NAME

dh, dz − DH11/DHU11/DHV11 and DZ11/DZV11/DZQ11 asynchronous multiplexers dhdm − DM11-BB (modem controller for DH11)

DESCRIPTION

Each line attached to a DH11, DZ11, DZV11, or DZQ11 communications multiplexer behaves as described in tty (4).  Input and output for each line may independently be set to run at any of 16 speeds; see tty (4) for encoding.  For DZ11, DZV11 and DZQ11 lines, the output speed always equals the input speed.  The 200 speed and the two externally clocked speeds (exta, extb) are missing on the DZ11, DZV11 and DZQ11. The 50 speed and extb are not allowed on the DHU11 and DHV11. 

The DH11 and DHU11 have 16 lines, the DZ11 and DHV11 have 8 lines, and the DZV11 and DZQ11 have four lines.  The DHV11, DZV11 and DZQ11 are used only on Q bus processors. 

FILES

/dev/tty##

SEE ALSO

tty(4), getty(8)
ULTRIX-11 System Management Guide, Section 2.6 and Appendix A
ULTRIX-11 Software Technical Description