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14 UnityOne Modular Fiber/Copper ZPHA Installation Guide V 2.1
Cross-over Cable Installation
You may need to use cross-over and straight cables depending on what two devices are being
connected to on a segment. You would use cross-over options typically is you are not connecting to an
Ethernet switch.
Internally, the ZPHA is a straight cable, whether in High Availability (HA) or normal mode. If you need
a cross-over to connect to the IPS, then you need a cross-over between the ZPHA and the IPS. In other
words, the cross-over must stay connected on the IPS side with an additional straight cable when the
ZPHA is added.
The following figures display alternate installations of the ZPHA when a cross-over is needed.
Whenever you have a cross-over connection coming in you must use a cross-over cable between the
ZPHA and the IPS and a straight cable from the ZPHA to the other device. See Figure 2 - 10, “
ZPHA
Cross-over Configuration 1:
Figure 2 - 10: ZPHA Cross-over Configuration 1