Appendix A: Multiple Chassis Local Connect
Multi-chassis Extension Unit
SmartBits 600x/6000x Installation Guide | 99
Multi-chassis Extension Unit Cable Connections
Important: The total accumulative length of the Category 5 UTP cable (RJ-45) used for
all connections between a layer of SmartBits chassis and another SmartBits chassis must
not exceed 50 feet in length (15.24 meters).
The primary SmartBits chassis connection that measures from the Primary Controller (or
#1 chassis) to the Principle Extension Unit (see Figure A-9) determines the maximum
cable length of subsequent cables used between a SmartBits chassis connected to the
Multi-chassis Extension Unit.
To determine the cable length limitation for these connections, subtract the length of the
Primary Controller/Principle Extension Unit cable from 50 feet (15.24 meters). In the
example shown in Figure A-9, the cable used to connect the master chassis to the Principle
Extension Unit is 3 feet in length. Therefore, the maximum accumulative cable length
from the extension unit to all directly connected chassis can be any variable under 47 feet
(50 - 3 = 47) in length (see Figure A-10 on page 100).
Multi-chassis Extension Unit Configurations
The Multi-chassis Extension Unit may be configured in various ways. For this connection
example, we will discuss using the OUT port of the Extension Unit exclusively.
Note: Refer to “Multi-chassis Extension Unit Terminology” on page 98 for terminology
descriptions.
Flat Connection
To set a flat connection:
1 Connect a cable from the expansion OUT port of the Primary Controller to the IN
port on the Principle Expansion Unit as shown in Figure A-9.
Figure A-9. Initial Connection of a SmartBits Chassis to an Extension Unit
Category 5 UTP Cable
Principle Extension Unit IN Port
Chassis OUT Port
Primary Controller
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