IBM System/34 Maintenance Manual page 466

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2400 BPS I ntegrated Modem
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Operator Panel
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External Cable To CBS Coupler
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Signal Ground
Data Modem Ready
Coupler Cut Through
Off Hook
Ring Indicator
Data Tip
Data Ring
Figure 31-5. 2400 BPS Integrated Modem-Switched Network (Line 2)
31-120
Data Communications 7
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