and Fiber Optic
Cables on AT-XEM2-4QS Line Cards
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