Network Testing/Debugging Hardware:
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SMSC (Product Rep)
EVB PC20022 - Evaluation Board for COM20022 ARCNET Network Controller (ISA Card)
EVB PC20020 - Evaluation Board for COM20020 ARCNET Network Controller (ISA Card)
EVB PC20019 - Evaluation Board for COM20019 ARCNET Network Controller (ISA Card)
EVB 20051 - Evaluation Board for COM20051 ARCNET Network Controller + 8051
ControLink 51 - Data Link Layer (IEEE 802.2) Software - Source Code
ControLink 86 - Data Link Layer (IEEE 802.2) Software - Source Code

Network Monitors:
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Contemporary Control Systems
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ph: 630-963-7070  fx: 630-963-0109
Web: http://www.ccontrol.com
ARC DETECT - portable, hand held monitor

TRITICOM
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ph: 612-937-0772  fx: 612-937-1998
Web: http://www.triticom.com
Several different products

KLOS Technologies
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ph: 607-753-0568  fx: 607-753-6621
Web: http://www.klos.com
Several different products 

Cimetrics
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ph: 617-350-7550  fx: 617-350-7552
Web: http://www.cimetrics.com
Several different products