Xerox 92C - Manual (Page 66)

IPDS printing environment
5-4 System Overview Guide
Figure 5-3. Channel board and control unit
1. Printer
2. Printer control and video cable
3. Printer controller with channel interface board
4. Channel cable connector box
5. Channel cables
6. Host system
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.
Host Channel Unit (HCU)—channel-attached systems only
Your system may use a Host Channel Unit (HCU) for channel
connection to a host for IPDS printing.
The HCU handles all IPDS communications and handshaking
with PSF on the host when the system is receiving data over a
channel. It is not used when the system is printing data using
TCP/IP.