Sun Microsystems 220R service manual Parallel Port Cables

C.1.8.2 Parallel Port

The parallel port is supported by an IEEE 1284-compatible parallel port controller that is located on the SuperIO component. The parallel port controller is a PC-industry-standard controller that achieves a 2-megabits per second (Mbps) data transfer rate. The parallel port controller interface supports the ECP protocol as well as the following:

Centronics – Provides a widely accepted parallel port interface.

Compatibility – Provides an asynchronous, byte-wide forward (host to peripheral)

4channel with data and status lines used according to their original definitions.

Nibble mode – Provides an asynchronous, reverse (peripheral-to-host) channel, under control of the host. Data bytes are transmitted as two sequential, 4-bit nibbles using four peripheral-to-host status lines.

Parallel Port Cables

The parallel port cable is IEEE1284 compliant and comprises 18 pairs of signal wires that are double shielded with braid and foil. The maximum length of the parallel port cable is 2.2 yards (2 meters).

262 Sun Enterprise 220R Server Service Manual ♦ January 2000, Revision A