Xerox 180 IPS manual Host Channel Unit-channel-attached systems only, Host Channel Unit HCU

CONTROLLER COMPONENTS AND OPTIONS

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)

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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.

2-10 XEROX DOCUPRINT 96/4635/180 IPS INSTALLATION PLANNING GUIDE