Second-Generation Channel Interface Processor (CIP2) Installation and Configuration 27
What Is the CIP2
Bus and Tag Cables
Following are descriptions and illustrations of the bus and tag cables.
Y Cable
The bus and tag cable with three 78-pin connectors (shown in Figure 14 on page 27) has a DB-78
male (PCA) connector on the CIP2 end, a DB-78 female connector on the next-control-unit end, and
a DB-78 male connector on the from-host end.
Figure 14 PCA Bus and Tag Cable (CAB-PCA-Y)
The model number is CAB-PCA-Y (referred to as the Y cable) The male connector might be labeled
IN and is typically black, but can also be a dark gray. The female connector might be labeled OUT
and is typically light gray. The female OUT cable is nearest to the select/bypass switch, which is
discussed on the following page. (The IBM part number is 89F8392; however, this is subject to
change.)
Caution The Y cable must connected directly to the PCA. Do not connect any other cables directly
to the PCA.
H2444
Male, DB-78 PCA connector
Female, DB-78 connector to
next control unit (light gray)
Male, DB-78 connector from
host (dark gray or black)
Male, DB-78
terminator block
