IBM System/34 Maintenance Manual page 434

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~
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C
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To
A·B3U4
Coupler Adapter
SH
SG
DA
CCT
OH
RI
DT
DR
Through D·B8
Cable Tower
Opening
Switch Hook
Signal Ground
Data Modem Ready
Coupler Cut Through
Off Hook
Ring Indicate
Data Tip
Data Ring
External Cable to
CBS or, Equivalent
Data Coupler
DA OH DT
(yellow) (blue) (white)
Figure 30-18. (Part 2 of
4).
4800 BPS Integrated Modem-Switched Network (Modem A) (Canada Only)
30-405
Multiline Communications Adapter 25
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