Appendix A: Multiple Chassis Local Connect
Multiple Chassis Connections
86 | SmartBits 600x/6000x Installation Guide
Multiple Chassis Connections
If you are connecting multiple SmartBits chassis locally with CAT-5 UTP cables for use
with any SmartBits application, you MUST synchronize all chassis with the procedure
presented in this document.
Many SmartBits applications are designed to perform tests with hundreds of SmartBits
ports by connecting multiple chassis together as defined in this document. Multiple
chassis environments may include any mixed combination of SmartBits 10, SmartBits
200/2000, or SmartBits 600x/6000x chassis. This document references all of these chassis
types.
Important: The following rules must be followed to ensure proper multiple chassis
connections, synchronization, and correct test results. Failure to comply with these
procedures will result in faulty tests results such as frame loss and out of order frames:
• When using a multiple chassis configuration that contains SmartBits 600x/6000x
chassis, you must use a synchronous CAT-5 straight-through (not crossover) cable to
connect the chassis together. (Refer to “Cable Information” on page 86.) The use of
the synchronous cable is required in order for overall test results to be accurate (not
just the latency test results, but all test results). Maximum distance between chassis is
3 feet (.9144m).
• All of the chassis in the arrangement must be booted in the proper order. (Refer to
“Power Up the Multiple Chassis In Sequential Order” on page 94.)
• The synchronized clock and pulse signals passing through the connected chassis
require careful sequential powering up. Failure to do so will cause random errors and
incorrect test results. (Refer to “Power Up the Multiple Chassis In Sequential Order”
on page 94.)
Failure to comply with these connection and synchronization procedures will result in
faulty tests results, including frame loss and out-of-order frames.
Cable Information
Spirent Communications provides the following cable kit (Spirent part number
620-5000-003) which is described in “Checking the SmartBits Package” on page 30.
In addition, when using a SmartBits 2000 chassis, you will receive the following:
• One Cable Assembly Terminator (Spirent part number 620-0032-001)
• One CPU-Card Cage Cable Assembly (Spirent part number 620-0017-001)
• One Expansion Cable (Spirent part number 620-0019-001) for each chassis used, if
you are using multi-chassis stacking.
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