CONTROLLER COMPONENTS AND OPTIONS
2-10 XEROX DOCUPRINT 4050/4090 IPS INSTALLATION PLANNING GUIDE
Host Channel Unit (HCU)—channel-attached systems only
The HCU handles all of the IPDS communications and handshaking
with PSF on the host when the IPS is receiving data over a channel.
(It is not used when the IPS is printing data using TCP/IP.) The
following figure illustrates the HCU component.
Figure 2-7. Host Channel Unit (HCU)
• The front panel of the HCU provides a single-digit LED display
which enables you to monitor power-up and offline status, and
alerts you to error conditions. (Refer to your IPS Messages
Guide for an explanation of the HCU codes displayed here.)
• The back panel of the HCU has a power switch and outlet,
S/370 bus and tag cable input and bypass connectors, and a
dual serial port. In addition, there are two switches on the back
panel to set channel printing to high or low. The power supply is
a standard switching power supply capable of 10 amps on the 5
volt output.
Note: The customer is responsible for obtaining, stringing, and
maintenance of the bus and tag cables. The bus and tag cables must
be fully populated cable sets.