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2-10 XEROX DOCUPRINT 96/4635/180 IPS INSTALLATION PLANNING GUIDE
Host Channel Unit—channel-attached systems only
The Host Channel Unit (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 the 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 priority 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.