IBM 5500-01E, Operational, Installation, And Maintenance Manual

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Figure 59: Test Connector
2. Check for resistances shown in Figure 60.
Twinax Y Test
A twinax Y (P/N 8642550) is shown in Figure 61.
Note: All cabling system connectors are equipped with shorting bars that
function as the switches in the schematic. The contacts are open when the
connector is plugged in.
Figure 60: IMD or Direct-Connect Cable Check
Resistance Measurement
Measure Resistance
From Impedance Matching
Device
Direct Connect Cable
Phase A to green 18 to 22
W
< 1
W
Phase B to red 18 to 22
W
< 1
W
Phase A to B > 100 k
W
> 100 k
W
Phase A to shield > 100 k
W
> 100 k
W
Phase B to shield > 100 k
W
> 100 k
W
Twinax shield to
cabling system shield < 1
W
< 1
W
Red
Orange
Black Shield
Red
Green
Orange
Black
Green
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