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DN(4) Device Drivers Manual DN(4)

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

dp(4)

UNIX-7