Allied Telesis AT-SBx81CFC960 - Manual (Page 271)

SwitchBlade x8106 Chassis Switch and AT-SBx81CFC960 Card Installation Guide
Section III: Building a Stack with VCStack Plus 271
Stack Trunk and Stacking Transceivers
The two chassis of the stack are connected with the stack trunk. The trunk
consists of the following components:
 The four SFP+ slots on the front panel of the AT-SBx81CFC960
Controller Fabric Card.
 AT-Stack stacking transceivers from Allied Telesis and fiber optic
cables.
The trunk of the stack can have either four or eight links. The number of
links depends on the number of AT-SBx81CFC960 Controller Fabric
Cards in the switches. Given that the controller card has four SFP+ slots,
the trunk can have four links if both switches have only one controller card
and eight links if both switches have two controller cards.
The stack uses all the links in the trunk to actively forward traffic between
the switches. The bandwidth of the trunk is 40Gbps with four links and
80Gbps with eight links.
There are two stacking transceivers. They are the AT-StackOP/0.3 and
AT-StackOP/9.0 transceivers. Both transceivers use fiber optic cables.
The difference between them is their maximum operating distances. One
transceiver has a maximum operating distance of 300 meters and the
other has a distance of 9 kilometers. The correct transceiver for your
installation will depend on the distance between the two chassis of the
stack. The transceivers are listed in Table 23.
Here are the transceiver guidelines:
 The stacking transceivers can only be used in the SFP+ slots on
the AT-SBx81CFC960 Controller Fabric Card and only with the
Table 23. Stacking Transceivers
Stacking
Transceiver Model
Cable Type Operating Distance
AT-StackOP/0.3 62.5/125 µm multi-
mode fiber optic
cable 33 meters (108 feet)
50/125 µm multi-
mode fiber optic
cable 300 meters (984 feet)
AT-StackOP/9.0 9/125 µm single-
mode fiber optic
cable 9 kilometers