| Schedule of Disaggregation of Revenues |
For Transition Networks, we analyze revenue by region and product group, which is as follows for the three months ended March 31, 2019 and 2018:
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Transition Networks Sales by Region
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Three Months Ended March 31
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2019
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2018
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North America
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$
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6,910,000
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$
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7,641,000
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Rest of World
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725,000
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975,000
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Europe, Middle East, Africa ("EMEA")
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1,255,000
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537,000
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$
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8,890,000
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$
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9,153,000
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Transition Networks Sales by Product Group
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Three Months Ended March 31
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2019
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2018
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Media converters
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$
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5,378,000
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$
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5,184,000
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Ethernet switches and adapters
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2,000,000
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2,260,000
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Other products
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1,512,000
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1,709,000
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$
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8,890,000
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$
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9,153,000
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For Suttle, we analyze revenues by product and customer group, which is as follows for the three months ended March 31, 2019 and 2018:
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Suttle Sales by Product Group
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Three Months Ended March 31
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2019
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2018
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Structured cabling and connecting system products
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$
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5,077,000
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$
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6,573,000
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DSL and other products
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444,000
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400,000
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$
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5,521,000
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$
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6,973,000
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Suttle Sales by Customer Group
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Three Months Ended March 31
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2019
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2018
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Communication service providers
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$
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4,591,000
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$
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5,947,000
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International
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400,000
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580,000
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Distributors
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530,000
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446,000
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$
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5,521,000
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$
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6,973,000
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For JDL, we analyze revenue by customer group, which is as follows for the three months ended March 31, 2019 and 2018:
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JDL Revenue by Customer Group
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Three Months Ended March 31
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2019
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2018
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Education
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$
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1,473,000
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$
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109,000
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Healthcare and commercial clients
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735,000
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601,000
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$
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2,208,000
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$
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710,000
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