Unix	Unix v7
	dn(4)

DN

NAME

dn − DN-11 ACU interface

The dn? files are write-only. The permissible codes are:

	0-9		dial 0-9
	:		dial *
	;		dial #
	−		4 second delay for second dial tone
	<		end-of-number

The entire telephone number must be presented in a single write system call.

It is recommended that an end-of-number code be given even though not all ACU’s actually require it.

/dev/dn0 connected to 801 with dp0
/dev/dn1 not currently connected
/dev/dn2 not currently connected